CN101887403B - Data transmission method and device for saving memory for storing packets in USB protocol - Google Patents

Abstract

A data transmission method for saving the memory used to store packet in universal serial bus protocol is characterized by that when the transmitting end wants to transmit data load, the protocol layer of transmitting end writes the data load into the shared data load memory. The protocol layer generates corresponding file head according to the data load, writes the corresponding file head into the shared file head memory, and the data link layer of the transmitting end directly combines the file head stored in the shared file head memory and the data load stored in the shared data load memory into a packet and transmits the packet. Therefore, when the sender intends to send the corresponding data payload, the sender only needs to have a memory space equal to the size of one packet to store the packet corresponding to the data payload. Thus, memory space can be saved to reduce cost.

Description

Data transmission method and device for saving memory for storing packets in USB protocol

technical field

The present invention relates to a data transmission method, more specifically, to a data transmission method capable of saving memory used for storing packets in the Universal Serial Bus (USB) protocol.

Background technique

Please refer to Figure 1. FIG. 1 is a schematic diagram illustrating the packet format of the USB 3.0 packet DP in the prior art. As shown in FIG. 1 , the packet DP includes a header H and a data payload P. The file header H includes type information TP, end point information (end point) EP, a link command word (link command word) LW, a file header error check code CRC _H , and a reserved area RA. The data payload P includes a data segment D and a data error checking code CRC _D .

The type information TP can be used to determine the packet type of the packet DP. The packet type, for example, can be handshake (handshake), data (data) . . . and so on. The endpoint information EP can be used to determine the transmission type of the packet DP. For example, in the USB protocol version 3.0, there are four transfer types: control transfer type, interrupt transfer type, bulk transfer type, and simultaneous Type transfer type (isochronous transfer type). Each transmission type is used to transmit data with different characteristics. For example, the simultaneous transmission type is used for real-time transfer, and can be applied to transmit voice and video data to avoid discontinuity or discontinuity in the transmitted voice or video. Desynchronization (delay). The link command character LW is used to indicate the status of the data link, and the link command character LW further includes a link command character error check code CRC _L and a header sequence parameter (Header Sequence Number) HSEQ. The link command character error check code CRC _L is used to judge whether there is an error in the link command character LW. The header sequence parameter HSEQ is used to judge whether there is any error in the packet sequence of the packet DP. The file head error check code CRC _H is used to judge whether the file head H has an error. The reserved area RA can be used to store user-defined data.

The data segment D provides data actually transmitted by the transmitting end, such as video data transmitted by the camera and data stored in the flash drive. The data error check code CRC _D is used to judge whether the data segment D has an error. In addition, the data segment D may include N pieces of data SD ₁ -SD _N .

In the prior art, during USB transmission, it can be divided into a transmitting end T and a receiving end R. The transmitter T can be a host or a device, and the receiver R can be a corresponding device or a corresponding host. The data processing of the transmitting end T and the receiving end R when transmitting packets is layered sequentially from the bottom into physical layer (physical layer) PH, data link layer (data link layer) DL and protocol layer (protocol layer) PR. The working principles of receiving the packet DP at the receiving end R and transmitting the packet DP at the transmitting end T are respectively described below.

When the receiving end R receives the packet DP, the receiving end R will store the packet DP in the data link memory DLM of the data link layer DL of the receiving end R. When the data link layer DL of the receiving end R judges that the header H of the packet DP is correct, the data link layer DL of the receiving end R will copy the packet DP stored in the data link memory DLM to the protocol layer PR of the receiving end R. Protocol memory PRM. In this way, the protocol layer PR of the receiving end R can perform subsequent processing on the packet DP stored in the protocol memory PRM.

When the transmitting end T needs to transmit the data payload P, the protocol layer PR of the transmitting end T will generate a header H according to the data payload P, and store it in the protocol memory PRM of the protocol layer PR of the transmitting end T according to the header H and the data payload P Generate packet DP. The transmitting end T copies the packet DP stored in the protocol memory PRM to the data link memory DLM of the data link layer DL of the transmitting end T. At this time, the protocol layer PRM of the transmitting end T will notify the data link layer DL of the transmitting end T to send the packet DP stored in the data link memory DLM.

Because in the prior art, both the protocol layer PR and the data link layer DL of the transmitting end T or the receiving end R need a memory to store packets (such as a protocol memory PRM and a data link memory DLM). That is to say, when receiving or transmitting the packet DP, the packet DP will occupy twice the size of the memory space of the packet DP at the receiving end R or the transmitting end T. In this way, unnecessary waste of memory is caused, which increases the cost and brings great inconvenience to users.

Contents of the invention

The invention provides a data transmission method which can save the memory used for storing packets in the universal serial bus protocol. The data transmission method includes a receiving end receiving a packet transmitted by a transmitting end, and storing the packet in a shared memory, a data link layer of the receiving end storing a header of the packet in the shared memory Perform error code check to obtain a data link check result, and transmit a protocol layer processing signal to a protocol layer of the receiving end, and the protocol layer of the receiving end processes the signal according to the protocol layer, directly to The packets stored in the shared memory are processed later.

The present invention also provides a data transmission method that can save the memory used to store packets in the Universal Serial Bus protocol. The data transmission method includes a protocol layer at a transmitting end writing a data payload into a shared data payload storage, the protocol layer at the transmitting end generating a file header according to the data payload, and writing the file header into a shared file header memory, and a data link layer at the transmitting end directly compose a packet with the file header stored in the shared header memory and the data payload stored in the shared data payload memory, and transmit the packet to a receiving end.

The present invention also provides a device that can save the memory used for storing packets in the Universal Serial Bus protocol. The device includes a transmitting device and a receiving device. The transmission device includes a shared header memory, a shared data payload memory, a first protocol layer device, and a first data link layer device. The first protocol layer device is used to generate a file header according to a data payload, store the data payload in the shared data payload memory, and store the file header in the shared file header memory. The first data link layer device is used for directly combining the file header stored in the shared header memory and the data payload stored in the shared data payload memory into a packet, and sending the packet. The receiving device is used for receiving the packet. The receiving device includes a shared memory, a second data link layer device, and a second protocol layer device. The shared memory is used to store the packet. The second data link layer device is used to check the error code of the header of the packet stored in the shared memory to generate a data link check result, and according to the data link check result , to send a data link reply signal to the transmitting device, and generate a protocol layer processing signal. The second protocol layer device is used to process the signal according to the protocol layer and an endpoint information of the header of the packet stored in the shared memory to determine that the packet stored in the shared memory is a simultaneous transmission type packet.

The present invention also provides a receiving device for saving memory. The receiving device receives a packet according to a communication protocol, and the packet includes a file header and a data payload. The receiving device includes a shared memory, a second data link layer device, and a second protocol layer device. The shared memory includes a plurality of packet storage units. A first packet storage unit of the plurality of packet storage units stores the packet and corresponds to a first memory address. The second data link layer device is electrically connected to the shared memory. The second data link layer device reads the packet stored in the first packet storage unit according to the first memory address. The second protocol layer device is electrically connected to the shared memory. The second protocol layer device reads the packet stored in the first packet storage unit according to the first memory address.

The present invention also provides a receiving device for saving memory. The receiving device receives a packet according to a communication protocol, and the packet includes a file header and a data payload. The receiving device includes a data link memory, a protocol memory, a second data link layer device, and a second protocol layer device. The data link memory includes a plurality of header storage units, a first header storage unit of the plurality of header storage units stores the header of the packet but does not store the data payload of the packet. The first head storage unit corresponds to a second memory address. The protocol memory includes a plurality of data payload storage units, and a first data payload storage unit of the plurality of data payload storage units stores the data payload of the packet but does not store the header of the packet. The first data load storage unit corresponds to a third memory address. The second data link layer device is electrically connected to the data link memory. The second data link layer device reads the header of the packet according to the second memory address. The second protocol layer device is electrically connected to the protocol memory. The second protocol layer device reads the data payload of the packet according to the third memory address.

