JPS6248146A - Data processing device - Google Patents

Abstract

PURPOSE:To attain a fault detection and quick fault recovery by providing a control means instructing the changeover of a prescribed bus driver and a spare bus drive power supply to a power source control means and instructing the selection of a data signal inputted to the bus driver to a select means. CONSTITUTION:When it is not discriminated to be the fault of a specific bus driver, a bus driver seeming to be most doubtful is disconnected from a data bus 5 and its effect is checked. If a fault takes place similarly before the disconnection, it is decided that a faulty bus driver is not a bus driver 32, the power supply of the bus driver 32 is turned on newly, the power supply of a doubtful bus driver is turned off to disconnect sequentially a bus driver seeming to be faulty from the data bus 5 and to confirm the presence of the fault thereby troubles shooting the faulty bus driver. Thus, the fault detection and diagnosing capability of the bus driver is improved and the fault is restored quickly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fault diagnosis circuit for a hash driver provided on a data bus of a data processing device.

〔overview〕

The present invention provides a data processing device that outputs data signals from a plurality of data modules to a data bus via their respective bus drivers and performs data transfer. By turning the bus driver off and diagnosing the fault, and switching the faulty bus driver to a spare driver, it is possible to detect a fault in the bus driver on the data bus and quickly recover from the fault. .

[Conventional technology]

In a conventional data processing device, when a failure occurs in one bus driver on the data bus, the failed bus driver can be identified using the data signal on the data bus, the input data signal of each hex driver, and the hex output enable signal. This is done based on the information.

[Problem that the invention seeks to solve]

However, in such conventional data processing devices, if a failure occurs in the enable system of the bus driver, the corresponding bus driver becomes "on" regardless of whether the bus output enable signal is "on" or "off", and data is lost. When undefined data is output on the bus, normal data signals from other bus drivers collide with each other on the data bus, so an abnormality is detected on the data bus, but all input signals of each bus driver are normal. Therefore, there was a drawback that it was difficult to identify the bus driver that caused the failure.

Furthermore, even if a faulty bus driver is identified, it is impossible to control the bus output enable signal, so equipment is required to replace the bus driver in question in order to return the data processing device to a normal state. During this period, the data processing equipment had the disadvantage of being inoperable.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks, and an object of the present invention is to provide a data processing device that can detect a failure in a bus driver on a data bus and quickly recover from the failure.

[Means for solving problems]

The present invention provides a data processing device equipped with a plurality of bus drivers that input a plurality of data signals and output them to one data bus. a selection means for selecting and supplying the power to the spare bus driver; a power control means for independently selecting and turning on/off the power of the plurality of bus drivers and the spare bus driver; The present invention is characterized by comprising bus driver control means for instructing power on/off of the bus driver and the spare bus driver, and for instructing the selection means to select a data signal to be input to the bus driver.

[Effect]

The present invention provides a processing device that transfers data between a plurality of modules via a data bus. a bus driver for each module, a power control means that can independently turn on and off the power to the spare lotus driver, and an external control 11. A lotus driver control means for instructing the power supply control means to turn on or off the power of a predetermined lotus driver, switching each input signal of a spare bus driver, and instructing the power supply to be turned on or off by means of a signal; If a failure occurs in the bus driver connected to the data bus, the external control means disconnects the bus driver from the data bus by turning the power on or off to the bus driver for each module. By separating and disconnecting the iH and switching with the pre-installed hash driver, it is possible to easily diagnose a fault in the hess driver on the data bus and quickly recover from the fault.

〔Example〕

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

The figure is a block diagram of a data processing device according to an embodiment of the present invention.

Here, the feature of the present invention is the bus driver failure diagnosis portion surrounded by a dashed line. That is, an external control signal S, not shown, is connected to the input of the bus driver control section 1. A power supply signal S2 is connected to the power supply control section 2 from outside the figure. A selection control signal Sz is connected from the bus driver control section 1 to the power supply control section 2 . Input data signal SSI~S
S3 is branched and connected to each input of the selector 6.

Further, path output enable signals 861 to S63 are branched and connected to respective inputs of the selector. A selection control signal S7+ from the lotus driver control section 1 is connected to a selection control input of the selector 6.7. Input data signals 851 to S51 are selected from the selector and connected to the spare bus driver 4 as input data signals Sel. Also selector 7
A lotus output enable signal S91 corresponding to the input data signal Sol to S53 selected from the spare bus driver 4
and receives power signals 5ffl to S3 from the power supply control unit 2.
3 and S4° are selected respectively and the bus drivers 3I to 3
3 and the power signal input of the spare bus driver 4.

Input data signals SSI to SS3 from outside the figure are input to bus driver 3. ~33, respectively. Driver output enable signals 861-S, 3 from outside the diagram are bus drivers 31-
33 and the enable signal input of the selector 7, and the output data from the bus driver 3 to which power is supplied is connected to the data bus 5, and the input data signals SSI to SS3 are selected from the spare bus driver 4, and the data bus 5
connected to.

