JPS6029988B2 - Multiple control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control method for channels, input/output control devices, input/output devices, etc. in a data processing system, and particularly relates to a multiplex control method for improving channel processing performance.

FIG. 1 shows the configuration of a data processing system according to the present invention. In the figure, the input/output device 6 is a keyboard, a display, a printer, a code reader, a card punch, a communication control device, a multifunction terminal system, etc.

Conventionally, the channel 2 is connected to the input/output control device through one input/output control device (for example, IOCI) among the plurality of input/output control devices 4 connected to the channel 2. When you start up to select one of the multiple input/output devices 6 (for example, DV, .), the input/output device (DV, .) will display a message indicating that the specified selection has been completed after a certain period of time has elapsed. Until the notification is received, even if other input/output devices (DV, . to DV, m) issue processing requests such as data transfer or status transfer, the system waits. For this reason, the input/output devices DV, . If it takes a long time to complete the selection after being activated, even if other input/output devices issue processing requests such as data transfer or status transfer during this period, they will be put on hold, resulting in data overrun of the input/output device. Another drawback was that command overruns were likely to occur.

The purpose of the present invention is to start up one input/output device with a channel, and then process requests such as data transfer generated by other input/output devices during the waiting time until that input/output device completes the selection operation. An object of the present invention is to provide a multiplex control system that receives and processes data, improves the operating efficiency of channels, and reduces the occurrence of data overruns or command overruns of input/output devices.

In the present invention, the sequence for starting the input/output device, which conventionally treated the period from starting the input/output device to completing the selection operation and confirming that as one sequence processing unit, and a sequence to confirm that the selection operation of the input/output device is completed, and when the channel activates the input/output device, one person in charge releases the input/output device, and the reception of the input/output device is performed by another. This is done by providing means for accepting processing requests such as data transfer from input/output devices with the same priority.

Hereinafter, a more detailed explanation will be given based on an embodiment of the present invention shown in FIG.

FIG. 2 shows channel 2 (hereinafter referred to as CH), input/output control device 4 (hereinafter referred to as IOC), and input/output device 6 (hereinafter referred to as DV).
) between CH and IOC, various signal lines 3-1, 3-2, 3-3, 3-4, 3-5 and data bus lines 3-6 are connected between CH and IOC. It is shown.

10〇This is n input/output devices 6-1 to 61n (hereinafter referred to as D
V, ~DVn) are connected, and various signal lines 5-11, 5-12, 5-13,
5-14, 5-15 and common line 5-6 are shown.

When CH activates DV, via IOC, DV,
The activation signal for is transmitted through the signal line 3-1, IOC register 4-1, IOC decoder 4-2, and signal line 5-11.

In response to the activation signal, the DV starts the selection operation. At this point, in the conventional method, the CH continues to be coupled with the DV until it receives a selection completion notification from the DV, but in the method according to the present invention, the coupling with the DV is released at this point, and the CH continues to be coupled with the DV. Enters the boring state to accept data transfer requests or status transfer requests from input/output devices.

The selection completion notification, data transfer request, and status transfer request signals sent from each DV to the CH via the IOC are as follows:
The reception priority circuit 4-3 of the IOC has the function of selecting one DV to be accepted by the CH according to the order of the times in which the signals are generated. In the bowling state described above, for example, if a data transfer request is issued from DV2 and then a status transfer request is issued from DV5, the reception priority selection circuit 4-3 of the IOC selects the DV2 with the higher priority and selects the function of the DV2'. Set the number in the register 4-4 of the IOC, and connect it to the CH through the signal lines 3-2.
It is also transmitted to DV2 through the decoders 4-5 and signal lines 5-25 of the IOC, and thereafter data transfer processing of DV2 is performed according to the normal sequence, and the boring state is entered again.

Next, the reception priority selection circuit 4-3 of the IOC accepts the status transfer request from the DV5, processes it in accordance with the above, and then enters the bowling state again. Next, at this point, if the selection operation of the DV that was activated earlier is completed,
If a selection completion notification to this effect occurs before a data transfer request or status transfer request from another input/output device, the reception priority circuit 4-3 of the IOC selects the DV, and selects the DV. The number is set in the register 4-4 of the IOC, and then transmitted to the CH through the signal line 3-3. After the selection completion process is completed, the IOC enters the boring state.

Further, when the CH confirms that the selection of the DV has been completed, the CH prepares to execute the next processing sequence for the DV.

As described above, according to the control method of the present invention, after a CH starts up an input/output device, it disconnects from the input/output device, and then determines that the input/output device has completed the selection operation. For confirmation, by using a method that accepts processing requests such as data transfer issued from other input/output devices with the same priority, the channel is occupied by the input/output device during the samurai time after startup until the selection operation is completed. During this time, processing requests from other input/output devices that can be connected to the CH can be accepted and processed, thereby improving the operating efficiency of the CH and preventing data overruns and command overruns of input/output devices. The occurrence of runs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a data processing system according to the present invention;
FIG. 2 shows an embodiment of the present invention. 1... Processing device (CPU), 2... Channel (CH),
3... Input/output control device (IOC), 6... Input/output device (
DV). Illustration of the lacquer scheme

Claims (1)

[Claims] 1. In a data processing system equipped with a channel, an input/output control device, and a plurality of input/output devices, after the channel activates a predetermined input/output device via the input/output control device, the input/output device The input/output control device is provided with means for accepting a request for notification of completion of selection with the same priority as a processing request such as data transfer generated by an input/output device other than the input/output device, and the channel is configured to After starting up the predetermined input/output device via the input/output control device, the connection state with the input/output device is released, and the device provided in the input/output control device activates the input/output device. 2. A multiplex control system, characterized in that the completion of selection of the input/output device is confirmed, and requests for data transfer processing, etc. of input/output devices other than the predetermined input/output device can be accepted and processed during this period.