JPS5960529A - Input and output control device - Google Patents

Abstract

PURPOSE:To execute efficiently input/output control by executing to convert a disk control device to a module, so that it can correspond easily by only changing its part even if a host or subordinate device is changed. CONSTITUTION:A disk control device 40 consists of host and subordinate adaptors 41, 43, and a control part 42. Also, the adaptor 41 is connected to a CPU1 and a host device of a main storage device 2 through a bus 3. Also, the adaptor 43 is connected to a disk device 5. Also, the control part 42 is connected between the adaptor 41 and 43, and executes interface control between both adaptors. In this regard, an interface between the adaptor 41 and the control part 42, and an interface between the adaptor 43 and the control part 42 have the same consitution. In this way, even if the host or subordinate device is changed, it is unnecessary to change the whole device 40, and it can correspond easily by changing its part only.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a desk control device for an input/output device Ft of a computer.

[Background Art and Problems of the Invention] Conventional control devices for input/output devices have been made exclusively for the input/output devices. For example, magnetic disk storage @
A disk control device for controlling t has conventionally been constructed as shown in FIG. In the figure, 1 Vicpa, 2 is the main origin 1
．． α device, 3 is a path, 4 is a disk control device, and 5 is a disk device. .

The true purpose of the disk control device 4 is simply to convert the interface of the upper device such as 0PUI and the main storage device 2 into the interface of the lower device of the Dinuku device 5.

Conventional input/output control devices were made specifically for that system or configuration, so if the interface of a lower-level device changes or the interface of a lower-level device changes,
This required the entire input/output control device to be redesigned.

This resulted in the following drawbacks.

■ Every time the device changes, it is necessary to redo the installation.
That requires a lot of time.

■ Redesign is required every time the host device changes.

■ It requires a large number of circuits (Φ), which is not good for productivity and is inconvenient for maintenance.■ The architecture may change, which is bad for maintenance.

[Object of the invention] The present invention eliminates the above-mentioned conventional drawbacks,
To provide an input/output control device which can deepen the modularization of a disk control device and easily cope with changes in upper and lower devices by simply changing a part of the disk control device.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a block diagram showing a system configuration when the present invention is applied to a disk control device.

, In the figure, 40 is an input/output control device (ie, a disk control device) of the present invention. This disk controller 4
0 is the upper adapter 41, the control phloem 42, and the lower adapter 4
It is composed of three modules.

The host adapter 41 is connected to the OP U, 1 and the main storage device 2.
It is connected to the host device via bus 3. The lower adapter 43 is connected to the disk device 5. The control unit 42 is connected between the upper adapter 41 and the lower adapter 43, and performs an interface f171j (IA) between the two adapters 41 and 43. The interface between the lower adapter 43 and the control unit 42 has the same configuration.

Therefore, according to the present invention configured as described above,
If it is desired to connect a disk depaine 5 having an interface different from the conventional interface specifications to the disk control device 40, it is only necessary to change the lower adapter 43 according to the content. Similarly, the disk controller 40f:
When connecting to a host device that has an interface that differs from the previous interface specifications, the host adapter 41
Just change it depending on the content.

Next, details of each part of the present invention will be explained.

Figure 3 shows the control unit 42 and host adapter 41 shown in Figure 2.
FIG. 2 is a block diagram showing an interface between Note that the interface between the control unit 42 and the lower adapter 43 has the same configuration as that in FIG. 3, and can be similarly understood. In the figure, 401 is a command signal line. A control signal output from the control section 42 is transferred to the host adapter 41 by this command signal line 401 . The control signal is a signal indicating that the command OMD is being output to the data line 402. Therefore, the host adapter 41 that has received the control signal operates to read the command OMD output to the data line 402.

A bidirectional data line 402 transfers commands OMD from the control unit 42 to the host adapter 41 and data DATA between the control unit 42 and the host adapter 41. For example, when the control unit 42 transfers data to a register in the host adapter 41, a control 7 lip-flop (not shown), or when reading data,
Command CMD is output to the data line 402 and transferred to the upper adapter 41.

4o3H! F! This is an I-inclusive request. Through this line 403, an interrupt request signal R output from the host adapter 41 is transferred to the control section 42. That is, when the host adapter 41 requests the control unit 42 to perform (fil), when the host adapter 41 sends the source 1ηf-tt to the interrupt factor flip-flop (not shown) in the host adapter 41,
Control unit 42 via line 403 from host adapter 41
An interrupt request signal R is output to the interrupt request signal R. Interrupt factors that generate the interrupt request signal R include the following.

