JPH0667923A - Self diagnostic system - Google Patents

Abstract

PURPOSE:To easily self-diagnose a circuit related to data transfer and to improve the fault detection rate of a controller by including feedback circuits connected between a master and a slave and a control circuit controlling connection between drivers/receivers and the feedback circuits. CONSTITUTION:When self-diagnosis is started, a bus control part 7 supplies output suppression signals n1 and n2 to the drivers 41 and 42 and the receivers 51 and 52 so as to invalidate output and supplies a feedback instruction signal 5 to the feedback circuits 61 and 62 so as to validate it. Thus, a bus B and the controller 1 are detached, and a master module 2 and a salve module 3 are connected. At the same time, a response signal b3 which the slave module 3 outputs is inputted to the master module 2 through the beedback circuit 61 as b1. Thus, data is transferred between the master module 2 and the slave module 3. Namley, closed data can be transferred in the controller 1 without affecting the bus B by providing the feedback circuit 61 and 62.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-diagnosis system, and more particularly to a self-diagnosis system in a computer device.

[0002]

2. Description of the Related Art A conventional self-diagnosis system prevents a control device from affecting an external bus during self-diagnosis.
The circuit related to the control of the external bus is not diagnosed, and only the circuit not related to the control of the external bus is diagnosed.

[0003]

However, such a conventional self-diagnosis system as described above cannot diagnose the circuit related to the data transfer with the guard bus, so that the failure detection rate does not increase and the fault detection with the external bus does not occur. If a circuit related to data transfer fails, the failure cannot be detected.

[0004]

In the self-diagnosis system of the present invention, the control device connected to the bus has a module having a master function, a module having a slave function, and the control device interfaces with the bus. Of the driver / resistor and the first control signal exchanged between the master and the bus during the master operation and the second control signal exchanged between the slave and the bus during the slave operation with the master and the slave during the self-diagnosis. It is configured to include a feedback circuit for exchanging data between the driver / regever and the feedback circuit for controlling connection between the driver / regever and the feedback circuit.

[0005]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a system configuration diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing an application example of the embodiment shown in FIG. 1, and FIG. 3 is an operation explanatory view for explaining the operation of the embodiment shown in FIG.

The self-diagnosis system shown in FIG. 1 includes a master module 2, a slave module 3, and a driver 4.
1, 42, receivers 51 and 52, and feedback circuits 61 and 6
2 and a bus control unit 7.

The master module 2 controls the protocol for accessing the resources S1, S2, ..., SN connected to the bus B, and the resources S1, S2 ,.
.., A module that transfers data to the SN.

Now, the master module 2 and the resource SM
When data transfer is performed between and, various control signals a1 (bus request, address line, data line, etc) for controlling data transfer are output, and a response signal b1 from the resource SM is input.

The driver 42 is a driver for outputting the control signal a1 output from the master module 2 on the bus B as the control signal a3 during the master operation.

The receiver 51 is a receiver that outputs a capture control signal b1 from the bus B to the control device 1 as a response signal b2 to the master module 2 in response to the control signal a1 sent from the master module 2.

The slave module 3 receives the resource SM in the control device 1 from the control device CN connected to the bus B.
Is a module that controls the response when there is an access to the control signal CN, inputs various control signals a3 sent from the control device CN, and outputs a response signal b3 to the control signals.

The receiver 52 receives the control signal a2 on the bus B.
Is a receiver for inputting and transmitting to the slave module 3 as a control signal a3.

The driver 41 is a driver for outputting the response signal b3 output from the slave module 3 to the bus B as the response signal b2.

At the time of self-diagnosis, the feedback circuit 62 inputs the control signal a1 output from the master module 2 as a control signal a3 and sends it to the slave module 3.

The feedback circuit 61 outputs the response signal b3 which the slave module 3 outputs in response to the control signal a1 as the response signal b1 during the self-diagnosis. As a result, the transfer equivalent to the transfer performed on the bus B is performed by the master module 2
Between the slave module 3 and the slave module 3.

When the control unit 1 performs self-diagnosis, the bus control unit 7 supplies the output inhibition signals n1 and n2 to the drivers 41 and 42 and the registers 51 and 52 to invalidate the output, and the feedback instruction signal 5 to the feedback circuit. 61, 62 to enable the output. With this, the bus B and the control device 1 are disconnected,
The master module 2 and the slave module 3 are connected.