The present invention also provides a transmission device that saves memory. The transmission device transmits a packet according to a communication protocol, and the packet includes a file header and a data payload. The transmission device includes a first protocol layer device, a shared header memory, a shared data payload memory, and a first data link layer device. The first protocol layer device is used for generating the header of the packet according to the data payload of the packet. The common file header memory is electrically connected to the first protocol layer device. The shared file header storage includes a plurality of shared file header storage units. A first shared header storage unit of the plurality of shared header storage units stores the header of the packet but does not store the data payload of the packet. The first shared header storage unit corresponds to a fourth memory address. The shared data payload memory is electrically connected to the first protocol layer device. The shared data payload memory includes a plurality of shared data payload storage units. A first shared data payload storage unit of the plurality of shared data payload storage units stores the data payload of the packet but does not store the header of the packet. The first shared data load storage unit corresponds to a fifth memory address. The first data link layer device is electrically connected to the shared data payload memory and the shared header memory. The first data link layer device composes the packet with the header and the data payload according to the fourth memory address and the fifth memory address and sends the packet to a receiving device corresponding to the transmitting device.

Description of drawings

FIG. 1 is a schematic diagram illustrating the packet format of the USB 3.0 packet in the prior art;

2 is a flow chart illustrating a data transmission method that can save memory used to store packets in the USB protocol according to the first embodiment of the present invention;

3 is a flow chart illustrating a data transmission method that can save memory used to store packets in the USB protocol according to a second embodiment of the present invention;

Fig. 4 is the schematic diagram of the device for illustrating the device of the present invention that can save the memory used to store packets in the USB protocol;

FIG. 5, FIG. 6 and FIG. 7 are schematic diagrams illustrating the header storage unit of the shared header memory that can be written when the confirmed pointer is greater than, smaller than, or equal to the pointer to be sent;

Fig. 8 is a schematic diagram of setting the pointer to be sent as the corresponding file header address after the protocol layer writes the file header to the file header storage unit;

FIG. 9, FIG. 10 and FIG. 11 are respectively schematic diagrams illustrating the data storage unit where the data link layer at the transmitting end needs to send the stored data when the pointer to be sent is greater than, smaller than, or equal to the sent pointer;

FIG. 12 is a schematic diagram illustrating another embodiment of the receiving device of the present invention.

Explanation of reference signs:

200, 300-method; 201-203, 301-305-step; 400-device; 410-transmission device; 411, 421, 521-data link layer device; 412, 422, 522-protocol layer device; 420, 520 -receiving device; ADDR _{H_(K-1)} , ADDR _{H_X} , ADDR _{H_Y} -file header address; CRC _H , CRC _D , CRC _L -error check code; DP-packet; D-data segment; DLM-data link EP-endpoint information; H-file header; HM ₁ ～HM _N -file header storage unit; HSEQ-file header sequence parameter; LW-link command character; P-data load; PLM ₁ ～PLM _N - Data payload storage unit; PRM-protocol memory; PTR _AA -acknowledged pointer; PTR _AS -sent pointer; PTR _WS -waiting to send pointer; RA-reserved area; S _ACK -handshake signal; S _DL -data link reply Signal; S _PRP - protocol layer processing signal; SD ₁ ~ SD _N - data; SHHM - shared file header memory; T - transmission end; TP - type information.

Detailed ways

In view of this, the present invention provides a data transmission method, both the protocol layer and the data link layer of the transmitting end or the receiving end can share the same memory to store the packets, so as to save the memory space required for storing the packets, thereby reducing the cost .

Please refer to Figure 2. FIG. 2 is a flow chart illustrating a data transmission method 200 that can save memory for storing packets in the USB protocol according to the first embodiment of the present invention. In the data transmission method 200, it is assumed that the receiving end R is a host or a device, and the transmitting end T is a device or a device corresponding to the receiving end R. The receiver R includes a physical layer PH, a data link layer DL, a protocol layer PR, and a shared memory SHM. The shared memory SHM is used to store data. The shared memory SHM includes packet storage units DPM ₁ -DPM _N and flags F ₁ -F _N . The packet storage units DPM ₁ -DPM _N are used to store packets. The labels F ₁ -F _N are respectively used to indicate whether data can be written into the packet storage units DPM ₁ -DPM _N. The steps of the data transmission method 200 are described as follows:

Step 201: the receiver R receives the packet DP sent by the transmitter T, and stores the packet DP in the shared memory SHM;

Step 202: The data link layer DL of the receiving end R performs an error code check on the header H of the packet DP stored in the shared memory SHM to obtain a data link check result E _DL , and transmit the protocol layer accordingly Process the signal S _PRP to the protocol layer PR of the receiver R;

Step 203: The protocol layer PR of the receiving end R directly performs subsequent processing on the packet DP stored in the shared memory SHM according to the protocol layer processing signal S _PRP .

In step 201, when the receiving end R receives the packet DP sent by the transmitting end T, the receiving end R will firstly find out the packet storage unit that can be written according to the labels F ₁ -F _N . For example, when the label F _K indicates "can be written", it means that the packet storage unit DPM _K of the shared memory SHM can be written into data; when the label F _K indicates "has been written", it means that The packet storage unit DPM _K of the time-shared memory SHM already has stored data, so data cannot be written in, so as not to overwrite the data originally stored in the packet storage unit DPM _K. Assume that the label F _K means "writable", so the receiving end R will write the packet DP and store it in the packet storage unit DPM _K of the shared memory SHM, and the receiving end R will mark the label F _K as "already be recorded".

In step 202, the data link layer DL of the receiving end R performs an error code check on the header H of the packet DP stored in the packet storage unit DPM _K in the shared memory SHM to obtain a data link check result E _DL . More specifically, the data link layer DL of the receiving end R judges whether the file header H of the packet DP is correct or not according to the link command character error check code CRC _L and the file header error check code CRC _H of the packet DP. The error check code CRC _H of the header H of the packet DP can be a 16-bit cyclic redundancy check code (Cyclic Redundancy Check 16, CRC-16), and the error check code CRC _L can be a 5-bit cycle Redundancy check code (CRC-5). The data link layer DL uses the error check codes CRC _H and CRC _L to perform cyclic redundancy check on the header H and the link command character LW of the packet DP respectively. For example, the overall cyclic redundancy check of the header H is to divide the header H (including the error check code CRC _H ) of the packet DP by a predetermined divisor CRC _DH to obtain a corresponding remainder CRC _RH . When the remainder CRC _RH is equal to a predetermined value X (for example, X is equal to zero), the verification result E _H indicates that the header H of the packet DP is correct; when the remainder CRC _RH is not equal to the predetermined value X, the verification result E _H Indicates that the header H of the packet DP is an error. The link command character verification result E _L can be obtained in a similar manner.

When one of the verification results E _L and E _H is wrong, the data link layer DL of the receiving end R judges that the file header H is wrong. At this time, the data link verification result E _DL indicates an error, and the data link layer DL of the receiving end R will send a retransmission signal S _LBAD to the transmitting end T to inform the transmitting end T that the packet DP transmitted by the receiving end R The data link check result E _DL of the data link indicates an error, so that the transmitting end T retransmits the packet DP. Conversely, when the verification results E _L and E _H are both correct, the data link layer DL at the receiving end R will determine that the file header H is correct. At this time, the data link verification result E _DL is correct, and the data link layer DL of the receiving end R will send an acknowledgment signal _SLGOOD to the transmitting end T to inform the sending end T that the packet DP transmitted by the receiving end R The data link check result E _DL is correct.