(1) When a request is made from the OPUI host device, for example, a disk read command, a write command, or a seek command.

(2) When an abnormality is detected in the adapter 41 and it is no longer possible to continue data transfer.

(3) Other times when it is desired to convey some information from the adapter 41 to the pricing department 42.

Next, 404 is a data request signal line. adapter 4
], 43 sends or requests write data from the disk device 5 to the control unit 42, or when sends or requests write data to the disk device 5, the adapters 41, 43 use this DRQ. , excites line 404. 405 is a response signal line. 'l+ for data request DRQ from host adapter 41
ill, , transfers the response signal of the i1 section 42. Until this response signal RQA is received, the adapter side does not request data D.
Unable to drop RQ.

Next, referring to FIG. 4, the host adapter 41-control unit 42
- The interface between the lower adapters 43 will be explained. Note that the above-mentioned device is composed of borrowed elements of a data transfer section, a control section, and an interrupt control section. First, when the data transfer unit 421 of the control unit 42 receives a data request DRQ from the upper or lower adapter 41 or 43 via the DRQ line, it outputs the data to be sent to the adapter on the DATA line according to the data transfer direction. Also, the data transfer unit 421 receives and receives data sent from the upper or lower adapters 41 and 43. Therefore, the data transfer unit 421 in the control unit 42 merely relays data transfer between the upper adapter 41 and the lower adapter 43.

When the upper adapter sends data from the lower adapters 41, 43 to the control unit 42, it puts the data to be sent on the DATA line and then excites the DRQ line. and control section 4
When the number 2 receives more data, the RQA line is fully excited, so when the response number 1 RQAf is received, the data on the DATA line may be increased by two times.

On the other hand, when the upper or lower adapter 41, 4:3 requests data from the control unit 42, the DRQ line is excited.

A data request DR is sent to the control example unit 42 via the LDRQ line.
When C1 is received, data is placed on the DATA line, and then the RQA line is excited.

7 P'7' The tags 141 and 43 read the data on the DATA line by receiving and receiving the RQA signal.

In the control R8 device 40 according to the present invention, the adapters are made with as little hardware as possible, and complicated hardware that is divided into two parts is not provided in the adapter 41 and 4:3 as much as possible, but is provided in the control unit 42. There are characteristics.

Therefore, the host adapter 4] is the host device (OPUI).

The main storage device 2) and the lower adapter 43 are connected to the lower device (disk device 5) and the control system. It is sufficient to have the Ih required for the interface with the JLI installation 40 in the form of a flip-flop or a register.

The setting of data in these flip-flop book registers and the interpretation of their contents can be left to the control section 42.

Sterilization device 40 is controlled by firmware and flip-flops within adapter 41-4:3.

Interpreting the contents in the register and this 1. The flip 70 performs a data write to the sender register.

As described above, when using the mountain-opening device according to the present invention, the upper adapter 41 and firmware can be designed to change the upper device, and the lower adapter 43 and firmware can be designed to change the lower device.

In this way, a highly versatile control device 40 can be obtained.

The above has described an example of application to the magnetic disk control value Ki, but if the present invention is not applied, it can also be applied to a magnetic tape control device, a line printer system + 11i device, etc. (111 person output control device). .

Thus, according to the present invention, in the A41 device on the side of the blade, (1) It is possible to create a control device that can be connected to various higher-level devices and lower-level devices based on the same architecture.

■ The number of man-hours required for installation can be reduced.

■ Easier maintenance.

■ Small variety of hardware allows for multi-purpose use.

The following effects were observed.

FIG. 3 is an explanatory diagram of interface signals required in this embodiment, and FIG. 4 is a block diagram showing a more detailed configuration of this embodiment.

1... CPU (Central Processing Unit @) 2...
...Main storage device jj number 3...Path 4, 40...Disk control device 5...Disk device 41...Upper adapter 42...Control+ii1 43...Device adapter (lower adapter) 4
11-421/431...Data transfer section 412
・422, 432... Control unit (control unit) 413, 423, 433... Interrupt control unit.

Claims (1)

[Claims] In an input/output control device that is located between a host device and an input/output device and converts commands from the host device into commands for the input/output device, there is a host adapter connected to the host device, and a lower adapter connected to the input/output device. an adapter, and a control unit connected between the upper adapter and the lower adapter,
The interface between the control unit and both adapters is composed of the same interface, and the interface includes at least a signal line for controlling data transfer, a signal line for controlling control data transfer, and a line between the adapter and the side shaft unit. An input/output control device comprising: a signal line for transferring data; and a signal line for suppressing an interrupt from the adapter to the control unit.