JPH04134538A - Microprogram controller - Google Patents

Abstract

PURPOSE:To correct read error without increasing the capacity of a control storage by exchanging a microprogram generating the error in the copy of the microprogram on a main storage device. CONSTITUTION:This device is equipped with a memory access means 10 connected to a main storage device 2 having the copy of the microprogram, control storage 11 to store the microprogram, and error detecting means 13 to detect the error of a data read out from this storage. When detecting the read error of a control data from the control storage during processing execution, the processing is interrupted. On the other hand, the data under the processing execution is saved, it is confirmed to the main storage device that the processing is not under a request, the copy of the control data on the main storage device 2 is read out and stored in the control storage 11, the error is corrected, the data under saving is recovered and the processing is started again from the interrupted point. Thus, the read error can be corrected without increasing the quantity of a hardware.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to means for handling successive errors in a control storage of a microprogram control device.

〔overview〕

The present invention provides means for processing successive errors in the control storage of a microprogram control device, by replacing a microprogram in which an error has occurred with a copy of the microprogram on the main storage device, without causing an increase in the capacity of the control storage. In addition, it is possible to repair repeated errors.

[Conventional technology]

Conventionally, in this type of microprogram control device, when a read error in the control storage occurs, the error is corrected using a correction code provided for each word, and processing continues.

FIG. 2 shows the configuration of a conventional microprogram control device. a control storage 31 that stores microprograms and correction codes, and a control storage 31
an address register 32 for storing the address of the control storage 31, and a correction means 35 for successive data in the control storage 31;
A selector 33 that selects any of the 0 correction data, a control storage register 34 that stores the output of the selector 33, and a control storage register 3.
4, and a correction means 35 for detecting an error using a data correction code and outputting correction data.

Control storage 31 to address register 32
The microprogram and correction data of the word indicated by are read out. Selector 33 is control storage 3
The successive data of 1 is selected and set in the control storage register 34. Using the microprogram data set in the control storage register 34 and the correction code data in the control storage register 34, the correction means 35 checks whether or not there is a continuous error in the control storage register 34. If there is an error, corrected data is created and output. The selector 33 selects the correction data of the correction means 350 and sets it in the control storage register 34.

By having the correction data corresponding to the words of the microprogram in this way, the execution of the microprogram can be continued while successive errors in the control storage 31 are corrected by the correction code.

[Problem to be solved by the invention]

Since such conventional microprogram control devices correct errors using only error detection codes, the number of code bits is large, which increases the capacity of control storage. In addition, the amount of hardware required for correction is large (Information Processing Society of Japan, April 1982 issue Vo, 23
(Refer to No. 4 Application of error detection/correction codes) There are drawbacks.

SUMMARY OF THE INVENTION The present invention aims to eliminate such drawbacks and to provide a microprogram control device that can correct successive errors without increasing the capacity of control storage or the amount of hardware for correction. do.

[Means to solve the problem]

The present invention provides a memory access means connected to a main storage device having a copy of a microprogram and accessed by the microprogram control device, a control storage storing the microprogram, and detecting errors in data read from the control storage. a microprogram control device comprising: error detection means for generating an address of a copy of the microprogram on the main storage device based on the address of data detected as an error by the error detection means; Address control means including means for reading the microprogram on the main memory using the address and storing it in the control storage, and a scratch pad memory in which control information necessary for restarting processing is saved and recovered. It is characterized by: Here, the memory requesting display means is provided for displaying that the microprogram control device is in the process of requesting memory, and the address control means is configured to display the microprogram control device in a state in which the error detection means detects an error. It is desirable to include means for reading the microprogram in the main memory and correcting the microprogram in the control storage when the microprogram is not in the middle of a memory request.

[Effect]

If an error in reading control data from the control storage is detected during processing, the processing will be interrupted, and
Save the data that is being processed.

Confirm that no requests are being made to the main storage,
A copy of the control data in main memory is read and stored in control storage to correct the error, while the data being saved is recovered and processing resumes from the point of interruption.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of this embodiment. In this embodiment, the microprogram control device 1
and a main storage device 2 which stores microprogram data 20, which is a copy of the microprogram, and which can be accessed by the microprogram control device 1.
Here, the microprogram control device 1 includes a memory access means 10 for accessing data in the main storage device 2;
A control storage 11 that stores a microprogram, a continuous register 12 that stores read data from the control storage 11, and a continuous register 12
an error detection means 13 for detecting an error in the data read out; an address generation means 14 for generating an address of the control storage 11 in response to an error detection notification from the error detection means 13; an error address register 15 that stores the error address register 15; a general register group 16 that is a plurality of general registers necessary for microprogram control;
Reply data in the main storage device 2 is controlled by a calculation means 17 for calculating data necessary for microprogram control, a scratch pad memory 18 for storing data necessary for microprogram control, and a memory access means 10 using microprogram instructions. It also includes a memory reply register 19 for storing. Here, memory access means 1
0 includes a memory request display means 101 for displaying whether or not a memo IJ quest is in progress that can be referenced by the microprogram.

