JPH01102650A - Diagnosing system - Google Patents

Abstract

PURPOSE:To attain the diagnosis without using an exclusive hardware by setting only one of two registers of a duplex structure under an available state while the other register is undergoing the diagnosis of its normalcy. CONSTITUTION:The duplex registers 1 and 2 always receive the same data when they receive accesses from a host device. A control means writes the diagnosing data to the 1st one of both registers 1 and 2 for diagnosis of the normalcy of the 1st register. While the error data is written to a 2nd register to produce a parity error. Thus, only a 1st register is available at diagnosis and therefore the diagnosis is possible without using any exclusive hardware.

Description

[Detailed Description of the Invention] [Summary] Regarding a diagnostic method, particularly a diagnostic method for diagnosing the normality of registers of an arithmetic processing unit, when diagnosing the normality of one of the duplicated registers, this one The purpose of this system is to enable diagnosis without the need for dedicated hardware because only the registers can be used. A multiplexer selects and outputs the output data of one of the registers out of the data read out from the registers, and an odd-even check is performed on the data read out from the duplicated register, and as a result of the odd-even check, a bit error is detected. A diagnostic method for an arithmetic processing device comprising an odd-even check circuit that controls the multiplexer so as to prevent the output of the data
When diagnosing the normality of the first register among the duplicated registers, data for diagnosis is input into the first register, and an odd-even error is detected in the second register among the duplicated registers. The apparatus includes a control means for writing error data that occurs, and is configured so that only the first register can be used during the diagnosis.

[Industrial application field]

The present invention relates to a diagnostic method, and particularly to a diagnostic method for diagnosing the normality of registers of an arithmetic processing unit.

Processing units are subject to reliability, availability and maintainability (R
AS;Reliability, eight availability
It is required that the product be excellent in terms of quality and serviceability. Therefore, it is desirable that the arithmetic processing device be a non-stop device to prevent system failure.

(Prior Art) As a method of realizing a non-stop device, a system using duplicated registers can be considered. FIG. 4 is an explanatory diagram of the principle of this possible method, and shows the main parts of a possible arithmetic processing device using this method.

The same data is written into the registers 41 and 42 from the host device, and the read data is sent to the corresponding parity check circuits 43 and 44 and the multiplexer 45.
and will be supplied. Since the data written to the registers 41 and 42 includes an odd-even check bit, the data that has a bit error as a result of the odd-even check is sent to the multiplexer 4.
The multiplexer 45 is controlled by the odd-even check circuits 43 and 44 so that the signal is not output from the 5. As a result, even if one of the registers 41 and 42 cannot operate normally, a non-stop device can be realized by using the other register.

Further, when an abnormality is detected in the registers 41, 42, the normality of one of the registers 41, 42 is diagnosed. During this diagnosis, diagnostic data is written into one of the registers 41 and 42 from an external monitoring device (not shown) and then read out to diagnose the normality of this one register. In this case, the monitoring device needs to control multiplexer 45 so that only one register to be diagnosed is available.

[Problem that the invention seeks to solve]

However, the above possible method has a problem in that it is necessary to provide dedicated hardware and control the multiplexer 45 from an external monitoring device so that only one register to be diagnosed can be used at the time of diagnosis.

According to the present invention, when diagnosing the normality of one of the duplicated registers, it is possible to make the diagnosis possible without providing dedicated hardware to enable the use of only this one register. The purpose is to provide a diagnostic method.

Measures to solve problem C] FIG. 1 is a diagram explaining the principle of the present invention.

In the figure, the arithmetic processing unit to which the method of the present invention is applied has a duplicated register 1.2 to which the same data is always supplied when accessed from a host device, and a duplicated register 1.2. A multiplexer 3 selects and outputs the output data of one of the registers out of the data read out from °2, and an odd-even check is performed on the data read out from the duplicated register 1.2, and the result of the odd-even check is a bit error. multiplexer 3 to prevent the output of the detected data.
It consists of an odd-even check circuit 4.5 for controlling.

6 is a control means.

(Function) The control means 6 controls the first of the duplicated registers 1.2.
During diagnosis 1gi to diagnose the normality of the registers, by writing diagnostic data in the first register and writing error data that causes an odd-even error in the second register of the duplicated registers 1.2. , only the first register can be used during diagnosis.

Therefore, since only the first register can be used during diagnosis, diagnosis can be performed without providing dedicated hardware.

〔Example〕

The second factor shows an embodiment of an arithmetic processing device to which the method of the present invention is applied. In the figure, 11.12 is an AND circuit, 13.
14 is a register, 15 and 16 are odd/even check circuits, 17 is a multiplexer, and 18 is an external monitoring device. register 1
3.14, odd-even check circuit 15.16, multiplexer 1
7 are registers 41 and 42 and odd-even check circuit 4 in FIG. 4, respectively.
3°44 and multiplexer 45.

