JPH01315069A - Disk controller - Google Patents

Abstract

PURPOSE:To shorten the data transfer time by applying the subtraction or addition to the delay clock number data set for each seek address with a read/ write clock and producing a borrow or a carry to use this as a pseudo index. CONSTITUTION:When data are transferred over two tracks of a disk device 5, a subtraction counter 4a inputs the delay clock data set for each seek address from a table memory 3 based on the time difference between the pseudo indexes produced on a first and second tracks as long as an index pulse is sent from the device 5 during the operation of a read/write head 5a. Then the counter 4a subtracts the value shown by the delay clock number data with the read/ write clock received from the device 5. The counter 4a outputs a borrow when the count value exceeds '0'. A microprocessor 2 regards said borrow as a pseudo index and processes it as the reference position of a track. The same operation is carried out when the head 5a is sought on the second track.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk control device that controls a disk device that records and reproduces information.

[Conventional technology]

FIG. 3 is a block diagram for explaining the configuration of a conventional disk control device. The disk control device 1 includes a microprocessor 2 that performs calculations and controls, and controls data transfer with a disk device 5 that records and reproduces information.

Next, the operation will be explained. The microprocessor 2 in the disk control device 1 sends a seek address for positioning the read/write head 5a to a track that is a storage area of the disk device 5, and positions the read/write head 5a of the disk device 5 to the target track. Read/write data. Then, even after all the data on one track has been transferred, if there is still data to be transferred, that is, if there is data that needs to be transferred across two tracks, the microprocessor 2 After sending a new seek address by adding "1" to the sent seek address and positioning the read/write head 5a on a new track, when an index pulse generated on this track is detected, the following record is read. Continue data transfer as the first record.

[Problem to be solved by the invention]

Conventional disk control devices are configured as described above, so when data is transferred across two tracks of a disk device, data is transferred to the second track after the last record recorded on the first track is transferred. When performing track seek to position the read/write head,
When the second track seek is completed, the index position of the second track has already passed the set position of the read/write head, so the disk device must be operated until the index reaches the set position of the read/write head. Therefore, there was a problem in that it took a long time from starting the data transfer to reporting completion.

This invention was made to solve the above-mentioned problems, and it provides a disk that can shorten the time from starting data transfer to reporting completion even when data is transferred across multiple tracks. The purpose is to obtain a control device.

[Means to solve the problem]

In the disk control device according to the present invention, the pseudo index generated in the first track and the next track correspond to the seek address for positioning the read/write head 5a in the track that is the storage area of the disk device 5. There is a table memory 3 that holds delay clock number data set for each seek address based on the time difference with the generated pseudo index, and data from this table memory 3 is transferred by an index pulse from the disk device 5, and the data is The disk mounting M5
When a borrow or carry is generated by subtraction or addition at the read/write clock, the counter 4a or 4b provides this as a pseudo index to the microprocessor 2, and the microprocessor 2 uses the pseudo index to divide the data into multiple tracks. This system is characterized by data transfer with passing trucks.

[Effect]

The table memory 3 corresponds to a seek address for positioning the read/write head 5a on a track of the disk device 5, and is based on the time difference between the pseudo index generated in the first track and the pseudo index generated in the next track during seek. Holds delay clock number data set for each seek address. The counter 4a or 4b transfers data from the table memory 3 using the index pulse from the disk device 5, and subtracts or adds the data from the disk device 5 using the read/write clock to generate a borrow or carry. This is given to the microprocessor 2 as a pseudo index, and the microprocessor 2 transfers data to and from a plurality of tracks using the pseudo index.

[Embodiments of the invention]

FIG. 1 is a block diagram for explaining the configuration of a disk control device according to an embodiment of the present invention.

The disk control unit W1a corresponds to the microprocessor 2 that performs arithmetic and control, and a seek address that positions the read/write head 5a to a track that is a storage area of the disk device 5, and a pseudo index that occurs in the first track during a seek. A table memory 3 for storing the number of delay clocks that holds delay clock number data set for each seek address based on the time difference with the pseudo index occurring in the next track, and a disk device 5 that stores the data from this table memory 3. A subtraction counter 4 which generates a borrow by subtracting it with the read/write clock from the subtraction counter 4 and gives it to the microprocessor 2 as a pseudo index.
It is equipped with a.

