JP2000020414A - Method and device for diagnosing fault of shared bus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the separation performance of a fault position by collating a transmitted diagnostic pattern with a returned diagnostic pattern by a diagnostic module and separating a fault position between a shared bus and a processing module. SOLUTION: A bus diagnosis function part 110 in a diagnostic module 103 outputs a bus diagnosis instruction to a diagnosis return function part 111 in a processing module 104 to be a target through a diagnostic line 102 and sets up a return route between a signal line of a shared bus 101 specified by the function part 111 and the diagnostic line 102. Then the function part 110 sends a diagnostic pattern to the specified signal line of the shared bus 101 or the diagnostic line 102, collates a returned and received diagnostic pattern with the transmitted diagnostic pattern and separates a fault position between the shared bus 101 and each processing module 104.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for diagnosing a fault in a shared bus, and more particularly to a method and an apparatus for diagnosing a fault between a shared bus and a processing module connected thereto.

[0002]

2. Description of the Related Art Conventional shared bus fault diagnosis methods include:
For example, a "bus failure test method" (see FIG. 1, prior art (1)) described in Japanese Patent Application Laid-Open No. 7-182254 is known. In the bus failure test method described in the publication, a bus is connected to a common bus. A test pattern generation circuit, a test pattern reception circuit, a verification result report circuit, and a verification result collection circuit are provided in the CPU, the memory, and the plurality of I / O units, respectively. When the test pattern is transmitted above, this test pattern is collated by each test pattern receiving circuit unit, and the data of the collation result is collected from each collation result report circuit unit by the collation result of the source of the test pattern. The information is transmitted to the circuit unit and collected. In addition, a test line is provided as a part of the common bus, and a test pattern and a verification result are transmitted based on the timing of a control signal on the test line.

A "common bus diagnostic system" described in Japanese Patent Application Laid-Open No. 2-133848 (see FIG. 1, prior art (2))
In the diagnostic program, a master device such as a channel control device is provided with a mounting table indicating the order of connection of slave devices such as an input / output control device. Implement Here, the diagnostic program for the slave device is executed on the common bus.

[0004]

In the conventional bus fault isolation system, a bus order is sent to each I / O on the bus in order to confirm the fault, and a diagnosis performed by each I / O is performed. Since the result was read via the bus, in the event of a bus failure, etc., the result of communication with the normal I / O becomes abnormal due to erroneous response of I / O other than specified or erroneous data. There was sex.

For example, in the case of the bus failure test apparatus of the prior art (1), since the test pattern comparison result is reported using the address bus and the data bus, the address signal line or the data signal line of the common bus is used. If a failure occurs in a part of the verification result, the verification result information transmitted from the verification result reporting circuit may be received by the verification result collection circuit with incorrect contents, which may result in an erroneous determination of the failure location. There is.

Further, in the case of the bus diagnostic system of the prior art (2), a slave device different from the address designated by the master device erroneously responds due to a failure of the address receiving circuit of the slave device, etc.
There is a possibility that a response from the slave device at the designated address cannot be normally received by the main device, and this may cause a normal slave device to be erroneously determined to have failed.

(Object of the Invention) It is an object of the present invention to improve the performance of isolating a fault location in a diagnosis of a bus fault occurring between a shared bus and a processing device connected thereto.

[0008]

According to the present invention, there is provided a method for diagnosing a shared bus fault in a processing apparatus in which a diagnostic module and a plurality of processing modules are connected to a shared bus and a diagnostic line. The diagnostic module transmits diagnostic control information and a diagnostic pattern to each processing module via the shared bus or the diagnostic line, and each processing module transmits the diagnostic pattern received via the shared bus or the diagnostic line. The diagnostic module is returned via the diagnostic line or the shared bus, the diagnostic module receives the diagnostic pattern returned to the diagnostic line or the shared bus, and compares the transmitted diagnostic pattern with the returned diagnostic pattern. In addition, a fault location between the shared bus and the processing module is isolated.

The diagnostic line includes a diagnostic line control highway and a diagnostic line return highway, and the shared bus includes an address bus and a data bus. The shared bus fault diagnostic apparatus of the present invention, which performs a pattern return diagnosis for each signal line to isolate a fault location between the shared bus and each processing module, provides a diagnostic module and a plurality of processing modules for a shared bus and a diagnostic line. A shared bus failure diagnostic device for a processing device connected to a module, wherein the diagnostic module comprises:
Sending a diagnostic pattern to the shared bus or the diagnostic line,
A bus diagnostic function unit that performs isolation of a fault location between the shared bus and the processing module by comparing the diagnostic pattern with the diagnostic line or the diagnostic pattern received from the shared bus, and each processing module includes: The diagnostic pattern is characterized by having a diagnostic return function unit that sets a return route of the diagnostic pattern between a shared bus and the diagnostic line to return the diagnostic pattern.

