JPS6057607B2 - Diagnostic control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diagnostic control method for a microprogram-controlled information processing device.

The demand for high reliability of information processing devices is increasing.

In storage devices and the like, reliability can be easily achieved by using error detection and automatic correction circuits, but in information processing circuits, a duplication method with extremely excellent defect detection ability is sometimes adopted. This duplication system is becoming easier to implement due to advances in high-density integrated circuits. In an information processing device having such a duplex information processing circuit, the duplex circuit is executed while always comparing the operations of the two circuits at the same timing, and when a mismatch signal is detected, the duplication circuit is executed a predetermined number of times. The instruction will be retried. If a mismatch signal continues to be detected even after the retry, it is treated as a fixed hardware failure, and the diagnostic device detects which of the information processing circuits is at fault. At this time, all of the information processing circuits are diagnosed on one side, and when the diagnosis results are good, the other information processing circuit is diagnosed. If a failure is detected as a result of later diagnosis, the information processing circuit diagnosed later is disconnected. When a failure is detected in the first diagnosed information processing circuit, the information processing circuit is disconnected and processing shifts to diagnosis of other information processing circuits. As a result of the diagnosis, only the faulty information processing circuit is disconnected, and normal processing is restarted only with the non-faulty information processing circuit. Of course, when a failure is detected in both of the duplicated information processing circuits, the information processing device is disconnected. When performing such a microdiagnosis, the diagnostic device first writes several steps of a diagnostic microprogram into the control memory corresponding to the first information processing circuit and executes it.The diagnostic result is given to the diagnostic device, and the contents are In addition to determining the
The next diagnostic microprogram is written into the control memory and the next diagnosis is started.

In this way, diagnosis by the J diagnostic microprograms is repeated as many times as are sequentially specified. When all the diagnoses regarding the first information processing device are completed, the diagnostic device
The process moves on to diagnosis processing of the second information processing circuit of the multiplexed information processing circuit. In this way, the equipment with duplicate hardware can be powered almost twice as much as the conventional equipment without duplication.
The disadvantage is that the diagnosis time is doubled. An object of the present invention is to provide a diagnostic control method that greatly reduces the time required for diagnosing a redundant information processing circuit, which requires time, by halving the time required to write a microprogram, which occupies a large proportion of the total diagnostic time. There is a particular thing. The system of the present invention has a first information processing circuit and a second information processing circuit that perform the same operation at the same timing.
In the control method for commonly performing processing operations of the information processing circuits, a microinstruction storage means for storing microinstructions for commonly controlling the diagnostic operations of the first information processing circuit and the second information processing circuit; The present invention is characterized in that after the first information processing circuit is diagnosed using microinstructions read from the microinstruction storage means, the second information processing circuit is subsequently diagnosed.

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

In FIG. 1 showing a first embodiment of the present invention, the microdiagnosis control method of the present invention includes a control storage device 2, a first information processing circuit 30, a second information processing circuit 31 in an information processing device 1,
, a diagnostic device 4 having a comparison circuit 40 and a diagnostic indicator control circuit 41, and a storage device 5.

Next, the operation of the present invention will be explained with reference to FIG. The information processing device 1 transfers the instructions stored in the main storage device 5 under the control of the control storage 2 to the information processing circuits 30 and 31.
Execute by. The information processing circuits 30 and 31 in the present invention are duplicated, so that the same operation is performed at the same timing, and the execution results are sequentially compared by the comparison circuit 40 in the diagnostic device. When a mismatch is detected, either the first information processing circuit 30 or the second information processing circuit 31. It is thought that the failure occurred. When a mismatch is detected, the diagnostic device 4 reads one test processing portion of the diagnostic microprogram from the storage device 5 and writes it into the diagnostic microprogram area of the control storage device 2 . When the writing operation to the control storage device is completed, the first information processing circuit 30 is first diagnosed using the written microprogram according to the instructions of the diagnostic indicator control circuit 41. When a diagnosis completion report is given from the control storage device 2, the diagnostic indicator control circuit 42 causes the second information processing/processing circuit 3 to
The first diagnostic process is started, the diagnosis is executed, the diagnostic results of the first information processing circuit 30 are edited, and the results are written into the specified area of the main storage device. When the diagnostic processing of the second information processing circuit 31 is completed, the diagnostic results are similarly edited and written to the designated area of the main storage device. The above diagnostic results are written to the main memory and simultaneously reported to the maintenance personnel via the display device of the console. As described above, when the diagnosis for one test process of both information processing circuits 30 and 31 is completed, the next diagnostic microprogram is newly stored in the diagnostic microprogram area of the control storage device 2 according to the instructions from the diagnostic indicator control circuit 42. is written and diagnostic processing continues as described above. Failures in the first information processing circuit 30 and the second information processing circuit 31 can be detected by means such as a parity check, in addition to detection by discrepancy detection in the comparison circuit as described above.
or 31 may be independently detected.

In diagnosing such a failure, it is more time-efficient to diagnose only the information processing circuits 30 and 31 that are clearly defective. In the present invention, according to instructions from the diagnostic indicator control circuit 42, one of the information processing circuits 30 or 3
It is also possible to diagnose only 1. FIG. 2 is a diagram showing an example of an indicator peripheral circuit in the diagnostic indicator control circuit 41 of FIG. 1, and Table 1 shows an example of a diagnostic range based on the indicator values. In the embodiments of the present invention, the diagnostic device is included in the information processing device, but even when the information processing device is completely independently diagnosed from the outside, the same diagnostic processing is possible.

Further, when a diagnostic device is provided externally, either or both of the comparison circuit 40 and the diagnostic indicator control circuit 41 may be included in the information processing device. The present invention has the effect that by providing a function for finely classifying the circuit to be diagnosed using diagnostic indicators, the duplex information processing circuit can perform an effective diagnostic function with less wasted time.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of the present invention, and FIG. 2 is a diagram showing an embodiment of the present invention.
FIG. 3 is a diagram illustrating details of the diagnostic indicator circuit shown in the figure; 1 and 2, 1... information processing device, 2... control storage device, 30, 31...
...Information processing circuit, 4...Diagnostic device, 40.
... Comparison means, 41 ... Indicator control circuit, 410 ... Indicator, 5 ...
··Storage device.

Claims (1)

[Claims] 1. Diagnosis of the first information processing circuit and the second information processing circuit in a control method in which a first information processing circuit and a second information processing circuit perform the same processing operation at the same timing. After diagnosing the first information processing circuit using microinstruction storage means for storing microinstructions that commonly control operations and microinstructions read from the microinstruction storage means, the second information processing circuit is subsequently diagnosed. A diagnostic control method characterized by: