JPS58181150A - Information processing device - Google Patents

Abstract

PURPOSE:To improve the reliability and the maintainability of a control storage, by providing an error detecting and correcting means, a counting means, and a controlling means for suppressing the generation of an error report signal which are used when an error is detected in read data from the control storage. CONSTITUTION:It is discriminated by an error detecting and correcting part 4 whether read data 9 from a control storage part 3 has an error or not. If a recoverable error is detected as the result, a recoverable error detection signal 13 is transmitted to perform the control so that an operation controlling part 6 is not operated with uncorrected data 9 during error correction. The signal 13 is used a count-up signal of a counting part 7 also to generate a one-error signal 15 and a 256-error signal 14; and when the error report is not suppressed, a controlling part 8 reports the occurrence of the recoverable error to a maintaining and diagnostic device 2. Simultaneously, instructions are stopped in the controlling part 6 by a hold signal 16. When the signal 14 is generated, the generation of following error report signals 17 is suppressed by the controlling part 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information processing apparatus having a function of automatically correcting errors in data read from control storage.

In information processing devices, a writable memory (hereinafter referred to as RAM) is used as a control memory for loading microprograms.

In general, compared to ROM, whose memory pattern is fixed during the manufacturing process, in the case of RAM, in which writing is performed each time, even if the microprogram is loaded in a state in which write operations can be executed normally, long-term read operations are not possible. Memory contents may be destroyed during repetition. Since errors in the control memory can cause a reduction in the efficiency of the entire machine, it is necessary to improve the reliability and maintainability of the control memory.

For this reason, conventionally, when reading a microinstruction from a control memory, an error correction means having functions of 1-bit error detection and correction and 2-bit error detection is employed.

Therefore, during normal operation, if a correctable error is detected, it can be corrected and operation can be continued using the corrected data.

In conventional information processing devices, when a correctable error is detected, corrected, and executed, at that point,
Stops instruction execution so that execution can be resumed from the next instruction, generates an error report signal, and notifies an external maintenance/diagnosis device of the correction of the correctable error. After collecting error log information regarding the corresponding address and bit position, the information processing device is instructed to restart the instruction.

In such conventional equipment, if a correctable error is a fixed failure, the correctable error will occur frequently, and the original performance of the equipment will be degraded because the error log information collection operation is performed each time. The disadvantage is that you will not be able to obtain it.

An object of the present invention is to provide an information processing device that eliminates the above-mentioned drawbacks.

The apparatus of the present invention is an information processing apparatus that stores a microprogram including a plurality of microinstructions in a control storage means and sequentially reads out the plurality of microinstructions to perform data processing. detection and correction means for detecting an error in the issued microinstruction and correcting the microinstruction if the error is a correctable error; a counting means for counting the number of times the error has been corrected; When the number of corrections reaches a predetermined number of times, an error report signal is generated, and when the number of corrections reaches a second predetermined number of times, the error report signal Qt is generated.
and control means for generating the error report signal again and suppressing subsequent generation of the error report signal.

Next, the present invention will be explained in detail with reference to the drawings.

The figure is a configuration diagram showing an embodiment of the present invention.

In the figure, the present embodiment detects an error in a control storage unit 3 that stores a microprogram including a plurality of microinstructions, and an error (hereinafter referred to as readout data) 9 read out from the control storage unit 3. an error detection and correction section 4 that automatically corrects the error detection and correction section 4; and switching that selects and outputs one of the read data 9 and the correction data 10 output from the error detection and correction section 4 when an error occurs under control of a correctable error detection signal 13; 5, and an arithmetic control section 6 that is controlled by microinstructions obtained from the output 11 of the switching section 5 and performs main operations and control of the entire device (address of the microinstruction to be read next by this arithmetic control section). 12 is also generated), a counter 7 which is incremented by 1 each time the error correction occurs under the control of the correctable error detection signal 13, and is output when the content of the counter 7 becomes 1. When the error detection signal 15 is inputted once, if the generation of the error report signal 17 is not suppressed, the error report signal 17 is generated and the arithmetic control unit 6 is activated so that it can be restarted from the next microinstruction to be executed. Error report signal 1 after the 256th error detection signal 14 is input, which is output when the hold signal 16 to stop is output to the control unit 6 and the content of the counting unit 7 reaches 256.
7. Generation 5 - Error report control unit 8 that suppresses generation and error report signal 1
When a correctable error detection is notified by 7, the address, bit position, etc. of the control storage unit 3 where the error occurred is collected from the arithmetic control unit 6 via the error log signal line 18, and held when error logging is completed. Release signal 20
The maintenance diagnosis instructs the error report control unit 8 to cancel the sending of the hold signal 16, and also instructs the arithmetic control unit 6 to resume instruction execution from the next microinstruction to be executed by the command 7f restart instruction signal 19. It consists of a device 2.

