JP2002007319A - Method and device for transferring data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for transferring data, by which serial transfer can be performed without providing a dedicated interface. SOLUTION: A part of a video I/F 1 is connected with a serial I/F 3 and serial transfer is performed between the both.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a data transfer method and apparatus, and more particularly to a data transfer method and apparatus for performing serial data transfer without using a dedicated interface.

[0002]

2. Description of the Related Art In recent years, in an apparatus such as a copying machine or a facsimile, an image reading section and an image forming section are configured as a single apparatus, and each is an independent CPU (Central Pr.).
processing unit). For example, images are transferred between the devices using a video I / F (interface) as in an "image processing device" described in Japanese Patent Application Laid-Open No. 5-244412.

On the other hand, in an apparatus using a processor such as a CPU, a program is stored in a non-volatile memory, and the non-volatile memory is rewritten when a bug of the program is corrected or a version is upgraded.

[0004] The rewriting of the program can be performed, for example, by using an "electronic system device incorporating a one-chip microcomputer" described in JP-A-8-227359 or JP-A-10-177.
This is performed by taking in data from outside the device by serial transfer, as in the “electronic control device” described in JP-A-504-504.

[0005]

The devices and the like composed of a plurality of devices as described above have independent CPUs, that is, operate according to independent programs. Therefore, it is necessary to rewrite the program for each device, and it is necessary to provide a function for serial transfer and a dedicated interface to each device.

However, providing a function for performing serial transfer and a dedicated interface to each device causes an increase in component costs and causes physical restrictions such as a harness.

It is an object of the present invention to provide a data transfer method and apparatus capable of performing serial transfer without providing a dedicated interface.

[0008]

According to a first aspect of the present invention, there is provided a data transfer method for an apparatus having an interface for simultaneously transferring a plurality of bits of data. Is used to perform serial transfer of data.

According to a second aspect of the present invention, in the first aspect, the serial transfer uses one of a plurality of data lines of the interface for serial transfer of data. Features.

A third aspect of the present invention is characterized in that, in the first aspect of the present invention, the interface is a video interface for transferring an image.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the interface is a video interface for transferring an image, and the download program for the device, which is input from a serial interface, is stored in the memory. The transfer is performed using any one of a plurality of data lines included in the video interface.

According to a fifth aspect of the present invention, there is provided a data transfer device in an apparatus having an interface for simultaneously transferring a plurality of bits of data, comprising a data extracting means for extracting a part of data received by the interface. Then, serial transfer is performed based on the data extracted by the data extracting means.

According to a sixth aspect of the present invention, in the fifth aspect of the invention, the data extracting means extracts any one of a plurality of bits received by the interface.

According to a seventh aspect of the present invention, in the fifth aspect of the present invention, the interface is a video interface for transferring an image.

According to an eighth aspect of the present invention, in the fifth aspect of the present invention, the interface is a video interface for transferring an image, and the download program for the device, which is input from a serial interface, is stored in the memory. The transmission is performed using one bit of the video interface.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a data transfer method and apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a diagram showing a configuration example of an interface of a data transfer device according to the present invention.

In this data transfer device, as shown in FIG. 1A, a synchronous serial I / F3 is connected to a video I / F1 on the receiving side in parallel with a video I / F2 on the transmitting side. The connection of the synchronous serial I / F3 is made by the clock (CL
K) In addition to connecting the signal line, the data (DATA) signal line is connected to the bit 0 signal line among the data signal lines of the video I / F1. The data signal line of the synchronous serial I / F3 may be connected to a data signal line other than the bit 0 of the video I / F1.

When the synchronous serial I / F 3 is connected to the video I / F 1, the two may be connected using a video I / F terminal, but as shown in FIG. , And the terminal 20 for the video I / F2 and the terminal 30 for the synchronous serial I / F3. In any case, when the synchronous serial I / F 3 is connected, unused signal lines are set to have high impedance.

In this configuration, when transferring image data and the like between the video I / F1 and the video I / F2,
As shown in FIG. 2A, n-bit data transfer is performed using all signal lines. The data of each bit is
The data is transferred in synchronization with the video clock (CLK).

On the other hand, the video I / F 1 and the synchronous serial I / F
Serial transfer of a program or the like between F3 is performed using a clock signal line and a 0-bit data signal line. In this case, data transferred by the 0-bit data signal line is performed in synchronization with a clock signal generated on the synchronous serial I / F 3 side.

Next, an example of execution of serial transfer using this configuration will be described. For example, a CPU is provided on the video I / F1 side.
11 and RAM (Random Access Memory)
ry) 12, Flash ROM (flash memory)
13 is connected.

The CPU 11 operates based on a program stored in the flash ROM 13 and, during serial transfer, extracts only the 0th bit data of the received n-bit data and receives it as data by serial transfer. I do.

When rewriting the program stored in the flash ROM 13, the CPU 11 receives the data of the 0th bit received by serial transfer, sequentially stores the data in the RAM 12, and terminates the reception of all the data. , And transfers the download program stored in the FlashROM 13 to the RAM 12. When the transfer is completed, the CPU 11 executes the download program transferred to the RAM 12, reads data from the RAM 12, and writes the data to the Flash ROM 13.

When a plurality of devices are connected by a video I / F, a synchronous serial I / F is connected to only one device, and data is serially transferred via the video I / F. Can be.

[0026]

As described above, according to the present invention, since a part of the video I / F is used as the serial I / F, there is no need to provide an interface dedicated to serial transfer. The size and cost of the device can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration example of an interface of a data transfer device.

FIG. 2 is a diagram for explaining a signal flow during data transfer.

FIG. 3 is a diagram for explaining an execution example of serial transfer.

[Explanation of symbols]

 Reference Signs List 1 video I / F 2 video I / F 3 synchronous serial I / F 11 CPU 12 RAM 13 Flash ROM 20 terminals 30 terminals

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akio Arai 3-7-1, Funai, Iwatsuki-shi, Saitama F-term in the Fuji Xerox Co., Ltd. Iwatsuki Office (reference) 2C061 AP03 AP04 HJ08 HQ20 HS07 5B077 AA01 FF11 GG16 HH02 NN02 5C062 AB41 AB43 AB44 AB47 AC43 BA01 5K034 AA20 CC03 HH05 JJ03 KK04

Claims (8)

[Claims] 1. A data transfer method in an apparatus having an interface for simultaneously transferring a plurality of bits of data, wherein data is serially transferred using a part of the interface. 2. The data transfer method according to claim 1, wherein said serial transfer uses one of a plurality of data lines of said interface for serial transfer of data. 3. The data transfer method according to claim 1, wherein said interface is a video interface for transferring an image. 4. The interface is a video interface for transferring an image, and includes a download program for the device input from a serial interface, the data interface having one of a plurality of data lines included in the video interface. 2. The data transfer method according to claim 1, wherein the transfer is performed using one. 5. A data transfer device in an apparatus having an interface for simultaneously transferring a plurality of bits of data, comprising: data extracting means for extracting a part of data received by the interface; A data transfer device for performing serial transfer based on extracted data. 6. The data transfer device according to claim 5, wherein said data extracting means extracts any one of a plurality of bits received by said interface. 7. The data transfer device according to claim 5, wherein the interface is a video interface for transferring an image. 8. The interface is a video interface for transferring an image, and transfers a download program for the device input from a serial interface using one bit of the video interface. The data transfer device according to claim 5, wherein: