JPS6341104B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a method for disconnecting a system control device of an information processing device.

[Prior Art] Conventionally, this type of system control device disconnects the system control device that detects an error from the system. Therefore, in order to reduce the delay time of access requests in the system control device, a means for determining the priority of access requests from a group of subprocessors corresponding to the system control device and a means for determining the priority of access requests from a group of subprocessors that do not correspond to the system control device are provided. In a system control device in which priority determination between system control devices can be performed within the system control device, the result of the priority determination means of the subprocessor group of the system control device corresponding to the subprocessor group, and The system control device that does not correspond to the sub-processor group is checked for consistency with the result of the priority determination means of the sub-processor group, and if there is a mismatch, the system control device that has detected the mismatch is simply separated from the system, or the priority of the sub-processor group is changed. If the determination means simply disconnects a system control device that has detected an error from the system, there is a drawback that even system control devices that do not need to be disconnected are also disconnected from the system. In other words, it has the disadvantage of increasing the number of system failures.

[Purpose of the invention]

An object of the present invention is that since the subprocessor group corresponding to the separated system control device is naturally separated from the system, when the priority determination means for the subprocessor group detects a mismatch or an error, the subprocessor group corresponding to the subprocessor group The above drawbacks are solved by separating the system control device,
The purpose of this invention is to provide a system that reduces system downtime by making use of the remaining subprocessors and their corresponding system control devices.

[Structure of the invention]

According to the first aspect of the present invention, means for determining the priority of access requests from a group of subprocessors having a plurality of system control devices and corresponding to each system control device;
A means for determining the priority of access requests from a subprocessor group that does not correspond to the subprocessor group, a priority determination result of the subprocessor group of the system control device that corresponds to the subprocessor group, and a priority of the subprocessor group of the system control device that does not correspond to the subprocessor group. A method for disconnecting a system control device of an information processing device, comprising: means for comparing with a determination result; and means for disconnecting a system control device corresponding to the subprocessor group from the system when the comparison means detects a discrepancy. can get.

Further, according to the second aspect of the present invention, the system has a plurality of system control devices, and includes means for determining the priority of access requests from subprocessor groups corresponding to each system control device, and means for determining priority of access requests from subprocessor groups that do not correspond to each system control device. , comprising: error detection means for the priority determination means of the subprocessor group; and means for separating from the system a system control device corresponding to the subprocessor group that has requested access to the priority determination means in which the error detection means has detected an error. A method for disconnecting the system control device of the information processing device is obtained.

[Explanation of Examples]

Next, the first and second inventions will be explained in detail with reference to the drawings. Figure 1 is from books 1 and 2.
1 is a circuit diagram showing an embodiment of the invention; FIG. The device of this embodiment has subprocessor groups 10A and 10B.
, system control devices 20A and 20B, and memories 30A and 30B, and when the system control device 20A or 20B breaks down, it is possible to disconnect the system control device 20A or 20B from the system and continue operation. It is structured like this. At this time, naturally, the subprocessor group 10A or 10B corresponding to the system control device is also separated from the system.

Each sub-processor group has two sub-processors 11 which are an arithmetic processor and an input/output processor.
A, 12A and 11B, 12B are included.
The access request signals 11A', 12A' of the sub-processors 11A, 12A are sent not only to the corresponding system control device 20A but also to the non-corresponding system control device 20B. The sub-processor 1
The same applies to 1B and 12B.

Each system control device 20A and 20B receives sub-processor access request signals 11A' and 12.
A', 11B', 12B' are input to the priority determination circuits 21A, 22A, 21B, 22B of the sub-processor group according to a predetermined priority order, and the determination result signals 21A'', 22A'' and 21
B'', 22B'' are input to the priority determination circuits 28A and 28B between system control devices, and as a result, an access request signal 28 to the memories 30A and 30B is sent to the subprocessor that outputs the memory access request.
A' and 28B' are allowed.

Priority determination circuit 21A for each sub-processor group,
Judgment result signal 21 of 22A, 21B, 22B
A'', 22A'' and 21B'', 22B'' are input to coincidence comparison circuits 23A, 24A and 23B, 24B, and are compared to see if they match between the system control devices.

Priority determination circuit 21A, 2 for subprocessor group
2A, 21B, and 22B have a known parity check circuit, and the result is a parity error signal 2.
They are output as 1A', 22A' and 21B', 22B'.

Mismatch signal 24 output from match comparison circuit 24A
A' and parity error signal 22A' are OR circuit 26A
is sent to the system control device 20B corresponding to the sub-processor group 10B. the above
The output signal 26A' of the OR circuit 26A is the output signal 26A' of the OR circuit 26A.
5B is logically summed with the mismatch signal 24B' and the parity error signal 22B' to set an error flip-flop 27B. Once error flip-flop 27B is set, system controller 20B is disconnected from the system by known means.