During normal operation of this device, read data 9 from control storage section 3 is given to arithmetic control section 6 via switching circuit 5 according to address 12 .

The error detection and correction section 4 determines whether or not there is an error in the read data 9, and when a correctable error is detected, sends a correctable error detection signal 13 reporting this to the switching section 5 and the control section 6. During error correction, the arithmetic control unit 6 is controlled not to operate with uncorrected data 9. Further, after the error 6-correction is completed, normal operation continues using the corrected data 10. Further, the correctable error detection signal 13 is also used as a count-up signal for the counting section 7, and 1 is added to the contents of the counting section 7 every time the correctable error detection signal 13 is generated. When the content of the counter 7 becomes 1, the error occurrence signal 15 is generated once, and the content of the counter 7 becomes 256.
When this happens, the error occurrence signal 14 is generated 256 times.

When the error occurrence signal 15 or the error occurrence signal 14 occurs 256 times, the error report control circuit 8 generates the error report signal 17 and sends a correctable error occurrence report to the maintenance diagnosis device 2, unless error reporting is suppressed. At the same time, hold signal No. 16 instructs the arithmetic control unit 6 to stop execution of the instruction so that execution can be resumed from the next microinstruction to be executed. 2
When the error occurrence signal 14 is generated 56 times, the error report control section 8 suppresses the subsequent generation of the error report signal 17.

The maintenance diagnostic device 2, which has been notified of the correctable error occurrence report by the error report signal 17, uses the error log signal 18 to send error log information such as the corresponding address and bit position of the control storage unit 3 where the error occurred to the arithmetic control unit. Collect from 6.

When the maintenance diagnostic device 2 completes error logging, it generates a hold release signal 20, instructs the error report control circuit 8 to release the hold signal 16, and also sends an instruction execution restart instruction signal 19 to the arithmetic control unit 6 to execute the next command. Instructs to resume instruction execution from the microinstruction that should be executed.

By adopting such a configuration, the device of this embodiment can:
When the detection of a correctable error is reported once, the error information is logged in the maintenance/diagnosis device 2, and after that, even if a correctable error occurs, the microinstruction is By only correcting the data and not collecting error information using the maintenance/diagnosis device 2, we prevent the device's original performance from deteriorating due to the error log information collection operation in case the correctable error is a fixed failure. do. At the same time, if the correctable error is a fixed failure, 256 correctable errors will occur in a relatively short period of time, so when the number of correctable errors has reached 256, the maintenance diagnostic equipment logs error information and suppresses future error reports to the maintenance/diagnosis device.

Therefore, when a correctable error is a fixed failure, error logging information due to the same cause is logged twice in the maintenance diagnosis device within a relatively short period of time, making it possible to obtain useful maintenance information. I can do it. As a result, rather than replacing the control memory unit where a fixed failure has occurred, it is possible to perform preventive maintenance to prevent the possibility of uncorrectable multiple-bit errors occurring due to frequent occurrence of correctable errors, and to improve the reliability of the control memory. can.

As described above, the present invention has the effect of improving reliability and maintainability.

[Brief explanation of the drawing]

The figure is a configuration diagram showing one embodiment of the present invention, 1...
...Information processing device, 2...Maintenance diagnosis device, -9
- 3... Control storage unit, 4... Error detection and correction unit, 5... Switching unit, 6... Arithmetic control unit, 7... ...Counting unit, 8...Error reporting control unit, 9,10.11...Microinstruction,
12...Address signal, 13...Correctable error detection signal, 14...256 error detection signal, 15...1 error detection signal, 16.
...Hold signal, 17...Error report signal, 18...Error log signal, 19...
. . . Command restart instruction signal, 20 . . . Hold release signal, 21 . . . Color data signal. 10-

Claims (1)

[Claims] In an information processing apparatus that stores a microprogram including a plurality of microinstructions in a control storage means and sequentially reads out the plurality of microinstructions to perform data processing, the microprogram read out when reading the microinstructions from the control storage means detection and correction means for detecting an error in an instruction and correcting the microinstruction if the error is a correctable error; a counting means for counting the number of times the error has been corrected; and a counting means for counting the number of times the error has been corrected; control means for generating an error report signal when the number of corrections has been made, and then generating the error report signal again when the number of corrections has reached a second prescribed number of times, and suppressing generation of the error report signal thereafter. An information processing device characterized by: