JPH0354703A - Self diagnostic system for data recording and reproducing device - Google Patents

Abstract

PURPOSE:To inspect a write circuit or a read circuit, etc., by a self diagnostic function provided in an internal part even without using a tester or a host device by providing the first and second circuits to select data according to the instruction of a read / write control circuit, data storing circuit and the third selecting circuit to select the data of the write circuit or storing circuit. CONSTITUTION:When the read / write control circuit writes the test data through the first selector circuit 10 into the storing circuit 9, the test data stored in the storing circuit 9 are added through the third selecting circuit 12 to the read circuit 6. The read / write control circuit tests the read circuit 6 by confirming the test data in the storing circuit 9. The write circuit 5 converts the test data to a prescribed format and adds the data to the read circuit 6 and the read circuit 6 reversely converts the data and stores the data into the storing circuit 9 again. The write circuit 5 is tested by confirming the test data in the storing circuit 9. Thus, a data recording and reproducing device 1 can be diagnosed even without the exclusive tester or host device.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a self-diagnosis method for data recording and reproducing devices such as magnetic disk devices and magnetic tape devices. (Prior Art) It is necessary to inspect the functionality of data recording and reproducing devices at the time of manufacture or for maintenance purposes. In such cases, test the data recording and reproducing device by connecting it to a host device (such as a computer) that controls the data recording and reproducing device, or by connecting the data recording and reproducing device to a dedicated tester. Ta. Figure 2 shows an example of the configuration when a data recording/reproducing device is connected to a host device and the data recording/reproducing device is inspected. First, CPtJ3 of data recording and reproducing device 1j20
puts the transceiver receiver 4 into receiver mode (that is, the mode for receiving data from the host device). Then, the data sent by the host device 2 is sent to the write circuit 5 via the transceiver receiver 4. light circuit 5
The head 7 converts this data into data in a predetermined format to be recorded on a medium (magnetic disk, magnetic tape, etc.) and sends it to the head. Head 7 transfers this converted data to medium 8.
Record it in . Conversely, when reproducing data recorded on medium 8, C
The PU 3 sets the transceiver receiver 4 to a transceiver mode (that is, a mode for sending data from the data recording/reproducing device 20 to the host device 2). Then, the data read from the medium 8 by the head 7 is read 1t times! Sent to 6. The read circuit 6 inversely converts this data and sends it to the host device 2 via the transceiver receiver 4. In this way, data recording and reproducing devices have traditionally been tested. <Problems to be Solved by the Invention> As mentioned above, conventional data recording and reproducing devices are not equipped with a self-diagnosis function for inspecting the read port and write circuit. Therefore, in order to test data recording and reproducing devices, a dedicated tester or host device was required. In this way, conventional data recording and reproducing devices had problems that needed to be solved. The present invention has been made in view of the above circumstances, and its purpose is to provide a data recording and reproducing device that can inspect write circuits, read circuits, etc. using internal self-diagnosis function without using a tester or host device. The objective is to provide a self-diagnosis method. (Means for Solving the Problems) In order to achieve the above object, the self-diagnosis method of the data recording/reproducing device of the present invention includes a write circuit that converts write data from an AL device such as a computer into a predetermined format. ,
A head that records data converted by the write circuit onto a medium, and a read that reversely converts data in a predetermined format read by the head to data in the original format before being converted by the write circuit. and a read/write control circuit that controls the write circuit and the read circuit, wherein either one of the data from the read/write control circuit or the data from the read circuit is provided. a first selection circuit that selects data according to instructions from the read/write control circuit; a storage circuit that stores data selected by the selection circuit; and a first selection circuit that is connected between the control device and the write circuit and that controls the frfJ. a second selection circuit that selects either data from the device or data selected by the first selection circuit according to instructions from the read/write control circuit; and a third selection circuit connected between the head and the third selection circuit for selecting any one of the data from the head, the data from the write circuit, or the data from the storage circuit. (Function) In the self-diagnosis method of the data recording and reproducing device of the present invention,
When testing the read circuit, the read/write control circuit writes test data into the memory circuit via the first selection circuit. Then, the test data stored in the memory circuit is applied to the read circuit via the third selection circuit.
The read circuit rewrites the test data that has been converted back into a predetermined format. Store it in the circuit. The read/write control circuit then tests the read circuit by checking the test data in the memory circuit. Furthermore, when testing the write circuit, the read/write control circuit writes test data to the storage circuit via the first selection circuit. Then, the test data stored in the memory circuit is applied to the write circuit via the second selection circuit. The write circuit converts the test data into a specified format and adds it to the read circuit. The read circuit reversely converts this test data and stores it in the memory circuit again. The read/write control circuit then tests the write circuit by checking the test data in the memory circuit, similar to the test of the read circuit. (Example) Next, an example of the present invention will be described in detail with reference to the drawings. Figure 1 is a block diagram of an example of the knee according to the present invention. In this figure, the same symbols as in Figure 2 indicate the same parts. 10.11.
12 is a selector (corresponding to selection means), and 9 is a FIFO (corresponding to a storage circuit) from which the first stored data is first retrieved. Next, the operation when the host device 2 performs normal reading or writing to the data recording/reproducing device 1 in the embodiment shown in FIG. 1 will be explained. First, C
PtJ13 connects transceiver receiver 4 to selector 12.
, the selector 11 selects the heads 7, respectively. When data from the host device 2 is to be recorded on the medium 8, the transceiver receiver 4 is set to receiver mode.
Then, data from the host device 2 is sent to the write circuit 5 via the transceiver receiver 4 and selector 12. The write circuit 5 converts this data into a predetermined format and applies it to the head 7. The head 7 records the converted data on the medium 8. Conversely, when reproducing data recorded on the medium 8 and sending it to the host device 2, the CPU 1
3 sets transceiver receiver 4 to transceiver mode. Then, the data read from the medium 8 by the Hevdo 7 is applied to the read circuit 6 via the selector 11. The read circuit 6 reversely converts the format of this data and sends it to the host device 2 via the transceiver receiver 4.
In this way, data is recorded on the medium 8 and the medium 8
The data recorded above will be played back. Next, the operation when diagnosing the read circuit 6 and write circuit 5 using the self-diagnosis function provided in the data recording/reproducing device 1 will be explained. Diagnosis is lead circuit 6
, write circuit 5 in this order. Note that at this time, in order to prevent unnecessary data from being sent to the host device 2, the transceiver receiver 4 is placed in receiver mode. First of all,
The CPU 13 explains the diagnosis of the lead circuit 6.
F I FO9 to selector 11, CP to selector 10
Let them each select UI 3. Next, the CPU 13 stores the test data of the read circuit 6 via the selector 10. After causing the selector 10 to select the read circuit 6, an instruction is issued to sequentially send out the test data stored in the FIFO 9. F who received this instruction
The IFO 9 sequentially takes out the internal data and applies it to the read circuit 6 via the selector 11. The lead circuit 6 is
This data is subjected to the same inverse conversion as when data was received from Hevdo 7, and is sent to FI via selector 10.
Store in FO9. This kind of operation is performed by the CPU 13.
Repeat until there is no more test data stored in IFO9. Therefore, the data stored in the FTPO 9 is data whose format has been converted by the read circuit 6. next,
The CPU 13 retrieves the data stored in the PI FO 9. Then, the read circuit 6 can be diagnosed by determining whether the data conversion is being performed correctly. Next, diagnosis of the write circuit 5 will be explained.

