JPH0520214A - Electronic disk subsystem - Google Patents

Abstract

PURPOSE:To provide an ecomonical disk subsystem having a function for detecting whether transfer is executed without missing the data or not at the time of executing writing operation from an electronic disk controller to an electronic disk device by means of simple constitution. CONSTITUTION:At the time of transferring data from the electronic disk controller 2 to the electronic disk device 3, a transfer counter 22 in the device 2 counts up the number of times of transfer, an adder 23 adds the counted value to the value of an address register 21, and an adding circuit 24 adds the added value to the end of data as a transfer end address. At the time of receiving the data by the disk device 3, an address counter 31 counts up the number of transfer addresses of the data and a comparator 32 compares the counted value with the transfer end address added to the end of the data to detect the data missing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic disk subsystem, and more particularly to an electronic disk subsystem having a function of detecting data loss.

[0002]

2. Description of the Related Art Some conventional electronic disk subsystems use the same electronic disk subsystem and have a function of detecting a failure during a write / read operation in a dual write system configuration. , Did not detect failure or missing data alone.

[0003]

The above-mentioned conventional electronic disk subsystem uses the electronic disk subsystem having the same configuration and has a function of detecting a failure during a write / read operation in a dual write system configuration. However, since the electronic disk subsystem does not function independently, there is a problem that the configuration is large and expensive.

An object of the present invention is an economical electronic disk having a simple structure and having a function of detecting whether or not data can be transferred without omission during a write operation from the electronic disk controller to the electronic disk device. To provide a subsystem.

[0005]

The electronic disk subsystem of the present invention is an electronic disk subsystem including an electronic disk controller and an electronic disk device, wherein the electronic disk controller is an address register for holding a transfer start address. , A transfer counter that counts the number of transfers, an adder circuit that adds the value of the address register and the value of the transfer counter to create a transfer end address, and a transfer end address that is created by the adder circuit at the end of transfer data. The electronic disk device has an additional circuit for adding and transferring, and the electronic disk device includes an address counter for counting a transfer address, and a comparing circuit for comparing a value of the address counter with a transfer end address added at the end of transfer data. A write operation from the electronic disk control device to the electronic disk device, The electronic disk control device adds the transfer end address to the end of the transfer data and transfers the transfer data to the electronic disk device, and the electronic disk device compares the transfer end address added at the end of the transfer with the value of the address counter. Thus, it is configured to detect whether or not data is lost in the transfer between the electronic disk control device and the electronic disk device.

[0006]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention.

The electronic disk subsystem 1 of the present invention is
The electronic disk control device 2 and the electronic disk device 3 are included. The electronic disk control device 2 includes an address register 21 that holds a transfer start address, a transfer counter 22 that counts the number of transfers, and an adder circuit that adds the value of the address register 21 and the value of the transfer counter 22 to create a transfer end address. The electronic disk device 3 has an address counter 31 that counts the transfer address of the transfer data to be received. And a comparison circuit 32 for comparing the value of the address counter 31 with the transfer end address added to the end of the transfer data. During the writing operation from the electronic disk controller 2 to the electronic disk device 3, the electronic disk controller 2 adds the transfer end address to the end of the transfer data and transfers the transfer data to the electronic disk device 3, and the electronic disk device 3 transfers the transfer data. End address and address counter 31 added at the end of the
Of the electronic disk control device 2
It is detected whether or not data is lost in the transfer between the electronic disk device 3 and the electronic disk device 3.

[0009]

As described above, according to the present invention, when data is transferred from the electronic disk control device to the electronic disk device, the electronic disk control device counts the number of transfers by the transfer counter and adds it to the value of the address register. Add in the circuit,
The data is added as the transfer end address to the end of the data by the addition circuit, and when the data is received by the electronic disk, the data transfer address is counted by the address counter and compared with the transfer end address added to the end of the data. By comparing with the circuit, it is possible to economically realize the function of detecting whether or not the data can be transferred without any data loss during the writing operation from the electronic disk control device to the electronic disk device with a simple configuration. There is.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

[Explanation of symbols]

 1 Electronic Disk Subsystem 2 Electronic Disk Controller 3 Electronic Disk Device 21 Address Register 22 Transfer Counter 23 Adder Circuit 24 Addition Circuit 31 Address Counter 32 Comparison Circuit

Claims (1)

1. An electronic disk subsystem including an electronic disk control device and an electronic disk device, wherein the electronic disk control device includes an address register for holding a transfer start address and a transfer for counting the number of transfers. A counter, an adder circuit that adds the value of the address register and the value of the transfer counter to create a transfer end address, and an adder circuit that adds and transfers the transfer end address created by the adder circuit to the end of the transfer data. The electronic disk device includes an address counter for counting transfer addresses, and a comparison circuit for comparing the value of the address counter with a transfer end address added to the end of transfer data. During the write operation from the control device to the electronic disk device, the electronic disk control device transfers the transfer data. The transfer end address is added to the end of the transfer to the electronic disk device, and the electronic disk device compares the transfer end address added at the end of the transfer with the value of the address counter, thereby the electronic disk control device And an electronic disk subsystem for detecting whether or not data is lost during transfer between the electronic disk device and the electronic disk device.