JPH0588787A - Duplex data processor - Google Patents

Abstract

PURPOSE:To shorten time required for obtaining the state information of the data processor on the other side through a bus intersection circuit connecting the bus of the duplexed data processor. CONSTITUTION:The electric power source disconnection information of a data processor 10 is directly written and stored in a register 28 of a data processor 20 on the other side by an electric power source disconnection detection circuit 27, and the internal state information is directly written and stored through a bus 15 by a central processing unit 11. A register 18 stores the electric power source disconnection information and the state information on the other side, and the central processing unit 11 executes the prescribed processing by directly reading the storage information of the register 18 through the bus 15 and recognizing the state on the other side. Thus, it is not necessary to provide the conventional bus intersection circuit and a means requiring the time for interrupt procedure when the duplex data processor acquires the state on the other side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention duplicates a data processing device having a central processing unit, a main storage unit, an input / output control unit connected by a bus, and a power supply unit for supplying power to these units, and the data processing unit is duplicated. The present invention relates to a dual data processing device in which a bus crossing circuit connects the buses of both devices and transfers data to each other.

[0002]

2. Description of the Related Art Conventionally, a dual data processor of this type has a bus for connecting the central processing unit of one data processing unit and the other data processing unit to each other in terms of fault tolerance and system configuration management. Recognize by the status information returned to the order sent to each device of the other data processing device via the crossing circuit, and in particular, in the case of a critical failure such as power failure, an interrupt operation from the individual notification line, etc. It is essential to know the state of the device.

[0003]

SUMMARY OF THE INVENTION In the above-mentioned conventional duplex data processing device, in order to recognize the state of the other data processing device, both central processing devices are operated via a bus crossing circuit or individually interrupted. Since it is configured to operate, it takes a long time to connect and obtain data information, such as temporary queuing by a bus crossing circuit or competition operation, which causes a decrease in the processing performance of the data processing device. There was a problem.

An object of the present invention is to operate a central processing unit on the side of occurrence when a serious failure occurs to temporarily store data information in a register via a bus, and drive the central processing unit on the other side to register this register. An object of the present invention is to provide a duplicated data processing device that solves the above-mentioned problems by processing the data information accumulated and held by the.

[0005]

A duplex data processing apparatus according to the present invention is a data processing apparatus having a central processing unit, a main storage unit, an input / output control unit connected by a bus, and a power supply unit for supplying power to these units. Dualize
In a duplicated data processing device in which a bus crossing circuit is coupled between the buses of both data processing devices to transfer data to each other, a power failure detection circuit for detecting power failure of each data processing device and a power supply from this detection circuit. In addition to receiving a power failure detection notification as a power failure information, the central processing unit of the data processing apparatus that is the source of this notification writes the status information of this data processing apparatus directly via the bus, and stores two registers for storing these status information. The central processing unit has means for reading the stored information directly from the register for storing the power-off information and the status information of the data processing unit of the other party at a predetermined time and executing the predetermined processing. Have.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a functional block diagram showing an embodiment of the present invention.

As shown, the data processing device 10, 20
Both constitute a set of duplicated data processing device.

The respective data processing devices 10 and 20 are
It has central processing units 11 and 21, main storage units 12 and 22, input / output control units 13 and 23, and bus crossing circuits 14 and 24 for a duplicated structure, which are connected by buses 15 and 25. The bus crossing circuits 14 and 24 are connected by a bus crossing line 30 and perform data transfer between them.

The data processing devices 10 and 20 are further provided with power supply devices 16 and 26 for supplying power to the devices, and a partner data processing device 2.
Power failure detection circuits 17 and 27 for detecting current interruptions of the power supply devices 26 and 16 of 0 and 10, and the detection circuits 17 and 27
It has the registers 18 and 28 for receiving and storing the power-off detection information of (1) and writing the data information from the central processing units (21, 11) via the buses (25, 15) of the partner data processing units (20, 10) and temporarily storing the data information.

That is, the register 18 receives and stores the bit information when the power supply device 26 of the partner data processing device 20 is powered off from the power failure detection circuit 17 and stores the data of the data processing device 20 which is powered off. Information can be stored by a write operation from the central processing unit 21.

On the other hand, the central processing unit 11 sends an order to the input / output control unit 13 and the like via the bus 15 and receives the status information returned, so that the status information and its own status are used as the counterpart data processing apparatus. 20 registers 20 are written and stored via the bus 15.

Similarly, the register 18 receives writing and storing of status information from the central processing unit 21 of the partner data processing unit 20.

Since the central processing unit 11 periodically reads the contents stored in the register 18 via the bus 15, the state of the partner data processing unit 20 can be confirmed together with the normality and the processing can be continued.

Such an operation is also the same for the central processing unit 21 and the register 28 of the partner data processing unit 20.

In the above-described embodiment, the power cutoff detection circuit and the register are shown and described as being provided in the data processing device of the other party for notifying and storing, but in principle, they may be provided in any of them, and external You may have as a common control apparatus. However, if the device on the reading side is provided with a register as in the embodiment, there is an advantage that this state can be read even if the external state is not stored.

Further, although it has been described that the central processing unit periodically reads the stored information from the register, the central processing unit may read the stored information at a predetermined time.

As described above, in the present embodiment, the processing amount of the central processing unit on the other side increases, but in the case of the general operation / standby method, the processing amount at the time of standby is larger than that at the time of operation. Since it is very small, the processing capacity of the data processing device can be improved overall.

[0018]

As described above, the present invention is provided with a register for storing the power-off information of one data processing unit and the status information directly written by the central processing unit via the bus. The data information stored in the central processing unit of the other data processing device to be connected is read and processed at a predetermined time, and each recognizes the operating state of the data processing device on the other side, so Since it is possible to eliminate the time until the acquisition of the status information of the data processing device on the other side, such as the conflict processing in the temporary waiting and the interrupt operation, it is possible to improve the data processing performance.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing an embodiment of the present invention.

[Explanation of symbols]

 10,20 Data processing device 11,21 Central processing device 12,22 Main memory device 13,23 Input / output control device 14,24 Bus crossing circuit 15,25 Bus 16,26 Power supply device 17,27 Power failure detection circuit 18,28 Register 30 Bus crossing line

Claims (1)

[Claims] 1. A data processing device having a central processing unit, a main storage device, an input / output control device connected by a bus, and a power supply device for supplying power to these devices is duplicated.
In a duplicated data processing device in which a bus crossing circuit is coupled between the buses of both data processing devices to transfer data to each other, a power-off detection circuit for detecting power-off of each data processing device and a power supply from this detection circuit. In addition to writing the power failure information as a power failure information, the central processing unit of the data processing device that is the source of the notification writes the status information of this data processing device directly through the bus, and two registers for storing these. The central processing unit has means for reading the stored information directly from the register for storing the power-off information and the status information of the partner data processing apparatus at a predetermined time through the bus and executing the predetermined processing. A duplicated data processing device having.