(Operation) In a processing device in which a diagnostic module and a plurality of processing modules are connected to a shared bus, diagnostic lines such as a diagnostic line control highway and a diagnostic line return highway are provided. A diagnostic pattern is transmitted / received via a loopback route set between the line and the shared bus, collated, and a fault location is isolated and determined. A return route is set for each signal line of the address bus and the data bus of the shared bus, and a detailed failure location diagnosis is performed.

[0011]

FIG. 1 is a block diagram showing the principle of a method and apparatus for diagnosing a shared bus fault according to the present invention. A data processing apparatus including a plurality of processing modules for implementing the shared bus failure diagnosis method of the present invention has a basic configuration in which a diagnostic module 103 and a plurality of processing modules 104 are connected to a shared bus 101 and a diagnostic line.

The diagnostic module 103 has a bus diagnostic function unit 110 for controlling the shared bus failure diagnosis for the processing module 104, transmitting the diagnostic pattern and collating the diagnostic pattern returned by the processing module 104.

Each processing module 104 includes a shared bus 10
1 and has a diagnostic loopback function unit 111, and is connected to each processing module 104 via the diagnostic line 102. Diagnosis return function unit 111
Sets a return route between the shared bus 101 and the diagnostic line 102, and returns a diagnostic pattern transmitted from the bus diagnostic function unit 110 between them.

The basic operation of the data processing device is as follows. When the diagnostic module 103 performs a bus diagnosis, the bus diagnostic function unit 110 issues a bus diagnostic instruction to the diagnostic return function unit 111 of the target processing module 104 via the diagnostic line 102, and the diagnostic return function unit 11
1 is a signal line and a diagnostic line 1 of the designated shared bus 101.
A return route is set between 02. Thereafter, the bus diagnostic function unit 110 sends a diagnostic pattern to the signal line or diagnostic line 102 of the designated shared bus 101,
The returned diagnostic pattern is collated with the transmitted diagnostic pattern.

The bus diagnostic function unit 110 performs the above operation bidirectionally for all address signal lines and all data signal lines of all processing modules. Thereby, the shared bus 10
1 and the processing module 104 can be separated in detail.

Next, a more specific embodiment of the method and apparatus for diagnosing a shared bus fault of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a diagram showing the present embodiment. With reference to FIG.
And a processing module 104 connected to an address bus 201 and a data bus 202.
In order for the diagnosis module 103 to perform bus diagnosis for each processing module 104, the modules are connected by a diagnosis line control highway 204 and a diagnosis line return highway 203.

The bus diagnostic function control unit 213 of the diagnostic module 103 supplies the processing module 104 with the address bus 201 or the data bus 202 and the diagnostic line return highway 203 or the diagnostic line control highway 204 via the diagnostic line control highway 204. Specify return route setting.

In the processing module 104 to be subjected to the bus diagnosis, the diagnostic return function control unit 215 receiving an instruction from the bus diagnostic function control unit 213 replaces the diagnostic pattern return unit 21.
4 is instructed to set a return route. After setting the return route, the bus diagnostic function control unit 213 transmits a diagnostic pattern from the diagnostic pattern transmission unit 211 to the specified address bus 201, data bus 202, or diagnostic line control highway 204. Thereafter, the diagnostic pattern returned by the processing module is input to the diagnostic pattern matching unit 212 of the diagnostic module, and is compared with the transmitted diagnostic pattern.

Next, a detailed diagnosis operation of a fault location and the like in the data processing device of the present embodiment will be described.

The diagnostic pattern transmitting section 211 of the diagnostic module 103 includes an address bus 201, a data bus 202,
It is possible to transmit a diagnostic pattern to any signal line of the diagnostic line control highway 204, and the diagnostic pattern matching unit 212 also performs address bus 201, data bus 20
2. A signal can be input from any signal line of the diagnostic line turning highway 204. Similarly, the diagnostic pattern turn-over unit 214 of the processing module 104 also
A return route can be set between the address bus 201, the data bus 202, the diagnostic line control highway 204, and the diagnostic line return highway 203. Therefore, the bus diagnostic function control unit 213 switches the connection points with the signal lines on both sides so that the address bus 2
01 and all the signal lines of the data bus 202 can be tested in both directions.