In addition, when the data link verification result E _DL is correct, the data link layer DL of the receiving end R sends the protocol layer processing signal S _PRP to the protocol layer PR of the receiving end R. The protocol layer processing signal S _PRP is used to indicate the packet address ADDR corresponding to the packet storage unit DPM _K of the shared memory SHM, so that the protocol layer PR can follow up the packet DP stored in the packet storage unit DPM _K in the shared memory SHM deal with.

In step 203, set the packet address ADDR indicated by the protocol layer processing signal _SPRP transmitted by the data link layer DL to represent "K", so the protocol layer PR can read according to the packet address ADDR representing "K". The data stored in the packet storage unit DPM _K of the shared memory SHM corresponding to the packet address ADDR is retrieved. That is to say, the protocol layer PR of the receiving end R can read the packet DP stored in the packet storage unit DPM _K. In this way, the protocol layer PR of the receiving end R can receive the data payload P of the packet DP for subsequent processing according to the endpoint information EP of the header H of the packet DP.

Furthermore, the protocol layer PR of the receiving end R judges whether the packet DP is a simultaneous transmission type packet according to the endpoint information EP of the header H of the packet DP.

When the endpoint information EP indicates that the packet DP is a simultaneous transmission type packet, the protocol layer PR of the receiving end R directly receives the data payload P of the packet DP for subsequent processing. For example, the data payload P is voice data transmitted from the transmitting terminal T to the receiving terminal R, so the receiving terminal R can directly receive the data payload P of the packet DP to play the voice according to the voice data of the data payload P.

When the endpoint information EP indicates that the packet DP is not a simultaneous transmission type packet, the protocol layer PR of the receiving end R performs a cyclic redundancy check on the data payload error check code CRC _D of the data payload P of the packet DP to obtain the data payload Check the result E _PL , and send the handshake (ACK) packet S _ACK to the transmitting end T accordingly. The data load error check code CRC _D may be a 32-bit cyclic redundancy check code (CRC-32). The protocol layer PL of the receiving end R uses the data load error check code CRC _D to perform a cyclic redundancy check to obtain the data load check result E _PL , and its working principle is the same as that of the aforementioned data link layer DL using the error check code CRC _H and CRC _L The header H of the CRC L packet DP performs the cyclic redundancy check in a similar way to the link command character LW, so it will not be described again. When the data load check result E _PL obtained according to the data load error check code CRC _D is correct, the protocol layer PR of the receiving end R will send a handshake signal S _ACK to the transmitting end T, wherein the handshake signal S _ACK includes The header sequence parameter HSEQ of the packet DP, so that the transmitting end T can judge that the handshake signal S _ACK corresponds to the packet DP according to the header sequence parameter HSEQ, and at this time the handshaking signal S _ACK is used to inform the transmitting end T The data payload check result E _PL corresponding to the packet DP in the receiving end R is correct (that is, the receiving end R has correctly received the packet DP). Conversely, when the data load check result E _PL obtained according to the data load error check code CRC _D indicates an error, the handshake signal S _ACK transmitted by the protocol layer PR of the receiving end R will inform the transmitting end T of The data payload check result E _PL corresponding to the packet DP in the receiving end R indicates an error. In this way, the transmitting end T can know that the packet DP corresponding to the header sequence parameter HSEQ has not been correctly received by the receiving end R according to the header sequence parameter HSEQ. Therefore, the transmitter T will retransmit the packet DP again.

According to the foregoing description, in the data transmission method 200 of the present invention, when the receiving end R receives the packet DP, the packet DP is stored in a packet storage unit of the shared memory SHM. That is to say, when the receiving end R receives the packet DP, the receiving end R only needs a memory space equivalent to the size of one packet (such as the packet storage unit DPM _K ) to store the packet DP. In this way, the memory space required for storing the packets can be saved, thereby reducing the cost.

In addition, another embodiment can be derived according to the basic spirit of the data transmission method 200 . In another embodiment, each packet storage unit DPM ₁ -DPM _N in the aforementioned shared memory SHM can be divided into two main parts, the first part is used to store the file header, and the second part is used to store the data payload. Further explanation will be given below.

The shared memory SHM includes a data link memory DLM and a protocol memory PRM. The data link memory DLM includes header storage units HM ₁ -HM _N . The gear head storage units HM ₁ -HM _N are used to store gear heads. The file header storage units HM ₁ ˜HM _N respectively contain common file header labels F _H1 ˜F _HN . The common header labels F _H1 ˜ F _HN are respectively used to indicate whether data can be written into the header storage units HM ₁ ˜HM _N. The protocol memory PRM includes data payload storage units PLM ₁ -PLM _N . The data load storage units PLM ₁ -PLM _N are used for storing data loads. The data payload storage units PLM ₁ ˜PLM _N respectively include common data payload labels F _PL1 ˜F _PLN . The shared data load labels F _PL1 -F _PLN are respectively used to indicate whether the data load storage units PLM ₁ -PLM _N can be written into.

Similar to step 201, when the receiving end R receives the packet DP transmitted by the transmitting end T, the receiving end R will first find out the file header storage unit that can be written according to the common file header labels F _H1 ˜F _HN , and According to the shared data load labels F _PL1 ˜F _PLN , the writable data load storage units are found. For example, when the common file header label F _HK indicates "can be written", it means that data can be written into the file header storage unit HM _K of the data link memory DLM at this time; when the common file header label F _HK indicates " When "has been written", it means that the header storage unit HM _K of the data link memory DLM has stored data at this time, so the data cannot be written in again, so as not to overwrite the data originally stored in the header storage unit HM _K. A similar method can be used to find the writable data load storage unit according to the shared data load labels F _PL1 ˜F _PLN , so details are not repeated here.

Assume that the common file header label F _HK and the shared data load label F _PLK both indicate "writable", so the receiving end R will write the file header H of the packet DP and store it in the file header of the data link memory DLM The storage unit HM _K writes and stores the data payload P of the packet DP into the data payload storage unit PLM _K of the protocol memory PRM, and the receiving end R marks both the common file header label F _HK and the common data payload label F _PLK as "Written".

Similar to step 202, the data link layer DL of the receiving end R performs an error code check on the header H of the packet DP stored in the header storage unit HM _K in the data link memory DLM to obtain the data link calibration Test result E _DL . More specifically, the data link layer DL of the receiving end R judges whether the file header H of the packet DP is correct or not according to the link command character error check code CRC _L and the file header error check code CRC _H of the packet DP. The data link layer DL uses the error check codes CRC _H and CRC _L to perform cyclic redundancy check on the header H and the link command character LW of the packet DP respectively, so as to obtain check results E _H and E _L respectively. Its working principle is the same as the foregoing description, so it will not be repeated.

When one of the verification results E _L and E _H is wrong, the data link layer DL of the receiving end R judges that the file header H is wrong. At this time, the data link verification result E _DL indicates an error, and the data link layer DL of the receiving end R will send a retransmission signal S _LBAD to the transmitting end T to inform the transmitting end T that the packet DP transmitted by the receiving end R The data link check result E _DL of the data link indicates an error, so that the transmitting end T retransmits the packet DP. Conversely, when the verification results E _L and E _H are both correct, the data link layer DL at the receiving end R will determine that the file header H is correct. At this time, the data link verification result E _DL is correct, and the data link layer DL of the receiving end R will send an acknowledgment signal _SLGOOD to the transmitting end T to inform the sending end T that the packet DP transmitted by the receiving end R The data link check result E _DL is correct.

