JPS586514A - Disc controller - Google Patents

Abstract

PURPOSE:To improve the efficiency of storage to a disc device, by discriminating a data processing command signal through the provision of a data compression circuit for a data write circuit and a dara expansion circuit for a data readout circuit, and controlling the transit of the signals to the compression or the expanding circuit. CONSTITUTION:In writing a data possible for data compression such as picture data to a disc device, a control signal 6 consisting of a data compression command signal and a data 4 are transmitted, an AND gate 12 is opened with the signal 6 and a write data 7 compressed at a compression circuit 5 are transmitted to the disc device. In reading out the compressed data, a signal 6 consisting of a data expansion command signal together with a readout signal are transmitted, an AND gate 15 is opened and a readout data 10 expanded with an expansion circuit 9 is transmitted. When the data is not compressed or expanded, the signal 6 opens AND gates 11 or 14 and the data not expanded are transmitted. Thus, since the data can be expanded, the efficiency of storage to the disc device can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to refreshing a disk control device that writes data to a disk device and reads written data.

Conventionally, when writing data to a disk device, the disk control device did not modify the written data and wrote it to the disk device in the same form as it was transferred to the disk control device. Further, when data is read from the disk device, the read data is not modified in the disk control device and is transferred to the disk control device in the format 11 that has been read.

Figure 1 is a block diagram showing this conventional device. In the figure, (1) is a data path, (2) is a disk controller, (3) is a disk device, and the data path (1) is a disk controller.
The data transferred through the disk controller (
2), it is written to the disk device (3) without any modification. Data read from the disk device (3) is transferred through the data bus (1) without being modified within the disk controller (2).

Since the conventional disk control device is configured as described above, there is no difference between the amount of data to be written and the amount of data to be written.

Therefore, when writing a large amount of compressible data such as image data to a KSF device, using the conventional device has disadvantages such as poor storage efficiency.

The present invention has been made to eliminate the drawbacks of the conventional ones as described above, and an object of the present invention is to provide a disk control device capable of compressing or decompressing data and writing data to a disk device with high storage efficiency. It is an object.

An embodiment of the present invention shown in FIG. 2 will be described below. In the figure, (4) is a disk device (not shown)
Write data to, (5) data compression circuit, (6)
is a control signal, (7) is data written to the disk device, (8) is data read from the disk device, (9)
is a data decompression circuit, and αη is a control circuit that operates according to the above control signal and controls whether or not to pass the write data through the data compression circuit (5); 9, AND game) (11
), as, and an inversion circuit 0.

or a control circuit that operates in response to the above control signal and controls whether or not to pass the read data expansion/compression circuit (9);
This is data transferred from the disk control circuit (2) having AS.

Next, the operation will be explained. When writing compressible data such as data to a disk device, a control signal consisting of a data compression command signal (4) is sent together with data (4).
6) will be sent to you. This control signal opens the fi AND gate a and sends the write data (7) compressed by the compression circuit (5) to the disk device.

Further, when data compressed in this manner is read from a disk device, a control signal consisting of a data expansion command signal is sent together with a read signal. With this control signal, j
7 AND gate α field is opened and expanded by the expansion circuit (9), and 9 read data members are sent out.

When data is not compressed or expanded, a control signal (6) consisting of the command signal opens the AND game (lυ or (14)) and data that is not expanded or compressed is sent out.

As described above, according to the present invention, since data can be expanded or contracted, there are effects such as improved storage efficiency in a disk device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional device, and FIG. 2 is a block diagram showing an embodiment of the present invention. In the figure, (2) is a disk control circuit, (5) is an expansion/contraction circuit, (9) is an expansion circuit, and a? ), α・ is a control circuit. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] In a device that writes data to a disk device and reads the stored data, a data compression circuit is provided in the data write circuit that writes the data, and a data compression circuit is provided in the data read circuit that reads the data. 1. A disk control device comprising an expansion circuit and a control circuit for determining a data processing command signal and controlling whether or not data is passed through the compression or expansion circuit.