The above operation is the same for the system control device 20A.

Next, its operation will be explained. System control device 2
The sub-processor group corresponding to 0A is 10A, and the priority determination means for the sub-processor group 10A is 21A. For this reason, the priority determination means 21
When a parity error is detected at A, the parity error signal 21A' sets the error flip-flop 27A and disconnects the system controller 20A corresponding to the subprocessor from the system. The other system control device 20B continues to operate. Furthermore, when disconnected, each signal between the system control devices 21A'', 22A'', 21B'', 22B'',
26A' and 26B' need to be gated to prevent malfunction, but are omitted in this figure.

a determination result signal 21A'' of the priority determination means 21A of the sub-processor group 10A of the system control device 20A corresponding to the sub-processor group 10A;
A match comparison circuit 23A checks for a match with the judgment result signal 21B'' of the priority judgment means 21B of the sub-processor group 10A of the non-corresponding system control device 20B.
A' sets the error flip-flop 27A and disconnects the system controller 20A from the system.

Next, the sub-processor group 10B of the system control device 20B corresponding to the sub-processor group 10B
The determination result signal 22 of the priority determination means 22B of
A match comparison circuit 24A checks whether the signal B'' and the determination result signal 22A'' of the priority determination means 22A of the system control device 20A which do not correspond to each other are matched. If they do not match, the error flip-flop 27B is is set, and the system control device 20B is disconnected from the system.

The sub-processor group 10 of the system control device 20A that does not correspond to the sub-processor group 10B
When the B priority determining means 22A has a parity error, the parity error signal 22A' sets the error flip-flop 27B and disconnects the system control device 20B from the system.

The above operation is the same for the system control device 20B.

Further, if there is a hard error in the priority determination circuit 21B, the system control device 20A is simply disconnected from the system, and the system control device 20B is operated without being disconnected. That is, when there is an error in the access request signal 11A', the priority determination circuit 21B operates, and the determination result signal 21B'' is input to the coincidence comparison circuit 23B.Concordance comparison circuit 2
When an error is detected in 3B, the determination result signal 23
B' is supplied to the error flip-flop 27A as a mismatch signal 26B'. As a result, the system control device 20A is disconnected from the system, and the subprocessor groups 11A and 12A corresponding to this system control device are also disconnected from the system, so the priority determination circuit 21B is disabled after the system control device 20A is disconnected. Become.

By operating as described above, the system control device corresponding to the subprocessor group is separated from the system even in the case of a mismatch or in the case of error detection.

〔Effect of the invention〕

As explained above, the present invention has the effect that it is no longer necessary to disconnect a system control device that does not need to be disconnected from the system.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the first and second inventions. 11A, 12A, 11B, 12B... sub-processor, 10A, 10B... sub-processor group,
21A, 22A, 21B, 22B...Priority judgment circuit for sub-processor group, 28A, 28B...Priority judgment circuit between system control devices, 23A, 2
4A, 23B, 24B... Match comparison circuit, 25
A, 26A, 25B, 26B...OR circuit, 27
A, 27B...Error flip-flop, 20
A, 20B...System control device, 30A, 30
B...Memory, 11A', 12A', 11B', 12
B'...Access request signal, 21A', 22A', 2
1B', 22B'... Parity error signal, 21A'',
22A'', 21B'', 22B''...Judgment result signal of priority judgment circuit, 23A', 24A', 23B', 24
B'...mismatch signal, 26A', 26B'...output signal of OR circuit, 28A', 28B'...memory access request signal.

Claims (1)

[Scope of Claims] 1. A means for determining the priority of access requests from a sub-processor group having a plurality of system control devices and corresponding to each system control device, and a means for determining the priority of access requests from a group of sub-processors that do not correspond to each system control device; a priority determination result of the sub-processor group of the system control device corresponding to the sub-processor group;
Comparing means for comparing a priority determination result of the sub-processor group of a system control device that does not correspond to the sub-processor group, and means for separating the system control device corresponding to the sub-processor group from the system when the comparison means detects a discrepancy. A method for disconnecting a system control device of an information processing device, characterized in that: 2. Means for determining the priority of access requests from sub-processor groups having a plurality of system control devices and corresponding to each system control device, means for determining the priority of access requests from sub-processor groups that do not correspond to each system control device, and means for determining the priority of access requests from sub-processor groups that do not correspond to each system control device, and priority determination of sub-processor groups. A system for an information processing apparatus, comprising: an error detection means of the means; and means for separating from the system a system control device corresponding to a subprocessor group that has requested access to the priority determination means in which the error detection means has detected an error. Control device disconnection method.