In addition, when the data link verification result E _DL is correct, the data link layer DL of the receiving end R sends the protocol layer processing signal S _PRP to the protocol layer PR of the receiving end R. The protocol layer processing signal S _PRP is used to indicate the header address ADDR _H corresponding to the header storage unit HM _K of the data link memory DLM and the data payload address ADDR _PL of the data payload storage unit PLM _K of the protocol memory PRM.

Similar to step 203, the protocol layer PR can process the header address ADDR _H and the data load address ADDR _PL indicated by the signal S _PRP according to the protocol layer transmitted by the data link layer DL, so as to respectively read and store in the data link The header H of the packet DP stored in the header storage unit HM _K of the memory DLM, and the data payload P of the packet DP stored in the data payload storage unit PLM _K of the protocol memory PRM. Therefore, the protocol layer PR can compose the packet DP with the header H and the data payload P, and judge whether the packet DP is a simultaneous transmission type packet according to the endpoint information EP of the header H of the packet DP, and perform subsequent processing on the packet DP . The subsequent processing method is similar to the foregoing description, so it will not be repeated here.

Therefore, in this embodiment, when the receiving end R receives the packet DP, the header H of the packet DP is stored in a header storage unit of the data link memory DLM, and the data load P of the packet DP is stored in the protocol memory A data load storage unit of the DLM. That is to say, when the receiving end R receives the packet DP, the receiving end R only needs a memory space equivalent to the size of one packet (such as the header storage unit HM _K plus the data load storage unit PLM _K ) to store the packet DP. In this way, the memory space required for storing the packets can be saved, thereby reducing the cost.

Please refer to Figure 3. FIG. 3 is a flow chart illustrating a data transmission method 300 that can save memory for storing packets in the USB protocol according to a second embodiment of the present invention. In the data transmission method 300 , it is assumed that the transmitting end T may be a host end or a device end, and the receiving end R is a device end corresponding to the transmitting end T or a master end. The transmitting end T includes a physical layer PH, a data link layer DL, a protocol layer PR, a shared header memory SHHM, and a shared data payload memory SHPM. The shared data payload memory SHPM includes data payload storage units PLM ₁ ˜PLM _N and shared data payload labels F _PL1 ˜F _PLN . The data load storage units PLM ₁ -PLM _N are used for storing data loads. The shared data load labels F _PL1 -F _PLN are respectively used to indicate whether the data load storage units PLM ₁ -PLM _N can be written into. For example, when the shared data load label F _PLK indicates "can be written", it means that data can be written into the data load storage unit PLM _K of the shared data load memory SHPM at this time; when the shared data load label F _PLK indicates " When "has been written", it means that the data load storage unit PLM _K of the shared data load memory SHPM has stored data at this time, so the data cannot be written any more to avoid overwriting the data originally stored in the data load storage unit PLM _K . The shared header memory SHHM includes header storage units HM ₁ ˜HM _N , a pointer to send PTR _WS , a pointer to sent PTR _AS , and an acknowledged pointer PTR _AA . The gear head storage units HM ₁ -HM _N are used to store gear heads. The to-be-sent pointer PTR _WS is used to indicate that among the header storage units HM ₁ -HM _N , the data stored in the transmitting end T is required to be transmitted to the header storage unit R of the receiving end. The sent pointer PTR _AS is used to indicate that among the header storage units HM ₁ -HM _N , the transmitting end T has transmitted the stored data to the header storage unit of the receiving end R. The confirmed pointer PTR _AA is used to indicate that in the file header storage units HM ₁ ~ HM _N , the transmitting terminal T has transmitted the stored data to the receiving terminal R, and the transmitting terminal T has also received the data transmitted by the receiving terminal R The corresponding header storage unit represents the correctly received handshake signal S _ACK . The steps of the data transmission method 300 are described as follows:

Step 301: The protocol layer PR of the transmitter T writes the data payload P into the shared data payload memory SHPM;

Step 302: The protocol layer PR of the transmitting end T generates a file header H according to the data load P, and writes the file header H into the shared file header memory SHHM;

Step 303: The data link layer DL at the transmitting end T directly forms a packet DP from the header H stored in the shared header memory SHHM and the data payload P stored in the shared data payload memory SHPM, and sends the packet DP to Receiver R;

Step 304: The data link layer DL of the transmitting end T determines whether to retransmit the packet DP according to the data link reply signal S _DL corresponding to the packet DP transmitted by the receiving end R;

Step 305: The protocol layer PR of the transmitter T performs subsequent processing according to the handshake signal S _ACK corresponding to the packet DP transmitted by the receiver R.

In step 301, when the transmitting end T intends to transmit the data payload P, the protocol layer PR of the transmitting end T finds the data payload storage unit that can be written according to the shared data payload labels F _PL1 ˜F _PLN . For example, assuming that the shared data payload label F _PLK indicates “writable”, the transmitter T will write the packet DP into the data payload storage unit PLM _K of the shared data payload memory SHPM, and the transmitter T T will mark the common data payload label F _PLK as "written".

In step 302, the protocol layer PR of the transmitter T generates a header H according to the data payload P and the data payload address information D _{ADDR_PL} corresponding to the data payload storage unit PLM _K. For example, when the data payload P is a control command that the transmitter T intends to transmit to the receiver R, the protocol layer PR sets the endpoint information EP of the header H to represent the control transmission type; when the data payload P is a control command for the transmitter T For voice or video data to be transmitted to the receiving end R, the protocol layer PR sets the endpoint information EP in the header H to represent the simultaneous transmission type. In addition to generating the information contained in the file header H specified in the USB protocol (such as the type information TP, the endpoint information EP, the link command character LW, the error check code CRC _L and CRC _H , and the file header sequence parameters), the protocol layer PR generates HSEQ, etc.), the protocol layer PR also writes data load address information D _{ADDR_PL} for indicating the data load address ADDR _{PL_K} of the data load storage unit PLM _K in the reserved area RA of the file header H.

The protocol layer PR of the transmitting end T finds the file header storage unit of the shared file header memory SHHM that can be written according to the pending pointer PTR _WS and the acknowledged pointer PTR _AA . FIG. 5 , FIG. 6 and FIG. 7 are schematic diagrams respectively illustrating the header storage unit of the shared header memory SHHM that can be written when the confirmed pointer PTR _AA is greater than, smaller than, or equal to the pending pointer PTR _WS . For example, assume that the pointer to be sent PTR _WS is the address ADDR _{H_ (K-1) of the file head storage unit HM (K} -1), and the confirmed pointer PTR _AA is the file of the file head storage unit HM _X Header address ADDR _{H_X} . In Figure 5, the head address ADDR _{H_X} is greater than the head ADDR _{H_(K-1)} , which means that the head storage units HM _K ~ HM _X can be written into data, while other storage units have stored data . In Fig. 6, the address ADDR _{H_X} of the file head is smaller than the address ADDR _{H_(K-1)} of the file head, which means that HM ₁ ~ HM _X and HM _K ~ HM _N can be written into data, while other storage units already have Store data. In FIG. 7 , the head address ADDR _{H_X} is equal to the head ADDR _{H_(K-1)} , which means that data can be written into HM ₁ ˜HM _N. Assumed in step 302, the pointer PTR _WS to be sent is the head address ADDR _{H_( K-1) of the head storage unit HM (} K-1) and the confirmed pointer PTR _AA is also equal to the head address ADDR _{H_( K-1)} , then the protocol layer PR can write the file header H into the file header storage unit HM _K , and after the protocol layer PR writes the file header H to the file header storage unit HM _K , the pointer PTR _WS to be sent will be set as The head address ADDR _{H_K} of the head storage unit HM _K (as shown in FIG. 8 ).

In step 303, the data link layer DL of _the transmitting end _T judges that among the header storage units HM ₁ -HM _N of the shared header memory SHHM, there is a need to send The data link layer DL of the terminal T transmits its stored data to the data storage unit. Fig. 9, Fig. 10 and Fig. 11 are schematic diagrams illustrating the data storage unit where the data link layer DL of the transmitting end T needs to send the stored data when the pointer to be sent PTR _WS is greater than, smaller than, or equal to the pointer PTR _AS that is sent . For example, assume that the address indicated by the pointer PTR _WS to be sent at this time is the address ADDR _{H_K} of the header storage unit HM _K , and the sent pointer PTR _ASS is the address ADDR of the header storage unit HM _{Y H_Y} . It can be seen from FIG. 9 that if the address ADDR _K of the file head is greater than the address ADDR _{H_Y} of the file head, it means that the transmitting end T needs to send the data corresponding to the file head stored in the file head storage unit HM _(Y+1) ~ HM _K packet. It can be seen from FIG. 10 that if the head address ADDR _{H_K} is smaller than the head address ADDR _{H_Y} , it means that the transmitting end T needs to send the corresponding head storage units HM _(Y+1) ~ HM _N and HM ₁ ~ HM _K Packets of stored file headers. It can be seen from FIG. 11 that if the header address ADDR _{H_K} is equal to the header address ADDR _{H_Y} , it means that the transmitting end T has no packets to send at present.

When the data link layer DL of the transmitting end T judges that the packet corresponding to the file header H stored in the file header storage unit HM _K needs to be sent according to the pointer to be sent PTR _WS and the sent pointer PTR _AS , the data link layer of the transmitting end T The road layer DL reads the header H stored in the header storage unit HM _K. The data link layer DL of the transmitting end T obtains the data payload address ADDR _{PL_K} stored in the data payload storage unit PLM _K of the shared data payload memory SHPM according to the data payload address information D _{ADDR_PL} of the reserved area RA of the file header H. In this way, the data link layer DL of the transmitting end T can read the data payload P stored in the data payload storage unit PLM _K according to the data payload address ADDR _{PL_K} , and compose the data payload P and the file header H into a packet DP, to send the packet DP to the receiving end R.

In step 304, when the data link reply signal S _DL transmitted by the receiving end R is a retransmission signal S _LBAD , the data link layer DL of the transmitting end T can adjust the _sent Pointer PTR _AS to make the data link layer DL retransmit the packet DP. Further explanation will be given below.

Since the data link layer DL of the transmitting end T judges that in the header storage units HM ₁ -HM _N , data has been transmitted but not yet received by the receiving end R according to the confirmed pointer PTR _AA and the sent pointer PTR _AS . The transmitted header storage unit represents the correctly received handshake signal S _ACK . For example, assume that the address indicated by the confirmed pointer PTR _AA is the address ADDR _{H_Z} of the file header storage unit HM _Z , and the address indicated by the sent pointer PTR _AS is the file header of the file header storage unit HM _K Address ADDR _{H_K} . If the file header address ADDR _{H_K} is greater than the file header address ADDR _{H_Z} , it means that the transmitting end T has sent the packet corresponding to the file header stored in the file header storage units HM _Z ~ HM _K , but has not yet received the packet sent by the receiving end R represents the correctly received handshake signal S _ACK ; if the head address ADDR _{H_K} is less than the head address ADDR _{H_Z} , it means that the transmitting end T has sent the corresponding head storage units HM _Z ~ HM _N and HM ₁ ~ HM _K stores the header packet, but has not yet received the header storage unit representing the correctly received handshake signal S _ACK sent by the receiving end R; if the header address ADDR _{H_K} is equal to the header address ADDR _{H_Z} , It means that the handshake signal S _ACK sent by the receiving end R representing correct reception has been received for the packets corresponding to the sending end T.

Assuming in step 304, it has been confirmed that the address indicated by the pointer PTR _AA is the head address ADDR _{H_ (K-1) of the file head storage unit HM (} K-1), and the bit indicated by the pointer PTR _AS has been sent The address is the head address ADDR _{H_K} of the head storage unit HM _K. At this time, if the data link reply signal S _DL is the retransmission signal S _LBAD , it means that the retransmission signal S _LBAD corresponds to the packet DP of the file header H stored in the file header storage unit HM _K , so the data link layer DL can set the sent pointer PTR _AS as the acknowledged pointer PTR _AA (that is, the header address ADDR _{H_(K-1)} ). In this way, as described above (in step 303), when the data link layer DL judges the file header storage units HM ₁ -HM in the shared file header memory SHHM according to the pointer to be sent PTR _WS and the pointer PTR _AS to be sent Among _N , when the data link layer DL needs to send the data storage unit of its stored data, because the pointer PTR _WS to be sent is still the file head address ADDR _{H_K} at this moment, the sent pointer PTR _AS has been reset to the file The header address is ADDR _{H_(K−1)} , so the data link layer DL resends the packet DP in a manner similar to that described in step 303 .

In step 305, since the handshake signal S _ACK contains information about the header sequence parameter HSEQ corresponding to the packet DP, the protocol layer PR can first judge according to the header sequence parameter HSEQ indicated by the handshake signal S _ACK The handshake signal S _ACK corresponds to the packet DP.

When the protocol layer PR judges that the handshake signal S _ACK indicates that the packet DP has been received correctly, the protocol layer PR can adjust the acknowledged pointer PTR _AA to release the header storage unit for storing the header H of the packet DP. For example, assume that the header H of the packet DP is stored in the header storage unit HM _K of the shared header memory SHHM, so the protocol layer PR will set the confirmed pointer PTR _AA as the header location of the header storage unit HM _K address ADDR _{H_K} to indicate that for the packet DP corresponding to the header H stored in the header storage unit HM _K , the transmitting end T has received the handshake signal S _ACK sent by the receiving end R representing correct reception. As can be seen from the description of step 302, the protocol layer PR judges whether the file header storage units HM ₁ -HM _N of the shared file header memory SHHM can be written according to the confirmed pointer PTR _AA and the pending pointer PTR _WS , so when the protocol When the layer PR sets the confirmed pointer PTR _AA as the file header address ADDR _{H_K} of the file header storage unit HM _K of the shared file header memory SHHM, it means that the protocol layer PR will judge that the file header storage unit HM _K can be written into data (meaning That is, the file header storage unit HM _K of the shared file header memory SHHM is released.

In addition, the protocol layer PR can obtain the data payload address ADDR _{PL_K} according to the data payload address information D _{ADDR_PL} of the file header H. In this way, the protocol layer PR can mark the shared data load label F _{PL_K} corresponding to the data load storage unit PLM _K of the shared data load memory SHPM as “writable” according to the data load address ADDR _{PL_K} to release the shared data Data load storage unit PLM _K of the load memory SHPM.

Therefore, it can be known from the foregoing description that when the protocol layer PR judges that the handshake signal S _ACK indicates that the packet DP has been received correctly, the protocol layer PR will adjust the acknowledged pointer PTR _AA and the shared data load memory SHPL to store the packet The shared data load label F _{PL_K} corresponding to the data load storage unit PLM _K of the data load P of the DP is used to release the file header storage unit HM _K and the shared data used to store the file header H of the packet DP in the shared file header memory SHHM The data payload storage unit PLM _K in the payload memory SHPM is used to store the data payload P of the packet DP.

