JPS6128150A - disk access device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention 1d relates to a disk access device that reads data at high speed, which is stored in a disk device used as an auxiliary storage device of a computer.

Conventional configurations and their problems In recent years, disk buffer memory, which temporarily stores data in a disk device, has been used as an auxiliary storage device for cocipiputers as a technology to access data in a disk device at high speed. Alternatively, disk access devices equipped with a disk cache memory have come into use.

A conventional disk access device will be described below with reference to the drawings.

FIG. 1 shows an overview of a conventional disk access device. In FIG. 1, numeral 1 is a disk device which is an external auxiliary storage device, and 2 is a disk buffer memory for temporarily storing data in the disk device 1. As shown in FIG. 3 is the main memory of the host computer 4.

The operation of the disk access device configured as described above will be described below.

When the host computer 4 reads data in the disk device 1, the data in the disk device 1 is first transferred to the disk buffer memory 2, then transferred to the main storage section 3 of the host computer 4, and then read by the host computer 4. Configured to process data. After processing, when you want to read the same data from the disk device 1 again, you just need to transfer the previously stored data from the disk buffer memory 2 to the main memory 3, so the access speed is said to be high. .

However, in the above configuration, when reading data that is not stored on the disk buffer memory 2,
Data read from the disk device 1 is transferred to the disk buffer memory 2, and from the disk buffer memory 2 to the main storage unit 3, which reduces the number of data transfers compared to the case where the disk buffer memory 2 is not used. This is more than when reading directly from disk device 1, so
Access speed becomes slower. Furthermore, when reading data stored on the disk buffer memory 2, the access speed cannot be made faster than the data transfer time from the disk buffer memory 2 to the main storage section 3.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned drawbacks of the prior art and provides a disk access device that is equipped with a disk buffer memory and can improve the access speed of the disk access device.

Structure of the Invention In order to achieve the above object, the present invention provides a command register m (!l
: , Execution result k A post status register section, a register control circuit that controls the command register section and the status register section, an internal control circuit that controls data input/output operations to and from the disk device, and temporarily stores data. A disk buffer memory, a window control circuit that allows the host computer to access the disk buffer memory, and a window address conversion register, and allows the host computer to directly access the disk buffer memory via the window control circuit. It is something.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows a block diagram of a disk access device in one embodiment of the present invention.

In FIG. 2, 5 is a command register section that receives operation commands from the host computer 4 via the host internal bus 6, 7 is a status register section that shows execution results, and 8 is a control section for controlling the command register section 5 and status register section 7. This is a register control circuit. Reference numeral 9 denotes an internal control unit which receives operation commands from the host computer 4 via the register control circuit 8 and controls data input/output operations with respect to the disk device 1 . 1o is a disk controller unit that controls the disk device 1 by an internal control circuit 9, and data is transferred to the disk buffer memory 2 via the controller internal bus 11.

12 is a window control circuit that allows the host computer 4 to access the disk buffer memory 2; 13 is a window address conversion register; 14 to 17 are bidirectional transceivers; 18 to 19 are buffers; and 20 is a host internal memory bus.

The operation of the disk access device configured as above will be described below.

An operation command from the host computer 4 is set in the command register unit 5 by the register control circuit 8 through the host internal bus 6, and the command operation instructed by the internal control circuit 9 is executed. When writing data on the main memory 3 of the host computer 4 to the disk device 1, the data is transferred to the disk buffer memory 2 by the internal control circuit 9 via the memory bus 20 inside the host, and from the disk buffer memory 2 to the disk controller. Data is written to the disk device 1 by the internal control circuit 9 via the section 10 . On the other hand, when data in the disk device 1 is read into the main memory 3 of the host computer 4, the data in the disk device 1 is transferred to the disk buffer memory 2 by the internal control circuit 9 via the disk controller section 1o. Since then, in the prior art, data on the disk buffer memory 2 has been transferred to the main memory 3 of the host computer 4 by the internal control circuit 9 via the host internal memory bus 20. However, in this embodiment, the host computer 4
The disk buffer memory 2 is configured to be accessible via the host computer 4 as if the main memory 3 of the host computer 4 were accessed.

The operation will be explained below.

First, the host 1-computer 4 sets a window in a specific area within its own address space. The settings are
- Notify the window control circuit 12 of the start address of the window area and the size of the area via the internal bus. A window address translation register 13 is provided to determine which area of the actual disk buffer memory 2 the window area corresponds to, and the host computer 4 can set any address to this window address translation register 13. . The window open command and window close command are provided as instructions for creating this window function, and the host computer 4
The window function operates by sending the signal to the window control circuit 12. After sending the window open command,
When the host computer 4 reads data in the disk device 1, the data is stored in the disk buffer memory 2.
If it is stored on the disk buffer memory 2
The above address is learned from the status register unit 7 and set in the window address conversion register 13. By accessing the window area, the host computer 4 can directly access the data it wants to read, eliminating the need to transfer data from the disk buffer memory 2 to the main memory 3 of the host computer 4. Even if the data to be read does not exist on the disk buffer memory 2, the data is transferred from the disk device 1 to the disk buffer 1 memory 2, and then the above operation is performed.
Disk buffer memory 2 to host 1-computer 4
There is no need to transfer it to the main memory 3 of

As described above, according to this embodiment, when the host computer 4 reads data in the disk device 1 that is managed and stored on the disk buffer memory 2, the data is not transferred to the main memory 3 of the host computer 4. By directly accessing the window area, the desired data can be accessed as if it were data on the main memory of the host computer 4, thereby omitting the data transfer time in the disk access time and shortening the total access time. can do.

Effects of the Invention As described above, the present invention is configured so that a host computer can directly access data on a disk buffer memory provided in a disk access device through a window, and the disk is connected to a sofa memory. When accessing the above data, the access time is just the time required to set the data from the status register to the address space and the window address conversion register, so very fast disk access can be achieved, and the effect is great. There is something.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a conventional disk access device, and FIG. 2 is a block diagram of a disk access device according to an embodiment of the present invention. 1...Disk unit, 2...Disk buffer memory, 3...Main memory, 4...Host computer, 5...Command register section ,6. ,,,,Hoss l-internal bus, 7...su...
Status register section, 8...Register control circuit, 9...Internal control circuit, 10...Disk controller 1-roller section, 11...Controller internal bus, 12...Mountain window control circuit, 13...
... Wind address conversion register, 14, 15°1
6.17... Bidirectional transceiver, 18.19
...Buffer, 20...Host internal memory bus.

Claims (1)

[Claims] a command register section that receives operation commands from the host computer; a status register section that indicates execution results;
a register control circuit that controls the command section and the status register section; an internal control circuit that receives operation commands from the host computer via the register control circuit and controls data input/output operations with respect to the disk device; A disk buffer memory for temporarily storing data stored in a disk device by a control circuit, a window control circuit that allows a host computer to access the disk buffer memory, and a window address conversion register. disk access device.