First, a case in which a host device (not shown) accesses the registers 13 and 14 will be described. AND circuit 11.12 which is normally supplied with a high level signal from the host device
When data is written and read out identically to the registers 13 and 14 via the registers 13 and 14, the odd-even check circuits 15 and 16 perform an odd-even check. The multiplexer 17 is controlled by the odd-even check circuits 15 and 16 so that data having a bit error as a result of the odd-even check is not output from the multiplexer 17. Further, when the odd-even check circuits 15.16 detect an odd-even error, they supply a 0-level signal to the corresponding AND circuit 11.12. This prevents the host device from accessing registers that cannot operate normally. Therefore, even if one of the registers 13 and 14 cannot operate normally, a non-stop device can be realized by using the other register.

Next, the diagnosis when the external monitoring device 18 accesses the registers 13 and 14 will be described. Upper device is register 1
If an abnormality is notified while accessing 3.14,
Diagnostic data is read out from the external monitoring bag N18 for one of the registers 13 and 14 in which an abnormality has been detected, and the normality of this one register is diagnosed.

For convenience of explanation, a case will be described in which the normality of the register 13 is diagnosed. In this case, the external monitoring device i! 18 writes data for diagnosis into the register 13, and writes data that causes an odd-even error into the register 14. As a result, the odd-even check circuit 16 detects a bit error (odd-even error) in the output data of the register 14, and controls the multiplexer 17 to selectively output the output data of the register 13. Furthermore, access to the register 14 of the host device is also inhibited by the AND circuit 12. Therefore, the external monitoring device 18 reads out the diagnostic data written in the register 13 and compares it with the data for determining normality (original diagnostic data), so that the external monitoring device 18 uses dedicated hardware at the time of diagnosis. Diagnosis of the register 13 can be performed by making only the register 13 usable without controlling the multiplexer 17.

Note that the register 14 cannot be accessed from the host device while error data is stored in the register 14, so after the diagnosis is completed, the external monitoring device 18 may write data such as diagnostic data that is unlikely to cause odd-even errors.

FIG. 3 is a flowchart illustrating the operation of the external monitoring device 18 during diagnosis. When the diagnosis is started, step S+ writes the diagnostic data to the register to be diagnosed (register 13 in the above example) among registers 13 and 14 and writes the data to the other register (register 14 in the above example). Write error data. In step S2, the normality of the register to be diagnosed is diagnosed by reading data from the register in which the diagnostic data is written and comparing it with normality determination data (original diagnostic data). When the diagnosis is completed in this way, step S3 writes normal data that is unlikely to cause odd-even errors into the other register, so that the register
．． 14 accesses.

Although the present invention has been described above using examples, the present invention can be modified in various ways according to the gist of the present invention, and these are not excluded from the present invention.

〔Effect of the invention〕

According to the present invention, when diagnosing the normality of the first register among the duplicated registers, diagnostic data is written to the first register, and the second register among the duplicated registers is written to the odd-even register. It is equipped with a control means for inputting and outputting error data that generate errors, and ``only the first register can be used during diagnosis, so dedicated hardware is provided to enable only the first register to be used during diagnosis. Diagnosis can be carried out without having to use the method, and it is extremely useful from a practical point of view.

[Brief explanation of the drawing]

FIG. 1 is a diagram explaining the principle of the present invention, FIG. 2 is a block diagram showing an embodiment of an arithmetic processing device to which the method of the present invention is applied, and FIG. 3 is a flowchart for explaining the operation of an external monitoring device during diagnosis. FIG. 4 is an explanatory diagram of the principle of a possible diagnosis method. 1 to 3, 1.2 is a register, 3 is a multiplexer, 4.5 is an odd-even check circuit, 6 is a control means, 11.12 is an AND circuit, 13.14 is a register, and 15.16 is an odd-even check circuit. 17 is a multiplexer, 18 is an external monitoring device, and 81 to S3 are steps. Main house gI4n environment management diagram i1 prisoner IP! 2 Figure 3 Figure 11 E 5 entry Suga-Ya old) Clear β and FQF policy 4 ``()

Claims (1)

[Claims] Duplicated registers (1, 2) that are always supplied with the same data when accessed from a host device, and output data of one of the data read from the duplicated registers. A multiplexer (3) that selectively outputs data and performs an odd-even check on the data read out from the duplicated register, and controls the multiplexer so as to prevent the output of data in which a bit error is detected as a result of the odd-even check. In a diagnostic method for an arithmetic processing unit comprising an odd-even check circuit (4, 5), when diagnosing the normality of a first register among the duplicated registers, diagnostic data is stored in the first register. Writing, the second register of the duplicated registers is provided with a control means (6) for writing error data that causes an odd-even error, and only the first register can be used during the diagnosis. Diagnostic method.