JPS60245030A - Disk controller - Google Patents

Abstract

PURPOSE:To reduce the frequency of interruption of a control processor accompanying read/write control to half and to improve the performance of the device by providing a timer circuit when plural disk devices are controlled by one control processor. CONSTITUTION:The control processor 3 starts the seeking operation of a disk device 6 through a seek starting circuit 4 and a disk interface circuit 5 with a data read or write instruction sent from a host processor 2 to the disk device 6. Then, the processor 3 calculates a rotation wait time from the calculation result of the rotation position when the device 6 finishes the seeking operation, and sets the sum of the seek end time of the device 6 in the timer circuit 12. The circuit 12 outputs a signal to the processor 3 through an interruption control circuit 9 the set time later so as to initiate an interruption, and the processor 3 starts the device 6. Consequently, the frequency of interruption to the control processor accompanying read/write control is reduced to half and the device performance is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a disk control device that controls a disk device used as a peripheral device for an electronic computer.

[Prior art]

Conventionally, this type of disk control device has had a configuration as shown in FIG. In FIG. 7, (1) is a disk control device, (co) is a host processor that gives read or write commands to the disk control device (1), and (3) is a disk controller that receives instructions from the host processor (co). A control processor that issues commands to various circuits in the device (1), a seek startup circuit that gives seek startup to the disk device (6) through the disk interface circuit (7),
6) The disk interface circuit (j
), the seek end detection circuit (CI) detects when the sector information given from the control processor (3) matches the sector information obtained from the disk device (6) through the disk interface circuit (5). The generated target sector coincidence detection circuit (C9) outputs the respective signals generated from the seek end detection circuit (ri) and the target sector coincidence detection circuit (C9) as interrupt input signals to the control processor (,?). an interrupt control circuit, and (10
) is a read/write control circuit for writing or reading data to or from the disk device (6).

Next, the operation of the conventional device shown in FIG. 1 will be explained. First, the host processor (2) issues a command to read or write data to, for example, the 4M disk device (6) to the control processor (3). In response to this, the control processor (3) sends the 4
A seek start is performed on the M disk device (6). Thereafter, the control processor (3) becomes ready to accept processing for disk devices (6) other than the /j6M disk device. This A6M disk device (6) issues an end signal when the seek process is completed. This signal is
Inter 7: Detected by the seek completion detection circuit (ri) through the I-4 bus circuit (j), and the interrupt control circuit (
9) to the control processor (3) (end interrupt)
It takes. As a result, the control processor (3) provides the target sector to the target sector coincidence detection circuit <g>, and
When the rotational position of the disk device (6) reaches the relevant sector, activation is performed so that an interrupt (coincidence interrupt) occurs. Until this coincidence interrupt occurs, the control processor (3) is in a state where it can accept processing for disk devices (6) other than the 4M disk device.

This coincidence interrupt is applied from the target sector coincidence detection circuit (ff) to the control processor (3) through the interrupt control circuit (Ten), and as a result, the control processor (3)
A write or read start is applied to the 4M disk device (6) through the read/write control circuit (lO).

Since conventional disk control devices have the above-mentioned configuration and operation, the control processor is required to process one interrupt of different types for one read/write control. This increases the complexity of the system and the time required for interrupt processing. Therefore, for the control processor, the processing acceptance time for a disk device other than the one currently being processed is shortened, resulting in a decrease in the performance of the disk control device.
There were drawbacks.

[Summary of the invention]

This invention was made to eliminate the drawbacks of the conventional ones as described above, and its purpose is to reduce the number of interrupts to the control processor due to read/write control by providing a timer assist path. The object of the present invention is to provide a disk control device whose performance has been reduced by half and whose performance has been improved.

[Embodiments of the invention]

FIG. 2 is a block diagram showing a disk control device according to an embodiment of the present invention, in which the same parts as those of the conventional device shown in FIG. 1 are designated by the same reference numerals.
A detailed explanation thereof will be omitted.

In FIG. 1, (//) is a sector counter circuit, which indicates the rotational position of the disk device currently being processed by a sector value, and (lλ) is a timer circuit, which is a control processor ( A signal is output when the time specified in 3) has elapsed.

Next, the operation of the embodiment shown in FIG. 2 will be explained. First, the host processor (co) gives a command to the control processor (3) to read or write data to the /16M disk device (6). In response to this, the control processor (3) sends the
A seek start is performed on the M disk device (6). Thereafter, the control processor (3) controls the sector counter circuit (
1/), reads the current rotational position of the 4M disk device (6), calculates the rotational position when this /16M disk device (6) completes the seek operation, and calculates the rotational waiting time from this rotational position. and the 4M disk device t
The sum of the seek completion time in (4) and the timer circuit (7)
, 2). Then, when the set time has elapsed, this timer circuit (/) activates the interrupt control circuit (9).
through which the control processor (3) is interrupted. At this point, the 4M disk device (6
) is in a readable or writable state, the control processor (3) activates the /i6M disk device (A) K for writing or reading through the read/write control circuit (io). In addition, after setting a predetermined time to the timer circuit (/), the control processor (3) does not accept processing for a disk device other than the one currently being processed until an interrupt occurs. become possible.

〔Effect of the invention〕

As explained above, according to the disk control device of the present invention, when controlling multiple disk devices with one control processor, the number of interrupts associated with read or write control can be halved. Since the configuration includes a timer circuit, the processing by the control processor is simplified, and the processing time due to interrupts is shortened, so that the performance of the disk control device as a whole is improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a conventional disk control device, and FIG. 2 is a block diagram showing an embodiment of the present invention. In the figure, /...disk control device, 3...control processor, ri...interrupt control circuit, l/...sector counter circuit, /co...timer circuit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A disk control device that processes various controls for a plurality of disk devices includes at least a control processor, a sector counter circuit, and a timer circuit, and the sector counter circuit reads the current rotational position of a designated disk device and transmits the information to the control processor. the control processor calculates the required time based on the information regarding the rotational position and sets this time in the timer circuit, and the timer circuit interrupts the control processor when the set time elapses. A disk controller that is designed to operate.