JPH0454549A - Data transfer system - Google Patents

Abstract

PURPOSE:To attain a degenerating operation without stopping the entire working of a large scale system despite a trouble of an input/output device and at the same time to improve the overall throughput of a system by securing the connection between a CPU and an input/output device via a bus and using the different power supplies to the CPU and the input/output device respectively. CONSTITUTION:When an input power supply is applied to an input/output device 2 which is kept in an OFF state, a bus control part 13 turns on a power status signal at rise of the supplied power and outputs a power ON interruption. A CPU 7 recognizes the power ON interruption received from the device 2 via a control part 12 to reset this interruption and sets a state where the power OFF interruption can be accepted from the device 2. Then the input/output devices 8 and 9 contained in the device 2 are initialized and a data transferable state is set. As a result, a degenerating operation is attained without stopping the entire working of a large scale system despite a trouble of the device 2. Furthermore the overall throughput of the system is improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a data transfer system, and particularly to a central processing unit and It relates to a data transfer method between the input/output device.

[Conventional technology]

Conventionally, the power for the central processing unit and the input/output unit of a central processing unit system in which data transfer is performed may be supplied from the same power supply device, or may be supplied from separate power supply devices.

[Problem to be solved by the invention]

In the conventional central processing unit system described above, when a failure occurs in the input/output unit while power is being supplied to the central processing unit and the input/output unit from the same power supply unit, the power to the central processing unit is turned off. As the number of input/output devices increases, if a failure occurs in the input/output device, system operation becomes difficult and the entire system has to be stopped. There is a problem.

In addition, when power is supplied to the central processing unit and the input/output unit from separate power supplies, the central processing unit is also installed in the input/output unit, and data is transmitted by connecting the two central processing units with a serial interface. Since data transfer is performed according to a procedure, there is a problem in that when data transfer is performed, the load on the central processing unit increases and the throughput of the entire system decreases.

An object of the present invention is to provide a data transfer method that enables degenerate operation without stopping the entire large-scale system even when an input/output device fails, and that can increase the throughput of the entire system.

[Means to solve the problem]

The data transfer method of the present invention includes a central processing unit and a plurality of input/output device units, and in which data transfer is performed between the central processing unit and the plurality of input/output device units, the data transfer method includes a central processing unit and a plurality of input/output device units. The device and the plurality of input/output device sections are connected by a bus, and the central processing unit and the plurality of input/output device sections are each provided with an independent power supply, and the power supply from the input/output device section to the input/output device section is provided. The power supply status information indicating the status is outputted, and this is taken in by the central processing unit to control data transfer for each input/output device unit.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram of an embodiment of the present invention, and FIG. 2 is a time chart when power is turned on and off in the data transfer method shown in FIG. 1.

In FIG. 1, 1 is a central processing unit, 2 and 3 are input/output device units, 4 to 6 are power supplies, 7 is a central processing unit, 8 to 11 are input/output devices, and 12 is a bus control for the central processing unit. Part, 13
．． Reference numeral 14 indicates a bus control section of the input/output device section, 15 indicates an internal bus of the central processing unit section, 16 indicates an expansion bus, and 17 and 18 indicate internal buses of the input/output device section.

Next, the operation will be explained.

In FIG. 1, when the input power of the power supply unit W4 is turned on and power is supplied to the central processing unit 1, the central processing unit 7
Now perform initial processing. Moreover, the central processing unit 7
In order to know the power supply status of each input/output device unit 2, 3, a power status signal is taken in via the bus control unit 12,
Initial processing is performed for the input/output device section while the power is on, and it is possible to accept power-off interrupts, and it is also possible to accept power-on interrupts for the input/output device section while the power is off. Make it.

For example, as shown in FIG. 2, when input power is supplied to the input/output device section 2 that is powered off, when the supplied power is turned on, the bus control section 13 turns on the power status signal and turns on the power supply. Outputs on interrupt. Central processing unit 7
recognizes the power-on interrupt output from the input/output device section 2 via the bus control section 12, resets the power-on interrupt of the input/output device section 2, and resets the power-off interrupt of the input/output device section 2. The receiver will be ready for installation. Then, the input/output device 8 and the input/output device 9 in the input/output device section 2
Initial processing is performed, and data transfer is then possible.

Further, as shown in FIG. 2, when the input power to the input/output device section 2 is turned off, the power supply device 5 detects this and outputs a power off interrupt via the bus control section 13, and also outputs a power off interrupt via the bus control section 13. Turn off the status signal. The central processing unit 7 detects a power-off interrupt via the bus control unit 12, prohibits data transfer from the input/output device unit 2 before the output voltage of the power supply 5 drops, and transfers input data from the expansion bus 16. The output device section 2 is disconnected and the power-on interrupt can be accepted again.

In this way, by bus-coupling the central processing unit and the input/output device section and using separate power supplies for the central processing unit and the input/output device section, the entire large-scale system can be maintained even in the event of an input/output device failure. This has the effect that degenerate operation is possible without stopping the system, and the throughput of the entire system can be increased.

〔Effect of the invention〕

As explained above, the present invention connects the central processing unit and the input/output device section by bus, and separates the power supply between the central processing unit and the input/output device section, thereby maintaining a large-scale system even in the event of an input/output device failure. This has the effect that degenerate operation is possible without stopping the entire system, and the throughput of the entire system can be increased.

Okibe's internal bus.

Claims (1)

[Scope of Claims] 1. A data transfer method comprising a central processing unit and a plurality of input/output device units, in which data is transferred between the central processing unit and the plurality of input/output unit units, wherein the central processing unit The device and the plurality of input/output device sections are connected by a bus, and the central processing unit and the plurality of input/output device sections are each provided with an independent power supply, and the power supply from the input/output device section to the input/output device section is provided. A data transfer method characterized by outputting power supply state information indicating a state, capturing this by the central processing unit, and controlling data transfer for each input/output device unit. 2. The data transfer method according to claim 1, wherein the power state information is a power-on interrupt, a power-off interrupt, and a power status signal.