When the protocol layer PR judges that the handshake signal S _ACK indicates that the packet DP has not been received correctly, the protocol layer PR adjusts the sent pointer PTR _AS according to the acknowledged pointer PTR _AA so that the data link layer DL of the transmitting end T to retransmit the packet DP. Its working principle is similar to that in step 304 when the data link reply signal S _DL received by the data link layer DL is the retransmission signal S _LBAD , so it will not be described again.

In addition, compared with the prior art, in the data transmission method 300 of the present invention, when the transmitting end T intends to transmit the packet DP corresponding to the data payload P, the header H of the packet DP is a file stored in the shared header memory SHHM. The header storage unit, and the data payload P of the packet DP is stored in a data payload storage unit of the shared data payload memory SHPM. That is to say, when the transmitting end T intends to transmit the corresponding packet DP, the transmitting end T only needs a memory equivalent to the size of a file header (such as the file header storage unit HM _K ) and a memory equivalent to the size of a data load ( For example, the data payload storage unit PLM _K ) to store the packet DP. In other words, when the transmitting end T intends to transmit the packet DP corresponding to the data payload P, the transmitting end T only needs to have a memory space equivalent to the size of one packet to store the packet DP. This saves memory space and reduces costs.

Please refer to Figure 4. FIG. 4 is a schematic diagram illustrating a device 400 for saving memory for storing packets in the USB protocol according to the present invention. The device 400 is used to transmit data. The device 400 includes a transmitting device 410 and a receiving device 420 . The transmitting device 510 is a transmitting end. The transmission device 410 includes a first data link layer device 411 , a first protocol layer device 412 , a shared header memory SHHM, and a shared data payload memory SHPM. The receiving device 420 is a receiving end. The receiving device 420 includes a second data link layer device 421 , a second protocol layer device 422 , and a shared memory SHM. The receiving device 420 and the transmitting device 410 of the device 400 are respectively derived according to the first embodiment and the second embodiment of the present invention.

When the transmission device 410 intends to send a data payload P, the first protocol layer device 412 writes the data payload P into the shared data payload memory SHPM, and the first protocol layer device 412 generates a file header H according to the data payload P, and writes the file The header H is written into the shared file header memory SHHM. Next, the first data link layer device 411 directly forms a packet DP from the header H stored in the shared header memory SHHM and the data payload P stored in the shared data payload memory SHPM, and sends the packet DP to the receiving device 420 .

When the receiving device 420 receives the packet DP, it will store the packet DP in the shared memory SHM. The second data link layer device 421 of the receiving device 420 performs an error code check on the file header H of the packet DP stored in the shared memory SHM to obtain a data link check result E _DL and generate a data link The reply signal S _DL is sent to the transmission device 410 , and the protocol layer processing signal S _PRP is sent to the second protocol layer device 422 . When the data link verification result E _DL indicates an error, the data link reply signal S _DL generated by the second data link layer device 421 is a retransmission signal S _LBAD , which is used to inform the transmission device 410 of the corresponding packet DP The data link check result E _DL indicates an error, so that the first data link layer device 411 of the transmission device 410 sends the packet DP accordingly. When the data link verification result E _DL is correct, the data link reply signal S _DL generated by the second data link layer device 421 is a confirmation signal S _LGOOD , which is used to inform the transmission device 410 of the data corresponding to the packet DP The link verification result E _DL is correct, and the second protocol layer device 412 directly performs subsequent processing on the packet DP stored in the shared memory SHM according to the protocol layer processing signal S _PRP . More specifically, when the second protocol layer device 412 receives the protocol layer processing signal _SPRP , the second protocol layer device 412 will judge whether the packet DP is a simultaneous transmission according to the endpoint information EP of the header H of the packet DP type packet. When the second protocol layer device 412 judged that the packet DP was a simultaneous type transmission type packet, it directly received the data load P of the packet DP; when the second protocol layer device 412 judged that the packet DP was not a simultaneous type transmission type packet, the packet DP The data load error check code CRC _D of the data load P performs a cyclic redundancy check to obtain the data load check result E _PL , and sends a handshake signal S _ACK to the transmission device 410 accordingly, so that the transmission device 410 The first protocol layer device 412 performs subsequent processing accordingly.

In addition, the above-mentioned receiving device may also be implemented according to another embodiment of the data transmission method 200 . For example, the receiving device 520 according to another embodiment of the data transmission method 200 can be used to replace the above-mentioned receiving device 420 . Please refer to FIG. 12 , the receiving device 520 includes a data link memory DLM, a protocol memory PRM, a second data link layer device 521 , and a second protocol layer device 522 . The data link memory DLM includes header storage units HM ₁ -HM _N . The gear head storage units HM ₁ -HM _N are used to store gear heads. The file header storage units HM ₁ ˜HM _N respectively contain common file header labels F _H1 ˜F _HN . The common header labels F _H1 ˜ F _HN are respectively used to indicate whether data can be written into the header storage units HM ₁ ˜HM _N. The protocol memory PRM includes data payload storage units PLM ₁ -PLM _N . The data load storage units PLM ₁ -PLM _N are used for storing data loads. The data payload storage units PLM ₁ ˜PLM _N respectively include common data payload labels F _PL1 ˜F _PLN . The shared data load labels F _PL1 -F _PLN are respectively used to indicate whether the data load storage units PLM ₁ -PLM _N can be written into. In other words, the data link memory DLM is used to store the header of the packet but not the payload of the packet, and the protocol memory PRM is used to store the payload of the packet but not the header of the packet. The second data link layer device 521 is electrically connected to the data link memory DLM. The second protocol layer device 522 is electrically connected to the protocol memory PRM. The working principle of the data transmission between the receiving device 520 and the transmitting device 410 is similar to the working principle of the data transmission between the receiving device 420 and the transmitting device 410 , so it will not be repeated here.

To sum up, in the data transmission method provided by the present invention, when the receiving end receives the packet, it stores the packet in the shared memory, and the data link layer checks the header of the packet stored in the shared memory for an error code, To obtain the data link verification result, and transmit the protocol layer processing signal to the protocol layer accordingly. In this way, the protocol layer can process the signal according to the protocol layer, so as to directly perform subsequent processing on the packets stored in the shared memory. With the data transmission method of the present invention, when the receiving end receives a packet, the receiving end only needs a memory space equal to the size of the packet to store the packet. In addition, the present invention further provides a data transmission method. When the transmitting end intends to transmit the data payload, the protocol layer of the transmitting end writes the data payload into the shared data payload memory. The protocol layer generates the corresponding file header according to the data load, and writes the corresponding file header into the shared file header memory, and the data link layer at the transmitting end directly stores the file header stored in the shared file header memory and the shared data load memory. The data payload in it composes a packet and sends the packet. Using the data transmission method of the present invention, when the transmitting end wants to transmit the corresponding data payload, the transmitting end only needs to have a memory space equivalent to the size of a packet to store the packet corresponding to the data payload. In this way, memory space can be saved to reduce costs and bring greater convenience to users.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.

