JPS5836367B2 - Power supply method for input/output control equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a system for supplying power to prevent a system down due to power cutoff of an input/output control device.

A power supply connection to an input/output control device that is conventionally controlled by time division is as shown in FIG.

That is, a central processing unit suitable for containing channels is the CCO.
, CCI, ......There are multiple input/output control devices like CCn, which control a common input/output control device IOC, and the IOC includes a typewriter TYP and a magnetic tape MT.
Multiple input/output devices such as are connected.

PWO, PW1,...PWn indicates each power supply belonging to the central processing unit, and IPW indicates the input/output control unit IOC.
Indicates the power supply for the

When one of the central processing units is accessing the input/output device via the input/output control device, the other central processing units are on standby.

The input/output control unit power supply IPW is normally completely separate from the power supply belonging to the central processing unit.

This is because if all the power supplies are shared, the entire system will go down in the event of a failure.

However, in FIG. 1, if the power source IPW is cut off, the system will go down even if the power source of the central processing unit is normal.

Therefore, in a system in which the input/output devices under the input/output control device IOC are controlled in a time-sharing manner from each central processing unit via the input/output control device IOC, it is necessary to select an expensive power source IPW that is less likely to fail. was there.

An object of the present invention is to improve the above-mentioned drawbacks, and to provide a power supply system with a simple configuration in which power is supplied to an input/output control device from a power source belonging to a central processing unit that accesses an input/output device among a plurality of central processing units. is to provide.

Embodiments of the present invention shown in the drawings will be described below.

The first embodiment shown in FIG. 2 is the simplest case in which two central processing units control a single input/output control unit.

In Figure 2, the same symbols as in Figure 1 indicate the same things,
FF is a path flip-flop, RL is a relay in the input/output control device, DR is a circuit that drives relay RL, and rl is a contact point of relay RL.

The operating power supplies for the path flip-flop FF and the relay drive circuit DR are built-in since they only need a small capacity.

The path flip-flop indicates the state of which central processing unit is capable of controlling the input/output control device, and its state can be reversed by control from either central processing unit.

However, it cannot be reversed by an input/output device activation command (SIO command) or the like.

One central processing unit, for example CCO, is an input/output control unit IO
Immediately before starting a control operation for exchanging data with an input/output device via C, the state of the flip-flop FF is inverted using the signal path SGR.

For example, if the drive circuit DR connected to the reverse side of the flip-flop is configured to be energized, the relay RL will operate.

Therefore, the relay contact rl is switched to the central processing unit CCO side, and thereafter, the input/output control unit IOC performs its original operation, that is, a predetermined control operation for the input/output devices under its own control, by the power supply PWO of the central processing unit CCO.

For example, when the input/output control device IOC is a floppy disk control device, the operating power source requires DC voltage sources of different voltages such as +5V and +12V.

According to the above embodiment, if the memory power supply line +12■ in the central processing unit CC is switched at the same time as the route is switched, +12V can be supplied to the input/output control unit IOC, and +1
2. There is no need to provide a special power source.

FIG. 3 shows another embodiment of the invention in which more central processing units control a single input/output controller IOC.

In this case, the path flip-flop FF shown in FIG. 2 is provided in each central processing unit CC to indicate whether or not the central processing unit is controlling the input/output control device.

DL indicates a relay controlled by the flip-flop, and dl indicates its contact.

Therefore, when a central processing unit, such as a CCO, controls the input/output control unit IOC, it sets FFO and controls the IOC.
When a signal indicating control is given to relay DL, contact dl
o is closed and power is supplied to the input/output controller IOC.

In this case, the input/output control device IOC can start operating when power is supplied, and the flip-flop F
There is no need to prepare an operating power source for F, and the input/output control device side is simpler than in the case of FIG.

The above description is based on the case where there is a single input/output control device, but if multiple control devices are provided, each input/output control device can be operated in the same manner as in the illustrated example by giving appropriate instructions from the central processing unit. can.

In this way, according to the present invention, there is no need to provide the input/output control device with its own power supply, and therefore, the input/output control device always operates when connected to an operable central processing unit. The system will not go down due to a power outage.

Therefore, there is no need to prepare an expensive power source for the electronic computer system, and the configuration can be simple and inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a diagram explaining a conventional power supply system, and FIGS. 2 and 3 are configuration diagrams showing each embodiment of the present invention. CC... Central processing unit, ICO... Input/output control device, PW, IPW... Power supply, FF.
...Flip-flop, RL, DL...
Relay, rl, dl...contact.

Claims (1)

[Claims] 1. In a system in which a plurality of input/output devices are controlled from a plurality of central processing units via an input/output control device provided in common, a certain central processing unit among the plurality of central processing units When using the input/output control device, immediately before the start of a control operation for exchanging data with the input/output device via the input/output control device, the input/output is activated from the power supply section belonging to the certain central processing unit. A power supply method for an input/output control device characterized by supplying power to the output control device.