The operation of the data processing device having such a configuration will be explained. In the figure, when a fault is detected on the data bus 5, the input data signals SSI to S53 of the bus drivers 31 to 33 of each module and the bus output enable signal S
61"S6+, and if it is clearly determined that a specific bus driver, for example, the bus driver 31, is malfunctioning, turn off the power to the corresponding bus driver 3I, disconnect it from the data bus 5, and replace it with The external control signal S1 instructs the bus driver control unit 1 to turn on the power of the spare north driver 4 and connect it to the data bus 5. The bus driver control unit 1 issues a selective 3 output signal S7+ to the selector 6 and the selector 7, and the selector 6 and the selector 7 send the input data signal Set of the spare bus driver 4 and the hash output enable signal S91 to the input of the bus driver 31. The input conditions of the spare bus driver 4 are made the same as those of the bus driver 31 by connecting them to the data signal SSI and the bus output enable signal S61, respectively.

It also instructs the power control unit 2 to turn off the power to the bus driver 31 and turn on the power to the spare bus driver 4. The power supply control unit 2 disconnects the power supply signal Sel+ of the bus driver 3° according to an instruction from the bus driver control unit 1, and also connects the power supply signal 340 of the spare bus driver 4 to the power supply signal S2.

As a result, bus driver 31 is completely electrically disconnected from data bus 5, and spare bus driver 4 is newly connected. Thereafter, the data processing device can start operating normally.

On the other hand, the input data signal SSI""S! of the bus drivers 31 to 33 of each module! +1 and the bus output enable signal S61""S63, and if it cannot be determined that the failure is in a specific bus driver, select the most suspicious bus driver, for example bus driver 3□
In order to disconnect from the data bus 5 and examine its effect,
The external control signal S instructs the bus driver control unit 1 to turn off the power to the bus driver 3□. The bus driver control section 1 provides a bus driver 3 for the power supply control section 2.
2. Instructs to turn off the power. According to the instruction, the power supply control section 2 cuts off the power supply signals S and 2 of the bus driver 3□. As a result, the bus driver 3□ is completely electrically disconnected from the data bus 5. Here, a diagnostic program etc. is executed to monitor each input signal on the data bus 5 and the bus drivers other than the disconnected bus driver 3゜, and if no failure occurs, a failure has occurred in the disconnected bus driver 3□. The source can be confirmed. However, if the failure still occurs even if the bus driver 3□ is disconnected, it can be determined that the bus driver that caused the failure is not the bus driver 3□. In that case, turn on the power to bus driver 3□ again.
Then, using the external control signal SI, the bus driver control unit 1 is instructed to turn off the power of the bus driver that is considered to be suspicious.

By sequentially disconnecting the bus drivers that are thought to have caused a failure from the data bus 5 and checking whether or not a failure has occurred, it is possible to locate the bus driver that has caused the failure. As a result, if the bus driver that caused the failure is discovered, the power of the bus driver in question is turned off, the power of the spare bus driver 4 is turned on, and the human data signal is transferred to the bus driver that caused the failure. The external control signal S instructs the bus driver control section 1 and the power supply control section 2 to connect to the input data signal of Data processing can then resume normally.

In addition, if it is not possible to identify the faulty lotus driver and diagnosis cannot be performed with the bus driver disconnected from the data bus 5 due to the relationship between the diagnostic program and the functions of the bus driver, then disconnect the corresponding lotus driver and start the process from the beginning. It is also possible to connect the backup path driver 4 to the data bus 5 instead of the corresponding bus driver, check for the occurrence of a failure, and select the failed bus driver.

〔Effect of the invention〕

As explained above, the present invention enables the bus driver and spare bus driver of each module on the data bus to be turned on and off independently using an external control signal.
By electrically disconnecting from the data bus and making connections in a simple manner, there is an excellent effect of improving the failure detection and diagnosis ability of the bus driver and quickly recovering from the failure.

[Brief explanation of the drawing]

The figure is a block diagram of a data processing device according to an embodiment of the present invention. ■... Bus driver control section, 2... Power supply control section, 3
, ~33...Bus driver, 4...Preliminary driver, 5...Data bus, 6.7...Selector, S...
...External control signal, S2...Power supply signal, S11.
57+...Selection control signal, 5ffl"'5ff3.3
40 ”'Power signal, SSI~SSI, 5111...
Input data signal, s6+-si, 3, S91... bus output enable signal.

Claims (1)

[Claims] (1) In a data processing device equipped with a plurality of bus drivers that each input a plurality of data signals and output them to one data bus, a spare bus driver connected to the data bus, a selection means for selectively applying power to the spare bus driver; a power control means for independently selecting and turning on/off the power of the plurality of bus drivers and the spare bus driver; A data processing device comprising bus driver control means for instructing power on/off of the driver and the spare bus driver, and instructing the selection means to select a data signal to be input to the bus driver. .