JPS59146326A - Control system of channel device - Google Patents

Abstract

PURPOSE:To improve the processing speed and simplify the circuit by dividing the processing and the data transfer control of an I/O instruction between two microprograms. CONSTITUTION:A program A 9 controls a CPU 2 and an interface to an I/O device 4, and a microprogram B 7 controls an interface to a main storage device 1. The program A 9 requests the operation to the program B 7 through a control circuit 8 for the microprogram B and detects the operation end of the program B. The program A 9 is operated while monitoring always interfaces between the CPU 2 and a channel device 3 and between the device 3 and the device 4, and the program B 7 is operated by the operation request from the program A 7 or hardware and reporting the operation end to the operation request source after the operation end and is stopped in the microstop state.

Description

Detailed Description of the Invention (a) Technical Field of the Invention The present invention relates to a channel device that controls data transfer between a main storage device and an input/output device according to instructions from a central processing unit, and particularly relates to a channel device that has a simplified circuit configuration. The present invention relates to a control method for a channel device that has high processing speed, and is flexible to changes in device specifications.

(b) Prior Art and Problems Conventional channel devices operate under control only by the hardware configuration or, if a microprogram is used, by only one microprogram. Channel devices controlled only by hardware configuration are not economical due to various inhibiting factors due to the complexity of the two circuits.
Another drawback is that it cannot accommodate changes in the specifications of the device.

In addition, in the case of a channel device controlled by a microprogram, processing of the I10 command and data transfer control cannot be performed simultaneously, resulting in an increase in processing waiting time.

Therefore, data overrun may occur (in data transfer between devices, the speed of one device is so high that the other device cannot transfer data), or the waiting time of the central processing unit will increase. The disadvantage is that it occurs.

(C) Object of the Invention An object of the present invention is to improve the processing speed by sharing the I10 instruction processing and data transfer control between two microprograms, in order to eliminate the above-mentioned drawbacks.

Another object of the present invention is to provide a control method for a channel device that is economical and can flexibly respond to changes in specifications by simplifying the circuit by using a microprogram.

(d) Configuration of the Invention The configuration of the present invention is to provide an ink face for the central processing unit and the input/output device in a channel device that controls data transfer between the main storage device and the input/output device according to instructions from the central processing unit. Microprogram A to control, Microprogram B to control the interface to the main memory, and Microprogram A to Microprogram B.
means for the microprogram A to request an operation from the microprogram B; means for the microprogram A to request an operation from the microprogram B; means for the hardware to request an operation from the microprogram B; a means for detecting the microprogram A;
operates while constantly monitoring the interface between the central processing unit and the channel device and/or between the channel device and the input/output device.

The microprogram B operates when there is an operation request from the microprogram A or hardware, and after the operation is completed, the microprogram B is configured to stop in a microstop state after notifying the operation requester of the operation completion.

(e) Embodiment of the Invention FIG. 1 is a block diagram of a channel device illustrating an embodiment of the present invention, and FIG. 2 is a time chart illustrating an example of the operation of FIG. 1. The microprogram A9 provided in the channel device 3 receives the I10 instruction from the central processing unit 2 via the central processing unit interface control circuit 6, decodes the I10 instruction, and if it is a star + 110 instruction, it uses CAW (channel address). - Sends a request to take in (word) to the microprogram B control circuit 8. The microprogram B control circuit 8 starts a CAW import routine if the microprogram B7 is in a stopped state. The microprogram B7 takes in the CAW from the main memory device 1 via the main memory device interface control circuit 5, and reads the CAW.
After performing a formant check, etc., the microprogram A9 is notified of the end of the operation via the microprogram B control circuit 8. The microprogram B7 then enters a stopped state after being notified of the end of the operation. Subsequently, microprogram A9 sends a request to capture a CCW (channel command word) to microprogram B control circuit 8, and microprogram B control circuit 8 starts the 00w capture routine of microprogram B7. The microprogram B7 is sent through the main memory ink face control circuit 5.

The CCW is fetched from the main memory device 1 and necessary data is sent to the data transfer control circuit 10. After notifying the microprogram A9 of the end of the operation.

It will be in a stopped state. Microprogram A9 is parallel to the CCW import operation of microprogram B7.

The input/output device 4 is activated via the input/output interface control circuit 1. When the microprogram A9 becomes ready to start data transfer with the input/output device 4, it instructs the data transfer control circuit 10 to start data transfer. The data transfer control circuit 10 controls data transfer between the channel device 3 and the input/output device 4, and controls the data transfer between the main storage device 1 and the channel device 3.
Microprogram B when transferring data between
A data transfer request is sent to the control circuit 8. The microprogram B control circuit 8 starts the data transfer routine of the microprogram B7. The microprogram B7 controls data transfer with the main memory device 1 via the main memory device interface control circuit 5. At this time, the microprogram B7 also updates the data address and height count. When the microprogram 137 completes the data transfer with the main storage device 1, it notifies the data transfer control circuit 10 of the completion of the operation and enters a stopped state. The microprogram Δ9 performs data transfer between the channel device 3 and the input/output device 4.
Termination of data transfer or central processing unit while? ? 2 to see if the next I10 instruction has arrived.

(f) Effects of the Invention 1 - As explained, the present invention improves processing speed by dividing I10 instruction processing and data transfer control into two microprograms, and by using microprograms. By simplifying the circuit, it is possible to provide a channel device control method that is economical and can flexibly respond to changes in specifications.

The effect is great.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a channel device illustrating an embodiment of the present invention, and FIG. 2 is a time chart illustrating an example of the operation of FIG. 1. 1 is a main storage device, 2 is a central processing unit, 3 is a channel device, 4 is an input/output device, 5 is a main storage device interface control circuit, 6 is a central processing unit interface control circuit, 7 is a microprogram 8. 8 is a microprogram B control circuit, 9 is a microprogram A, 10 is a data transfer control circuit, and 11 is an input/output interface control circuit. ), misery 2. ：Drinking

Claims (1)

[Claims] In a channel device that controls data transfer between a main storage device and an input/output device according to instructions from a central processing unit, a microprogram A that controls an interface to the central processing unit and the input/output device; . A microprogram B that controls an interface to the main storage device, a means for requesting an operation from the microprogram A to the microprogram B, a means for the microbumicogram A to detect the end of the operation of the microprogram B, and a means from the hardware. A means for requesting an operation from microprogram B and a means for the hardware to detect the completion of the operation of microprogram B are provided, and microprogram A is configured to automatically transmit an input signal between the central processing unit and the channel device and/or between the channel device. Microprogram B operates while monitoring the interface between the output devices, and microprogram B operates if there is an operation request from microprogram A or hardware. After the operation is completed, the operation requester is notified of the end of the operation, and then microprogram 1 is returned to the substate. A channel device control method characterized in that the channel device is stopped at .