When the self-diagnosis is not performed, the bus control section 7 does not output the feedback instruction signal, invalidates the outputs of the feedback circuits 61 and 62, does not output the output inhibition signals n1 and n2, and does not output the driver 4
The outputs of the receivers 1, 42 and the receivers 51, 52 are controlled as follows.

During the master operation, the output of the driver 42 is valid and the output of the driver 41 is invalid as shown in FIG.

During the slave operation, the output of the driver 42 is invalidated and the output of the driver 41 is validated as shown in FIG.

Next, the operation at the time of self-diagnosis will be concretely described with reference to FIGS.

When the self-diagnosis is started, the bus control section 7 firstly outputs the drivers 41, 4 by the output inhibition signals n1, n2.
2. The outputs of the receivers 51 and 52 are invalidated, and the outputs of the feedback circuits 61 and 62 are validated by the feedback instruction signal f. As a result, the bus B and the control device 1 are disconnected, and various control signals a1 output by the master module 2 are transmitted to the feedback circuit 6
It is input to the slave module 3 via 2 as a control signal a3.

At the same time, the response signal b3 output from the slave module 3 is input to the master module 2 as a response signal b1 via the feedback circuit 61.

As described above, data can be transferred between the master module 2 and the slave module 3. After that, the master module 2 designates the resources S1, S2, ..., SN address in the slave module 3 and activates the transfer. When the transfer is activated, the master module 2 sends various control signals a1 to the slave module 3, and the slave module 3 recognizes that its resource is referenced from the input address line, and the specified The resource is accessed and the response signal b3 is sent to the master module 2 to transfer the data.

As described above, by providing the feedback circuits 61 and 62, closed data transfer can be performed in the control device 1 without affecting the bus B.

[0027]

In the self-diagnosis system of the present invention, by adding a feedback circuit, the same operation as the data transfer performed on the bus can be performed inside the control device without affecting the bus during self-diagnosis. Therefore, all the circuits related to the data transfer with the bus can be easily self-diagnosed, so that the failure detection rate of the control device can be improved.

[Brief description of drawings]

FIG. 1 is a system configuration diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing an application example of the embodiment shown in FIG.

FIG. 3 is an operation explanatory view for explaining an operation of the embodiment shown in FIG.

[Explanation of symbols]

 1, C1, C2, ..., CN Control device 2 Master module 3 Slave module 41 Driver 42 Driver 51 Receiver 52 Receiver 61 Feedback circuit 62 Feedback circuit 7 Bus control unit S1, S2, ..., SN resource B bus a1 -A control signal b1-b response signal n1-n2 output suppression signal f feedback instruction signal

Claims (3)

[Claims] 1. A master module having a master operating function for initiating a data transfer cycle on a data bus to a controller connected to the bus, and responding to a data transfer initiated by another master connected to the bus. A slave module having a slave operation function, a driver / receiver for the control device to interface with the bus, a first control signal exchanged between the master and the bus during the master operation, and a slave during the slave operation. A period circuit for connecting a second control signal to and from the bus between the master and the slave during self-diagnosis; and a control circuit for controlling the connection between the driver / receiver and the feedback circuit A self-diagnosis system characterized by the following. 2. A master module for issuing a first control signal when starting data transfer and receiving a first response signal in response to the first control signal, and the data transfer being started. Sometimes the second control signal is received and this second
A slave module that issues a second response signal in response to the control signal, a bus controller that issues a first output inhibition signal, a second output inhibition signal, and a feedback instruction signal during self-diagnosis; Of the first output signal is supplied to the bus, and the second response signal is supplied to the bus when the second output output signal is supplied. And a pair of drivers that are prevented from being output, and a third response signal that is supplied from the bus when the first output signal is supplied are suppressed from being output as the first response signal. The feedback instruction signal is supplied with a pair of receivers that are prevented from outputting the third control signal supplied from the bus as the second control signal when the second output suppression signal is supplied. When the first control signal Self-diagnosis system, which comprises a pair of feedback circuit to output as the second control signal and outputting the second response signal as the first response signal. 3. A response signal issued from the slave module in response to the control signal, which is supplied to the slave module instead of being supplied to the bus from the master module when starting data transfer during self-diagnosis. Is supplied to the master module instead of being supplied to the bus during the self-diagnosis.