JPH02190922A - Input/output controller - Google Patents

Abstract

PURPOSE:To reduce the capacity of a microprogram and to shorten data transfer time by comparing the specific information of a sector to be an object for previously held data transfer with that of a sector read out from a disk device by a comparator. CONSTITUTION:In the case of transferring data between a master equipment and an optical disk equipment, an input mode for inputting the ID of a sector inputted from the optical disk device in an ID register 6 is set up in a mode register 4 to allow the optical disk device to start data transfer. On the other hand, an expected ID is previously set up in a comparing ID register 5. When the ID read out from the optical disk equipment is inputted to the ID register 6, the contents of the register 5 are compared with that of the register 6 by the comparator 7. When both the contents coincide with each other, an internal bus control part 1 is started and data transfer is executed between the optical disk equipment and the master equipment. Consequently, the capacity of the microprogram can be reduced and the data transfer time can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an input/output control device, and more particularly to an input/output control device having an optical disk control circuit that controls an optical disk device and a processor that controls data transfer between a host device and the like. Regarding a control device.

Prior Art Conventionally, in this type of input/output control device, when data is transferred to a sector where alternative sector processing has been performed, the ID set for the sector by a microprogram is used.
If the IDs do not match, the process ends abnormally, and if the IDs match, data transfer is performed.

Such conventional input/output control devices perform two processes: one to check the match between the IDs set in the sector by the microprogram, and the other to transfer data when the IDs match. As a result, the capacity of the microprogram increases and data transfer takes time.

The present invention was made in order to eliminate the problems of the conventional ones as described above, and provides input/output control that can reduce the capacity of microprograms and shorten data transfer time. The purpose is to provide equipment.

An input/output control device according to the present invention is an input/output control device for controlling data transfer between a disk device and a host device in which specific information specifying each of a plurality of sectors is set in each of the plurality of sectors. Comparing the device with a holding means that holds in advance specific information of the sector to be the target of data transfer, the sector specific information read from the disk device, and the specific information held in the holding device. and comparing means, and when a match is detected by the comparing means, an instruction is given to execute the data transfer.

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In FIG. 6, there is an internal bus 100 in the input/output control device according to the embodiment of the present invention, and Communication with a host device (not shown) is executed under the control of the bus control unit 1.

Further, a processor (μp) 2, an optical disk control unit 3, a mode register 4, and a comparison ID register 5 are connected to the internal bus 100, respectively.

Comparator circuit 7 compares the contents of ID register 5 and ID
The contents of register 6 are compared, and the ID is determined based on the comparison result.
This is a circuit whose output signal becomes valid when a match is detected and a data transfer instruction signal from the optical disk controller 3 is input.

Next, the operation of one embodiment of the present invention will be explained using FIG.

When transferring data between a host device and an optical disk device (not shown), an input mode is set in the mode register 4 to input the sector ID from the optical disk device into the ID register 6, and the data is transferred to the optical disk device. Activate.

In addition, the expected ID (ID of the sector to be data transferred) is set in the comparison ID register 5 in advance, so that when the ID read from the optical disk device is input to the ID register 6, the comparison ID is set in advance. The contents of the 111D register 5 and the contents of the ID register 6 are compared by the comparator circuit 7, and if the IDs match,
The output signal of the comparator circuit 7 activates the internal bus control section 1, and data transfer is performed between the optical disk device and the host device.

As mentioned above, by setting the expected ID in the comparison ID register 5 and setting the input mode in the mode register 4, the data transfer of the alternative sector can be executed without checking the ID match by the microprogram. Ru.

In this way, by comparing the expected ID set in the comparison ID register 5 in advance with the ID from the optical disk device input to the ID register 6 by the comparator circuit 7, it is possible to determine whether the data is to be transferred. Since it is not necessary for the microprogram to check the match between the ID of the new sector and the ID of the alternative sector read from the optical disk device, the number of steps of the microprogram can be reduced.

Therefore, the capacity of the micro program can be reduced accordingly, and the configuration of the micro 10 gram can be simplified.

Furthermore, by reducing the number of microprogram steps, data transfer time can be shortened.

In one embodiment of the present invention, data transfer with an optical disk device has been described, but it is obvious that the present invention can also be applied to data transfer with other disk devices, and is not limited thereto.

1. As explained above, according to the present invention, the comparison circuit compares the specific information of the sector that is the target of data transfer held in advance and the specific information of the sector read from the disk device. By doing so, the capacity of the microprogram can be reduced and the data transfer time can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. Explanation of symbols of main parts ■...Internal bus control unit 3...Optical disk control unit 4...Mode register 5...Comparison ID register 6... ...ID register 7...Comparator circuit

Claims (1)

[Claims] (1) An input/output control device that controls data transfer between a disk device and a host device, in which specific information that specifies each of a plurality of sectors is set in each of the plurality of sectors, and the target of the data transfer. and a comparison means for comparing the specific information of the sector read from the disk device with the specific information held in the holding means, and the comparing means An input/output control device characterized in that when a match is detected, an instruction is given to execute the data transfer.