Claims (32)

1. the data transmission method that can save the storer that is used for storing package in the universal serial bus protocol is characterized in that, comprises following steps:

One receiving end receives the package that transmit a transmission end, and this package is stored in a shared storer;

One data link layer of this receiving end is carried out the error code verification to the one grade of head that is stored in this package in this shared storage, drawing a data link check results, and transmits a protocol layer according to this and handles the protocol layer that signal is given this receiving end; And

This protocol layer of this receiving end is handled signal according to this protocol layer, directly this package that is stored in this shared storage is carried out subsequent treatment, wherein,

This data link layer of this receiving end is carried out the error code verification to this grade head that is stored in this package in this shared storage, drawing this data link check results, and transmits this protocol layer according to this and handles this protocol layer that signal is given this receiving end, comprises:

One grade of error-checking code to this grade head of this package is carried out CRC, to draw one grade of check results;

Link command character error-checking code to this grade head of this package is carried out CRC, to draw a link command character check results; And

According to these shelves check results and this link command character check results, draw this data link check results; And

Represent when correct in this data link check results, transmit this protocol layer and handle this protocol layer that signal is given this receiving end, and transmit one and confirm that signal is to this transmission end;

Wherein this affirmation signal is to be used for informing that this package that transmits this transmission end representes correctly in this data link check results of this receiving end.

2. data transmission method according to claim 1; It is characterized in that; This data link layer of this receiving end is carried out the error code verification to this grade head that is stored in this package in this shared storage; Drawing this data link check results, and transmit this protocol layer according to this and handle signal and comprise for this protocol layer of this receiving end in addition:

When this data link check results is represented mistake, transmit one and heavily send signal to this transmission end;

Wherein this heavy signal that send is that this package that is used for notifying this transmission end to transmit is represented mistake in this data link check results of this receiving end.

3. data transmission method according to claim 2 is characterized in that, according to these shelves check results and this link command character check results, draws this data link check results and comprises:

When these shelves check results and this link command character check results are all when correct, this data link check results is represented correctly; And

When having one to be wrong in these shelves check results and this link command character check results, this data link check results is represented mistake.

4. data transmission method according to claim 1 is characterized in that, this protocol layer of this receiving end is handled signal according to this protocol layer, directly this package that is stored in this shared storage is carried out subsequent treatment, comprises:

Handle signal according to this protocol layer, to obtain an address of this shared storage;

According to this address of this shared storage, to read this package that is stored in this shared storage; And

According to a terminal point information of this grade head of this package, this data payload that receives this package is to carry out subsequent treatment.

5. data transmission method according to claim 4 is characterized in that, according to this terminal point information of this grade head of this package, this data payload that receives this package comprises to carry out subsequent treatment:

When this this package of terminal point information indication was simultaneous type transport-type package, this data payload that receives this package was to carry out subsequent treatment; And

This package is non-when being simultaneous type transport-type package when the indication of this terminal point information; Data payload error-checking code to this data payload of this stored package of this shared storage is carried out CRC; Draw a data payload check results, and send a friendship according to this and hold signal to this transmission end.

6. data transmission method according to claim 1 is characterized in that, this receiving end is to be a main control end or a device end, and this transmission end is to be a main control end or a device end corresponding to this receiving end.

7. the data transmission method that can save the storer that is used for storing package in the universal serial bus protocol is characterized in that, comprises following steps:

One protocol layer of one transmission end is written into a shared data payload storer with a data payload;

This protocol layer of this transmission end produces one grade of head according to this data payload, and this grade head is write a shared shelves storer; And

This grade head that one data link layer of this transmission end directly will be stored in this shared shelves storer is formed a package with this data payload that is stored in this shared data load memory, and this package is sent to a receiving end, wherein,

This protocol layer of this transmission end produces this grade head according to this data payload, and this grade head is write this shared shelves storer comprises:

Confirmed pointer according to a pointer to be sent and, to judge that this shared shelves storer is to be written into;

According to this data payload with corresponding to a data payload address information of this shared data load memory, producing this grade head, and this grade head is stored in this shared shelves storer; And

According to one grade of address, with this pointer to be sent of adjustment corresponding to this shared shelves storer;

Wherein this data payload address information corresponding to this shared data load memory is a data payload address that is used for indicating this shared data load memory.

8. data transmission method according to claim 7 is characterized in that, this protocol layer of this transmission end is written into this shared data load memory with this data payload and comprises:

According to a shared data payload label, this data payload is write this shared data load memory corresponding to this shared data load memory; And

Will be corresponding to this shared data load label of this shared data load memory, be labeled as and be written into.

9. data transmission method according to claim 7 is characterized in that, this data payload address information is a reserved area that is stored in this grade head.

10. data transmission method according to claim 7; It is characterized in that; This grade head that this data link layer of this transmission end will be stored in this shared shelves storer is formed this package with this data payload that is stored in this shared data load memory; And this package is sent to this receiving end, comprise:

This data link layer of this transmission end has been sent pointer according to this pointer to be sent and one, needs to send this package corresponding to stored this grade head of this shared shelves storer to judge;

This data link layer of this transmission end is according to this grade head, obtaining this data payload address information, and obtains being stored in this data payload of this shared data load memory according to this; And

This data link layer of this transmission end is formed this package with this grade head and this data payload, and is sent to this receiving end.

11. data transmission method according to claim 10 is characterized in that, this data transmission method comprises in addition:

This data link layer of this transmission end is replied signal according to the data link corresponding to this package that a receiving end is transmitted, to judge whether this package that will retransfer; And

This protocol layer of this transmission end is held signal according to handing over corresponding to one of this package that this receiving end transmitted, to carry out subsequent treatment.

12. data transmission method according to claim 11 is characterized in that, this data link layer of this transmission end is replied signal according to this data link corresponding to this package that this receiving end transmitted, and to judge whether this package that will retransfer, comprises:

Reply signal in this data link and attach most importance to when sending signal, this has sent pointer, this package so that this data link layer of this transmission end retransfers according to this to have confirmed the pointer adjustment according to this.

13. data transmission method according to claim 12 is characterized in that, replys signal in this data link and attaches most importance to when sending signal; Confirmed pointer according to this; Adjust this and sent pointer, this package so that this data link layer of this transmission end retransfers according to this comprises:

This data link layer of this transmission end has been sent pointer according to this pointer to be sent and this, needs to send this package corresponding to stored this grade head of this shared shelves storer to judge;

This data link layer of this transmission end is according to this grade head, obtaining this data payload address information, and obtains being stored in this data payload of this shared data load memory according to this; And

This data link layer of this transmission end is formed this package with this grade head and this data payload, and is sent to this receiving end.

14. data transmission method according to claim 11 is characterized in that, this protocol layer of this transmission end is held signal according to this friendship corresponding to this package that this receiving end transmitted, and to carry out subsequent treatment, comprises:

When this friendship is held this package of signal indication and has correctly been received; According to this friendship hold signal with adjust this confirmed pointer with corresponding to this shared data load label of this shared data load memory, should a shared grade of storer and this shared data load memory to discharge; And

When this friendship was held this package of signal indication and correctly do not received, this had sent pointer, this package so that this data link layer of this transmission end retransfers according to this to have confirmed the pointer adjustment according to this.

15. data transmission method according to claim 14; It is characterized in that; When this friendship is held this package of signal indication and has correctly been received; According to this friendship hold signal with adjust this confirmed pointer with corresponding to this shared data load label of this shared data load memory, should a shared grade of storer and this shared data load memory to discharge, comprise:

Hold one grade of stored in signal sequence parameter according to this friendship, with this grade address that obtains this shared shelves storer and this grade head that is stored in this shared shelves storer;

According to this data payload address information of this grade head, to obtain this data payload address of this shared data load memory;

According to these shelves address of this shared shelves storer, confirmed pointer to adjust this, discharge this shared shelves storer; And

According to this data payload address,, discharge this shared data load memory being labeled as and being written into corresponding to this shared data load label of shared data load memory.