The above diagnostic processing is performed for all processing modules 1
04, the failure of the shared bus,
It is possible to determine in detail whether an individual processing module has a fault, a fault on the transmitting side of the processing module, or a fault on the receiving side.

Next, the specific structure and operation of the diagnostic pattern folding section 214 will be described in detail.

FIG. 3 is a diagram showing the configuration of the diagnostic pattern turn-back unit 214 of the processing module 104. Here, a module external address / data signal line 301 outside the module connected to the shared bus 101 and a module internal address / data signal line 30 inside the processing module are connected.
3 and both address / data signal lines 301, 314
Are separated by a bus input / output interface unit 314.

The diagnostic pattern turning section 214
A bus diagnostic output selecting unit 313 connected to the module internal address / data signal line 303, a bus diagnostic input selecting unit 312, and a bus diagnostic loopback control unit 311 connected to a bus input / output interface unit 314 that controls these units. Have.

When the processing module receives a bus diagnosis instruction from the diagnosis module via the diagnosis line control highway 204 and the clock / frame pulse signal line 302, the bus diagnosis return control unit 311 sets the bus diagnosis input selection unit 312 and the bus diagnosis The output selection unit 313 and the bus input / output interface unit 314 are controlled to set a return route between the requested common bus signal line and the diagnostic line control highway 204 or the diagnostic line return highway 203.

FIGS. 4 and 5 are timing charts showing two bus diagnostic operation examples. Diagnostic line clock and diagnostic line frame pulse signal line 30 for supplying an operation reference signal
2. Signals on the signal lines of the diagnostic line control highway 204 and the diagnostic line return highway 203 for giving a bus diagnostic instruction to the bus diagnostic return control unit 311 are shown. In the operation example of “bus diagnosis 1” shown in FIG. 4, the diagnosis module transmits a diagnosis pattern via the diagnosis control highway 203, and the processing module transmits the diagnosis pattern to the address
This is an example in which the data is turned back to the data bus.
In the operation example of “bus diagnosis 2” shown in FIG. 7, the diagnosis module transmits a diagnosis pattern via the address / data bus,
The processing module is an example in which the diagnostic pattern is folded back to the diagnostic line folding highway 203.

On the clock / frame pulse signal line 302, the clock signal of the diagnostic line from the diagnostic module and the frame pulse signal of each processing module are transferred to the processing module.

In the diagnostic line control highway 204, in synchronization with the clock signal and the frame pulse signal, a module ID uniquely assigned to each processing module and a command code which is a diagnostic instruction content for the processing module specified by the module ID. Is transferred, and FIG.
In the "bus diagnosis 1" shown in (1), each information of the diagnosis pattern which is further looped back to the address bus or the data bus is transferred to each processing module. In "bus diagnosis 2" shown in FIG. 5, the diagnosis pattern is transferred to the processing module via the address / data bus.

In the address / data bus or the diagnostic line return highway 203, a diagnostic pattern returned from the diagnostic line control highway or a diagnostic pattern returned from the address data bus is transferred from the processing module to the diagnostic module. By alternately executing “bus diagnosis 1” and “bus diagnosis 2” on the address / data bus, for example, in units of signal lines of each bus, bidirectional pattern return diagnosis between the diagnosis module and the processing module is possible. Becomes

FIG. 6 is a diagram showing an example of correspondence between module IDs and respective processing modules. FIG. 7 is a diagram showing command codes at the time of bus diagnosis and normal operation, and a bus diagnosis return control based on the command codes. FIG. 6 is a diagram illustrating an example of correspondence with an operation mode of a unit 311. Examples of commands such as return diagnosis for each bit line from the address bus and data bus to the diagnostic line return highway, return diagnosis to all buses from the diagnostic line control highway, and normal operation are shown.
Specifically, command codes 00 (H) to
3F (H) is a command for the diagnostic module to instruct the processing module to sequentially extract a diagnostic pattern for each of the 0-31 bit lines of the address bus and the data bus and to return the diagnostic pattern to the diagnostic line return highway, The command code 40 (H) is a command for the diagnostic module to instruct that the diagnostic pattern from the diagnostic line control highway be folded and inserted simultaneously or sequentially into the bit lines of all buses. Command code 4 during normal operation
1 (H) to are commands for canceling the diagnostic mode. The diagnostic module determines the location of the failure by comparing the diagnostic pattern returned from the processing module with the transmitted diagnostic pattern at the return route and timing specified by the command code.

