JPS59139425A - Data transfer control system - Google Patents

Abstract

PURPOSE:To enhance the transfer speed of data between a central processing unit and a peripheral device if required, by providing a by-pass line which by- passes an auxiliary controller between the central processing unit and one of plural peripheral devices. CONSTITUTION:The by-pass line which by-passes the auxiliary controller is provided between the central processing unit and one of plural peripheral devices. For example, a backup file controller BUFC3 is provided as the auxiliary controller between a central processing unit CPU1 and peripheral devices consisting of a magnetic tape device 5 and a magnetic device 7. Data transmission and reception between peripheral devices are controlled by the BUFC3 under the control of the CPU1, and a by-pass line 8 which by-passes the BUFC3 is provided between the CPU1 and the magnetic disc device 7 of the peripheral device. In accordance with contents of transmitted and received data, data and signals are transmitted and received between the CPU1 and the magnetic disc device 7 without passing the BUFC3.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a computer system including an auxiliary control device that controls the exchange of data between a plurality of peripheral devices under the control of a central processing unit (CPU).

(B) Background of the Technology For example, in a computer system equipped with a magnetic disk drive as an external storage device, in order to facilitate the storage or movement of data storage media, it is generally equipped with a magnetic tape, and the magnetic disk drive and magnetic tape drive are combined. Data is frequently exchanged or transferred between the two.

Therefore, in such a computer system, in order to reduce the load on the CPU (D), an auxiliary control device, such as a backup file controller (BUFO), is provided between the OPU and the plurality of external storage devices. The B F'UO is configured to control data transfer between the magnetic disk device and the magnetic tape device.

(q Conventional technology and problems Even in the computer system equipped with the above-mentioned BUFo,
This is true because data is transferred between the CPU and peripheral devices, but conventionally, there has been no bypass circuit for the BUFO. Further, the BUFO data transfer buffer normally uses an 0M-08 LSI1, and therefore it takes a long time to send data byte by byte, resulting in an overrun problem.

0 Purpose of the Invention The purpose of the invention is to create a connection between the CPU and peripheral devices in Section 8TI B.
Auxiliary control device Ti like UF'O? In the provided computer system, the data transfer speed between the OPU and peripheral devices can be increased at public expense.

(H+') Structure of the Invention The data transfer control method according to the present invention controls data transfer between a central processing unit, a plurality of peripheral devices, and the plurality of peripheral devices under the control of the central processing unit. In a combiator system comprising an auxiliary control device,
A bypass path that completely bypasses the auxiliary control device is provided between the central processing unit and at least one of the plurality of peripheral devices, and depending on the content of data to be exchanged, the central processing unit can bypass the auxiliary control device t. Transfer of data and signals between the device and any of the plurality of peripheral devices? This is what I tried to do.

① Embodiments of the Invention The gist of the present invention will be specifically explained below with reference to fully illustrative embodiments.

Diagram M1 shows a system configuration diagram of an embodiment of the present invention,
l is the central processing unit (OF (J), 2 is 0PUI and Hi
Driver receiver installed between own BUFO, 8 is 0PUI control? In response, an auxiliary control unit (BU) is used to control and receive data, that is, transfer, between multiple peripheral devices, that is, magnetic disk devices, and the #i key device.
FO), 4 is a driver receiver provided between BUPOB and the magnetic tape device described later, 5 is a magnetic tape device, 6
is a driver receiver provided between BUFOB and the magnetic disk device described later, 8 is a bypass path provided between 0PUl and the magnetic disk device 7 to bypass BUFO8=2, and 81 is a bypass path provided in bypass path 8), 81 is a control circuit provided in BUFO 8, 82 is a buffer provided in BUFO 8 for the magnetic tape device 5, 88 is a gate provided between the buffer 82 and the buffer described below, and 84 is a control circuit provided in BUF'08 for the magnetic disk device 7. It is a buffer.

FIG. 2 shows the complete time chart for data transfer between 0PUI and magnetic disk drive yt7, the sending of
b) Send parameters, (C) transfer data, (d)
) is for receiving command completion report, (e) is for busy signal,
(f) is a pan meter request, (attention to trout,
(h) is an interrupt request for data transfer, and (i) is an interrupt request for command completion report.

When the attention signal (b) is turned on, the gate 8B is closed and the gate 81 is surrounded, and when the attention signal (g) is turned off, the gate 8B is opened and the gate 81 is closed. attention signal (
Monitoring of g) and control of gate 88 and g) 81 are performed by a micro 10 setter (not shown) built into BUFO 8. In this way, data transfer (c) and (b) i bypass path 8 This is done through

2. According to this embodiment, the command (a) and pan meter (b) issued for 7Fs from OP U l vAll
't buffer 82. Does your co-worker have a magnetic disk drive? The end of the command sent from ? @i notification (
) can be stored in the buffer 84. According to the invention, even if the data transfer buffer of the auxiliary control device is slow and rare, the CPU and peripheral Since data can be transferred directly to and from the device without going through all the auxiliary control devices, the transfer speed can be increased.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram of an embodiment of the present invention, and FIG. 2 is a time chart for data transfer. In FIG. 1, Ul; C0PtT, 81qBUFO. 5 is a magnetic chip 1 device, 7 is a magnetic disk device, and 8 is a bypass path.

Claims (1)

[Claims] A central processing unit, a plurality of peripheral devices, and an assistant that controls data transfer between the plurality of peripheral devices under the control of the central processing unit? [i4 control equipment and money ex-
In the data system, a bypass path for completely bypassing the auxiliary control device is provided between the central processing unit and at least one of the plurality of peripheral devices, and depending on the content of the data to be exchanged, the bypass path is provided to completely bypass the auxiliary control device. A data transfer control method characterized by the fact that data is exchanged between a central processing unit and any of its peripheral devices.