16. data transmission method according to claim 14; It is characterized in that when this friendship was held this package of signal indication and correctly do not received, this had sent pointer to have confirmed the pointer adjustment according to this; This package so that this data link layer of this transmission end retransfers according to this comprises:

This data link layer of this transmission end has been sent pointer according to this pointer to be sent and this, needs to send this package corresponding to stored this grade head of this shared shelves storer to judge;

This data link layer of this transmission end is according to this grade head, obtaining this data payload address information, and obtains being stored in this data payload of this shared data load memory according to this; And

This data link layer of this transmission end is formed this package with this grade head and this data payload, and is sent to this receiving end.

17. data transmission method according to claim 16 is characterized in that, this transmission end is to be a main control end or a device end, and this receiving end is to be a main control end or a device end corresponding to this transmission end.

18. the device that can save the storer that is used for storing package in the universal serial bus protocol is characterized in that, comprises:

One conveyer, it comprises:

An one shared shelves storer;

One shared data payload storer;

One first protocol layer device is used for according to a data payload, producing one grade of head, and stores this data payload in this shared data load memory, and stores this grade head in this shared shelves storer; And

One first data link bed device, this grade head that is used for directly will being stored in this shared shelves storer is formed a package with this data payload that is stored in this shared data load memory, and sends this package; And

One receiving trap is used for receiving this package, and this receiving trap comprises:

One shared storer is used for storing this package;

One second data link bed device; Be used for this grade head that is stored in this package in this shared storage is carried out the error code verification; To produce a data link check results; And, reply signal to this conveyer, and produce protocol layer processing signal to transmit a data link according to this data link check results; And

One second protocol layer device is used for according to the terminal point information of this protocol layer processing signal with this grade head of this package that is stored in this shared storage, and whether this package that is stored in this shared storage with judgement is simultaneous type transport-type package, wherein,

When this data link check results was represented mistake, it was to attach most importance to sending signal so that this of this conveyer first data link layer is heavily given this package that this data link is replied signal; When this data link check results is represented when correct, it is for confirming that signal and this second data link device transmit this protocol layer and handle signal to this second protocol layer device that this data link is replied signal.

19. device according to claim 18 is characterized in that, when this second protocol layer device judges that this package is simultaneous type transport-type package, directly receives this data payload of this package; When this second protocol layer device is judged that this package is non-and is simultaneous type transport-type package; Data payload error-checking code to this data payload of this package is carried out CRC; Draw a data payload check results; And send a friendship according to this and hold signal to this conveyer, so that this of this conveyer first protocol layer is made subsequent treatment.

20. a receiving trap of saving storer, this receiving trap receives a package according to a universal serial bus protocol, and this package comprises one a grade of head and a data payload, it is characterized in that, this receiving trap comprises:

One shared storer comprises the plurality of packets storage element, the corresponding first memory address of one first this package of package storage unit stores of this plurality of packets storage element and this first package storage element;

One second data link bed device is electrically connected at this shared storage, and this second data link bed device reads this package that is stored in this first package storage element according to this first memory address; And

One second protocol layer device is electrically connected at this shared storage, and this second protocol layer device reads this package that is stored in this first package storage element according to this first memory address.

21. receiving trap according to claim 20 is characterized in that, this first package storage element comprises one first label and is used for indicating this first package storage element whether can be written into data.

22. receiving trap according to claim 20; It is characterized in that; This second data link bed device carries out the error code verification producing a data link check results according to this grade head of this package, and transmits a data link according to this data link check results and reply the pairing conveyer of signal to this receiving trap.

23. receiving trap according to claim 22; It is characterized in that; This second data link bed device is according to this data link check results; Optionally produce a protocol layer and handle signal to this second protocol layer device, this second protocol layer device is received this protocol layer and is handled behind signal the terminal point information according to this grade head of this package, and whether this package that is stored in this shared storage with judgement is simultaneous type transport-type package.

24. receiving trap according to claim 23 is characterized in that, this protocol layer is handled signal and is comprised this first memory address, makes this second protocol layer device read this package that is stored in this first package storage element according to this first memory address.

25. a receiving trap of saving storer, this receiving trap receives a package according to a universal serial bus protocol, and this package comprises one a grade of head and a data payload, it is characterized in that, this receiving trap comprises:

One data link storer; Comprise a plurality of shelves storage element; This grade head of one first grade of this package of storage unit stores of these a plurality of shelves storage elements and do not store this data payload of this package and the corresponding second memory address of this first grade of storage element;

One protocol memories; Comprise plurality of data load storage element; This data payload of one first this package of data payload storage unit stores of this plurality of data load storage element and do not store this grade head of this package, and corresponding one the 3rd storer address of this first data payload storage element;

One second data link bed device is electrically connected at this data link storer, and this second data link bed device reads this grade head of this package according to this second memory address; And

One second protocol layer device is electrically connected at this protocol memories, and this second protocol layer device reads this data payload of this package according to the 3rd storer address.

26. receiving trap according to claim 25; It is characterized in that; This first grade of storage element comprises one second label and is used for indicating this first grade of storage element whether can be written into data, is used for indicating this first data payload storage element whether can be written into data and this first data payload unit comprises one the 3rd label.

27. receiving trap according to claim 25; It is characterized in that; This second data link bed device carries out the error code verification producing a data link check results according to this grade head of this package, and transmits a data link according to this data link check results and reply the pairing conveyer of signal to this receiving trap.

28. receiving trap according to claim 27; It is characterized in that; This second data link bed device is according to this data link check results; Optionally produce a protocol layer and handle signal to this second protocol layer device, this second protocol layer device is received this protocol layer and is handled behind signal the terminal point information according to this grade head of this package, is simultaneous type transport-type package to judge this package.

29. receiving trap according to claim 28; It is characterized in that; This protocol layer is handled signal and is comprised this second memory address, makes this second protocol layer device read this grade head of this package that is stored in this first grade of storage element according to this second memory address.

30. receiving trap according to claim 28; It is characterized in that; This protocol layer is handled signal and is comprised the 3rd storer address; Wherein when this second protocol layer device judged that this package is simultaneous type transport-type package, this second protocol layer device directly read this data payload of this package that is stored in this first data payload storage element and a data payload error-checking code of this data payload is not carried out CRC according to the 3rd storer address; When this second protocol layer device is judged that this package is non-and is simultaneous type transport-type package; This second protocol layer device reads this data payload of this package that is stored in this first data payload storage element and this data payload error-checking code of this data payload is carried out CRC according to the 3rd storer address; Draw a data payload check results; And send a friendship according to this and hold signal to this conveyer, so that one first protocol layer of this conveyer is made subsequent treatment.

31. a conveyer of saving storer, this conveyer transmits a package according to a universal serial bus protocol, and this package comprises one a grade of head and a data payload, it is characterized in that, this conveyer comprises:

One first protocol layer device is used for this data payload according to this package to produce this grade head of this package;

An one shared shelves storer; Be electrically connected at this first protocol layer device; This shared shelves storer comprises a plurality of shared shelves storage element; This grade head of one first shared shelves this package of storage unit stores of these a plurality of shared shelves storage elements and do not store this data payload of this package and corresponding one the 4th storer address of this first shared shelves storage element;

One shared data payload storer; Be electrically connected at this first protocol layer device; This shared data load memory comprises a plurality of shared data load storage elements; This data payload of one first this package of shared data load storage unit stores of these a plurality of shared data load storage elements and do not store this grade head of this package, and corresponding one the 5th storer address of this first shared data load storage element; And

One first data link bed device; Be electrically connected at this shared data load memory and this shared shelves storer, this first data link bed device is formed this grade head and this data payload this package and is sent the pairing receiving trap of this package to this conveyer according to the 4th storer address and the 5th storer address.

32. conveyer according to claim 31 is characterized in that, this first shared data load storage element comprises one the 4th label and is used for indicating this first shared data load storage element whether can be written into data.

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