JPS593573A - Magnetic disk controller - Google Patents

Abstract

PURPOSE:To prevent the deterioration of system performance, by storing previously and each time the error information on the detected data, and producing the data error correction information when the reading of all data is through. CONSTITUTION:A magnetic disk processor 120 receives an indication of a CPU and then drives a data transfer circuit 111 to transfer the read-out data given through a line 200 to a main storage device via a line 201. This data is also stored in a storage circuit 112 and an error detecting circuit 113 respectively. If an error of data is detected when the reading of a block is over, the processor 120 stores the error data to an error information storing circuit 114 from the circuit 113. When all data are read out of a magnetic disk device by the indication given from the CPU, the processor 120 extracts successively the stored error data out of the circuit 114 to produce the error correction information. Then the read-out data stored in the circuit 112 is corrected by the error correction information and then transferred to the main storage device via the line 201 after the circuit 111 is driven through a line 204.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Description of the technical field to which the invention pertains The present invention relates to a magnetic disk control device, and particularly to an error correction control system for data read from a magnetic disk device.

(2) Description of Prior Art Conventionally, this type of data error correction control system, as shown in FIG. When a data error is detected by reading the data section outside the data block consisting of section 11, at that point, correction information for the data error is created and stored in the storage circuit in the magnetic disk controller. The existing data was corrected and retransferred to main storage. If data blocks n and R+i are processed with one instruction from a medium heat processing device, if there is a data error in the data section of the data block, the data section outside the data block will be read. By the way, in order to create correction information for data errors, correct the data in the storage circuit, and retransfer it to the main storage device, it is not possible to continue processing +1 outside the data block, resulting in a rotation loss. [One rotation of the Qi disk is 16 rna
~2oWLa, so that time cannot be ignored.

Furthermore, since access to the main storage device occurs every time a data error is detected, this becomes a factor that leads to a decrease in system performance.

(3) Detailed description of the invention The present invention has been made in view of the above-mentioned conventional circumstances.
Therefore, an object of the present invention is to accumulate error information of detected data errors each time, and create correction information of data errors when all data reading from a magnetic disk device is completed. To provide a new magnetic disk control device which eliminates the above-mentioned drawbacks, performs data error 90 correction without rotation loss, and makes it possible to avoid system performance deterioration by accessing the main storage only once. be.

(4) Detailed Description of the Invention In order to achieve the above object, the magnetic disk control device of the present invention includes a data transfer circuit that transfers data read from a magnetic disk device to a main storage device, and a memory that stores the read data. a circuit, an error detection circuit that detects an error in read data when reading of one data block is completed, an error information storage circuit that stores error information when an error is detected, and instructions from a central processing unit. When reading of all data from the magnetic disk device is completed, error information is sequentially retrieved from the error information storage circuit to create error correction information from the MB information, and this is used to read data stored in the storage circuit. and a magnetic disk processing device that corrects data and drives the data transfer circuit to transfer the corrected data to the main storage device again.

(5)' Detailed Description of the Invention Next, one preferred embodiment of the present invention will be described in detail with reference to the following.

In FIG. 2 showing an embodiment of the present invention, a magnetic disk control device 1t100 of the present invention is composed of a magnetic disk control adapter 110 and a magnetic disk processing device 120, and the magnetic disk control adapter 110 further includes a data transfer Circuit 111, memory circuit 112, error detection circuit 1
13 and an error information storage circuit 114.

When the magnetic disk processing unit 120 receives an instruction from the central processing unit (not shown) through the line 202, it drives the data transfer circuit 111 through the line 204 to transmit data from the magnetic disk unit (not shown) through the entire line 200. The read data thus obtained is transferred to a main memory device t (not shown) through a line 201, and the read data is input to a storage circuit 112 and an error detection circuit 113. If an error is detected in the data when reading of one data block is completed, the magnetic disk processing unit @ 120
Error detection circuit 113 receives an error signal from error detection circuit 113 through line 206 and sends an accumulation instruction signal to error information storage circuit 114 through line 208.
The error information is accumulated from the error information storage circuit 114 through a line 207.

Then, the next data block is sequentially read from the magnetic disk device, and when all the data read from the magnetic disk device according to the instruction from the central processing unit is completed, the magnetic disk processing device fil 120 detects the erroneous block. The pulse information stored in the information storage circuit 114 is transferred to the line 209.
The information is sequentially retrieved through the system, and error correction information is created. Subsequently, the magnetic disk processing device 120 corrects the read data stored in the storage circuit 112 with the correction information sent through the line 205 and sends it to the data transfer circuit 1 through the wire 204.
11 to send the corrected read data from the storage circuit 112 to the data transfer circuit 111 through the line 203,
The data is transferred to main memory through line 201.

The present invention has been described above with respect to one preferred embodiment thereof, but
They are merely illustrative, and the present invention is not limited solely to the embodiments described herein.
It includes various modifications and changes.

(6) Detailed Description of the Invention As explained above, the present invention includes a method for correcting data errors by means of a magnetic disk control device having a storage circuit, an error detection circuit, and an error correction information storage circuit. This has the effect that it can be done without wasting time.

[Brief explanation of drawings]

FIG. 1 shows the format of a data block. FIG. 2 is a block diagram showing an embodiment of the present invention. 100, magnetic disk control device, 110. , , m-disk control adapter, 111. ,,data transfer circuit,
11200. Memory circuit, 113. , Error detection circuit, 1
14. ,,Error information storage circuit, 1.20. ,, Magnetic disk processing device patent applicant NEC Corporation Representative Patent attorney Yutabe Kumagai

Claims (1)

[Claims] In a b11 disk control device that is connected to a main storage device and a central processing unit, operates according to instructions from the central processing unit, and reads data from a magnetic disk device and transfers it to the main storage device, read data is transferred to the main storage device. a data transfer circuit that transfers data to a storage device; a storage circuit that stores read data; and an error detection circuit that detects an error in bladder ejection data when reading of one data block is completed;
An erroneous information storage circuit that accumulates erroneous information when an erroneous error is detected, and an erroneous 9 information storage circuit that accumulates erroneous information when all data has been output from the magnetic disk device according to instructions from the central processing unit. Sequentially extracting error information from the circuit, creating vAυ correction information from the error υ information, correcting read data stored in the storage circuit using the error correction information, and driving the data transfer circuit. and a magnetic disk processing device n that transfers the corrected data to the main storage device rt again.