Next, the operation will be explained. When transferring data across two tracks of the disk device 5, the disk controller 1
First, a sends a seek address to the disk device 5,
At the same time as positioning the read/write head 5a to the target track, the same seek address is sent to the table memory 3 for storing the number of delay clocks. When the index pulse is sent from the disk device 5 while the read/write head 5a is moving, the subtraction counter 4a inputs the delay clock number data from the table memory 3. In this case, the delay clock number data indicates that the time difference between the pseudo index generated on the first track and the pseudo index generated on the second track is smaller than the time required for the head 5a to seek and cross between the two tracks. This is data with a time set to a large value.

After the delay clock number data is input to the subtraction counter 4a, the subtraction counter 4a receives the read/write data from the disk device 5.
The write clock subtracts the value indicated by the number of delayed clocks, and when the counter value exceeds "0", a borrow is output. The microprocessor 2 regards this borrow as a pseudo index pulse and processes this pulse as the reference position of the track. After transferring all data on the first track, transfer the lead/record to the second track.
Similar operations are repeated when seeking the write head 5a.

With the above configuration, as soon as the read/write head 5a finishes seeking to the second track, the index pulse is output from the disk device 5, and the disk controller 1a controls the data transfer between the disk device 5 and the read/write head 5a. Transfer can proceed immediately.

FIG. 2 is a block diagram for explaining the configuration of a disk control device according to another embodiment of the invention. The disk control device 1b includes a microprocessor 2 that performs calculation and control.
, a table memory 3 for storing the number of delayed clocks that holds the aforementioned delayed clock number data, and data from this table memory 3 (specifically, the one's complement of the number of delayed clocks).
is added from the disk unit W5 using the read/write clock, and when a carry is generated, the addition counter 4b is provided to the microprocessor 2 as a pseudo index.

Next, the operation will be explained. When transferring data over two tracks of disk unit W5, disk controller 1
b first sends a seek address to the disk device 5, positions the read/write head 5a on the target track, and at the same time sends the same seek address and the number of delay clocks to the storage table memory 3. When an index pulse is sent from the disk device 5 while the read/write head 5a is moving, the addition counter 4b inputs the delay clock number data from the table memory 3. Thereafter, the addition counter 4b adds the complement of "1" to the number of delayed clocks using the read/write clock from the disk device 5, and outputs a carry when the counter value is carried. The microprocessor 2 regards this carry as a pseudo index pulse and processes this pulse as the reference position of the track. The same operation is repeated when seeking the read/write head 5a to the second track after all the data on the first track has been transferred.

〔Effect of the invention〕

As described above, according to the present invention, there is a table memory that holds delay clock number data set for each seek address, data from this table memory is transferred by an index pulse from a disk device, and the data is transferred to the disk device. When a borrow or carry is generated by subtracting or adding with the read/write clock, the counter is provided as a pseudo index to the microprocessor, so the index pulse transmitted from the disk device to the microprocessor is used as a seek Each address is delayed by a certain number of read/write clocks, and this has the effect of shortening the time from data transfer start to completion report even when data is transferred across multiple tracks. is obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram for explaining the configuration of a disk control device according to one embodiment of the present invention, and FIG. 2 is a block diagram for explaining the configuration of a disk control device according to another embodiment of the present invention. , FIG. 3 is a block diagram for explaining the configuration of a conventional disk control device. la, lb... Disk control device, 2... Microprocessor, 3... Table memory, 4a... Subtraction counter, 4b... Addition counter, 5... Disk device, 5a... Read / Light Head.

Claims (1)

[Claims] In a disk control device that is equipped with a microprocessor that performs calculations and controls and controls data transfer with a disk device that records and plays information, it corresponds to the seek address that positions the read/write head on the track that is the storage area of the disk device. and a table memory that holds delay clock count data set for each seek address based on the time difference between the pseudo index that occurs in the first track and the pseudo index that occurs in the next track during seek, and from this table memory. data is transferred by the index pulse from the disk device,
When a borrow or carry occurs by subtracting or adding the data using the read/write clock from the disk device, a counter is provided which supplies this as a pseudo index to the microprocessor, and the microprocessor tracks multiple tracks using the pseudo index. A disk control device characterized in that it transfers data to and from tracks spanning a wide range of tracks.