[0032]

According to the shared bus failure diagnosis of the present invention, the pattern return diagnosis of the common bus between the diagnosis module and each processing module can be performed by switching the return route. When a failure occurs in the connected shared bus, it is possible to isolate the failure part in detail, and it becomes possible for the maintenance person to easily perform the failure analysis and the recovery from the failure.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of a method and an apparatus for diagnosing a shared bus failure according to the present invention.

FIG. 2 is a block diagram showing an embodiment of an apparatus to which a shared bus fault diagnosis method according to the present invention is applied.

FIG. 3 is a block diagram illustrating an embodiment of a diagnostic loopback function unit.

FIG. 4 is a diagram showing a timing chart of a diagnostic line and an address / data bus in FIG. 3 in an example of a bus diagnostic operation.

FIG. 5 is a diagram showing a timing chart of a diagnostic line and an address / data bus of FIG. 3 in another example of the bus diagnostic operation.

FIG. 6 is a diagram showing an example of correspondence between processing modules and module IDs in FIGS.

FIG. 7 is a diagram showing an example of the correspondence between the operation of the bus diagnosis loopback control unit and command codes in FIGS.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 Shared bus 102 Diagnostic line 103 Diagnostic module 104 Processing module 110 Bus diagnostic function unit 111 Diagnostic return function unit 201 Address bus 202 Data bus 203 Diagnostic line return highway 204 Diagnostic line control highway 211 Diagnostic pattern sending unit 212 Diagnostic pattern matching unit 213 Bus Diagnostic function control unit 214 Diagnostic pattern return unit 215 Diagnostic return function control unit 301 Module external address / data signal line 302 Clock / frame pulse signal line 303 Module internal address / data signal line 311 Bus diagnostic return control unit 312 Bus diagnostic input selection unit 313 bus diagnostic output selector 314 bus input / output interface

Claims (6)

[Claims] 1. A method of diagnosing a shared bus fault in a processing device in which a diagnostic module and a plurality of processing modules are connected to a shared bus and a diagnostic line, wherein the diagnostic module is configured to perform each of the diagnostic modules via the shared bus or a diagnostic line. The diagnostic module transmits diagnostic control information and a diagnostic pattern to a processing module, and the processing modules return the diagnostic pattern received via the shared bus or the diagnostic line via the diagnostic line or the shared bus, and The module receives the diagnostic pattern looped back to the diagnostic line or the shared bus, and compares the transmitted diagnostic pattern with the looped-back diagnostic pattern to isolate a fault location between the shared bus and the processing module. A method for diagnosing a shared bus failure, characterized in that: 2. The diagnostic line includes a diagnostic line control highway and a diagnostic line return highway. The diagnostic module transmits the diagnostic pattern to the shared bus or the diagnostic line control highway. ,
The diagnostic method according to claim 1, wherein the diagnostic pattern received from the shared bus is returned to a diagnostic line return highway or the diagnostic pattern received from the diagnostic line control highway is returned to the shared bus. 3. The shared bus comprises an address bus and a data bus, and the diagnostic module switches a return route of each of the processing modules, so that the address bus and the data between the diagnostic module and each of the processing modules are switched. 3. The shared bus fault diagnosis method according to claim 1, wherein a pattern loopback diagnosis is performed for each signal line of the bus, and a fault location of the shared bus and each of the processing modules is isolated. 4. A shared bus fault diagnostic device for a processing device in which a diagnostic module and a plurality of processing modules are connected to a shared bus and a diagnostic line, wherein the diagnostic module includes a diagnostic pattern on the shared bus or the diagnostic line. And a bus diagnostic function unit for isolating a fault location between the shared bus and the processing module by comparing the diagnostic pattern with the diagnostic pattern received from the diagnostic line or the shared bus. The shared bus fault diagnostic device, wherein the module has a diagnostic return function unit that sets a return route of the diagnostic pattern between the shared bus and the diagnostic line and returns the diagnostic pattern. 5. The diagnostic line includes a diagnostic line control highway and a diagnostic line loopback highway, wherein the bus diagnostic function unit sends a diagnostic pattern to the shared bus or the diagnostic line control highway, and the diagnostic loopback function. The unit sets the return route so that the diagnostic pattern received from the shared bus is returned to the diagnostic line return highway or the diagnostic pattern received from the diagnostic line control highway is returned to the shared bus. The shared bus fault diagnosis device according to claim 4. 6. The address bus and the data bus between the bus diagnostic function unit and each processing module by the diagnostic module switching a return route of the diagnostic return function unit, wherein the shared bus comprises an address bus and a data bus. 6. The shared bus fault diagnosis apparatus according to claim 4, wherein a pattern loopback diagnosis is performed for each signal line of the bus, and a fault location of the shared bus and each processing module is separated.