That is, this embodiment includes a memory access means 10 connected to a main storage device 2 having a copy of the microprogram and accessed by the microprogram control device 1, a control storage 11 storing the microprogram, and the control storage 11. Error detection means 13 detects an error in the data read from the data stored in the main storage device 2 based on the address of the data detected by the error detection means 13 as a feature of the present invention. Address generation, which is an address control means including means for generating an address for a copy of the microprogram, and means for reading the microprogram on the main storage device 2 using the address generated by this means and storing it in the control storage. means 14 and error address register 15; a scratch pad memory 18 in which control information necessary for restarting processing is saved and recovered; and memory requesting display means 101 for indicating that the microprogram control device 1 is requesting memory. and the address control means is in a state where the error detection means 13 detects an error, and
It includes means for reading the microprogram on the main storage device 2 and correcting the microprogram in the control storage 11 when the microprogram control device 1 is not making a memory request.

Next, the operation of this embodiment will be explained.

When a processing request is issued to the microprogram control device 1, the address generation means 14 generates an address for the control storage 11. control storage 1
Control data is read from 1 to successive register 12, and controls general register group 16, arithmetic means 17, and memory access means 10 to execute processing. When the error detection means 13 detects a successive error in the successive register 12 during execution of processing, it notifies the address generation means 14. When the address generation means 14 receives the notification of the read error, it stops the execution of the microprogram. At the same time, the address of the word in which successive errors have occurred is stored in the error address register 15. The address generation means 14 generates an address for control storage error processing and executes the error processing. The microprogram for control storage error processing is general register group 16.
and the data of the memory reply register 19 are saved in the scratch pad memory 18. Memory access means I
If a request is in progress with reference to the memory request display means 101 in O, the memory is saved in the scratch pad memory 18 via the general register group 16 after a reply to the memory request is returned. The arithmetic means 17 calculates the address of the microprogram data 20 in the main memory 20 from the contents of the error address register 15. The memory access means 10 is activated and the main storage device 2 is accessed. When a reply to the request is returned, the reply data is set in the memory reply register 19. The address generating means 14 generates the address of the word where the repeated error has occurred, and writes the reply data into the control storage 11.

The data of the general register group 16 and the memory reply register 19 saved in the scratch pad memory 18 are recovered to be in the state when successive errors occur. The address generating means 14 continues processing from the address where the read error has occurred.

〔Effect of the invention〕

As explained above, the present invention has the effect of reducing the capacity of the control storage and also reducing the dedicated hardware for correction.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a block diagram showing the configuration of a conventional example. DESCRIPTION OF SYMBOLS 1... Microprogram control device, 2... Main storage device, 10... Memory access means, 11.31...
・Control storage, 12... successive registers,
13... Error detection means, 14... Address generation means, 15... Error address register, 16... General register group, 17... Arithmetic means, 18...
Scratch pad memory, 19...Memory reply register, 101...Memory request display means,
32...Address register, 33...Selector, 3
4... Control storage register (CS register), 35... Correction means.

Claims (1)

[Claims] 1. A memory access means connected to a main storage device having a copy of the microprogram and accessed by the microprogram control device, a control storage storing the microprogram, and data read from the control storage. and an error detection means for detecting an error in the microprogram control device, the means for generating an address of a copy of the microprogram on the main storage device based on the address of the data in which the error detection means detects an error, and this means. an address control means including means for reading the microprogram on the main memory using the address generated by the above and storing it in the control storage; and a scratch pad in which control information necessary for restarting processing is saved and recovered. A microprogram control device characterized by comprising a memory. 2. Memory requesting display means for displaying that the microprogram control device is making a memory request, and the address control means detects when the error detection means detects an error, and when the microprogram control device 2. The microprogram control device according to claim 1, further comprising means for reading the microprogram in said main storage and correcting the microprogram in said control storage when a memory request is not in progress.