The CPU 13 connects the FIFO9 to the selector 12, the write circuit 5 to the selector 11, and the CPU 13 to the selector 10.
Let them select each. Next, after storing the test data of the write time #15 in the FIFO 9, the selector 10 is caused to select the read circuit 6. It then instructs the data stored in FIFO 9 to be sent out sequentially. Upon receiving this instruction, the FIFO 9 sequentially takes out the internal data and applies it to the write circuit 5 via the selector 12. The write circuit 5 converts this test data into a predetermined format and applies it to the read circuit #I6 via the selector 11.
The read circuit 6 inversely converts the converted test data and stores it in the PIFO 9 via the selector 10. This operation is repeated until the test data stored in the FIFO 9 by the CPU 13 is exhausted. Therefore, the test data that has passed through the write circuit 5 and the read circuit 6 is stored in the FIFO 9. Next, the CPU 13
F I Retrieve the test data stored in FO9. The write circuit 5 can be diagnosed by determining whether the data is correct or not. At this time, since the function of the read circuit 6 has been confirmed, if there is an error in the test data, it can be determined that there is an abnormality in the write circuit 5. (Effects of the Invention) As explained above, according to the self-diagnosis circuit for the data recording/reproducing apparatus of the present invention, the data recording/reproducing apparatus can be diagnosed without a dedicated tester or host device. Also,
Since a tester or the like for diagnosis is not required, maintainability can be improved, and defects in the data recording and reproducing device can be detected early because the data recording and reproducing device always performs self-diagnosis. The reliability of the system used can be increased. Furthermore, since the read circuit and write circuit can be diagnosed separately, it is easy to analyze the cause of a failure.

[Brief explanation of drawings]

FIG. 1 is a top diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing a conventional testing method for a data recording/reproducing device. 1.20... Data recording/reproducing device, 2... Host device, 3.13... CPU, 4... Transceiver receiver, 5... Write circuit, 6... Read circuit, 7...
・Head, 8...Media, 9...FIFO, 10,1
1.12...Selector.

Claims (1)

[Claims] A write circuit that converts write data from a control device such as a computer into a predetermined format, a head that records the data converted by the write circuit on a medium, and a predetermined data read by the head. a read circuit that inversely converts data in the format into data in the original format before being converted by the write circuit; and a read/write control circuit that controls the write circuit and the read circuit. In the playback device, a first selection circuit that selects either data from the read/write control circuit or data from the read circuit according to instructions from the read/write control circuit; a memory circuit that stores data; and a memory circuit connected between the control device and the write circuit, the read/write device reading or writing either the data from the control device or the data selected by the first selection circuit. a second selection circuit that selects according to instructions from a control circuit; and a second selection circuit that is connected between the head and the read circuit and selects any one of the data from the head, the data from the write circuit, or the data from the storage circuit. 1. A self-diagnosis method for a data recording/reproducing device, characterized in that a third selection circuit for selecting one of the two is provided.