JPS6371981A - Floppy disk control system - Google Patents

Abstract

PURPOSE:To improve the capacity of a host processor by providing an interruption mask flag for masking an end interruption from an LSI for controlling a floppy disk and a head stable time count part indicating that a specified time elapses after the detection of a O track from a floppy disk device. CONSTITUTION:The head stable time counting counter 13 measures the specified time by a clock signal from the time of the detection of the O track and outputs a head stable time elapse signal 24 after the specified time elapses. An interruption masking register 10 is reset by the head stable time elapse signal 24 and an interruption signal 21 from the floppy disk controlling LSI is transmitted through an AND gate 11 as an interruption signal 22 to the host processor 1. Since the host processor can decide the recalibrate operation completion of the floppy disk according to this interruption signal 22, it can execute the next seek operation without performing a processing for having the head stable time of the floppy disk device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention relates to a computer system, and particularly to a 70mm video, f system control system suitable for improving the processing capacity of a host device.

[Conventional technology]

As a method of reducing the burden on the upper processing unit in a floppy disk system, Japanese Patent Application Laid-open No. 56-92665,
There is a method as shown in the same publication No. 92662, but it does not mention the waiting time after the floppy disk drive's empty plate operation.d [Problem to be solved by the invention] In the conventional LSI for controlling floppy disks, , at the time of receiving the 0-track detection signal from the floppy disk device, it is assumed that the 0-track detection signal is received from the floppy disk device. It takes 10 minutes from when the detection signal is sent until the head actually stabilizes.
In many cases, it takes about ~50 milliseconds, and while the head is stabilizing, STl! When an iP pulse is issued, there is a possibility that tracking deviation will occur. In order to prevent this misalignment, the conventional approach was to wait for a time specified by the program of the host device and then issue a BTEP pulse for reading to the floppy disk. That's why it's ranked high! ! As a program at the location, there are a method of looping the program a certain number of times and waiting for a specified time, or a method of waiting for a specified period of time using an interrupt such as a timer of a host device. However, in the method of looping the program, the program of the host device cannot perform other services during this time, resulting in a decrease in processing capacity. The method of using interrupts such as a timer of a host device has the disadvantage that the program's interrupt processing becomes complicated and that the next seek command cannot be issued unless the host device processes the interrupt twice.

SUMMARY OF THE INVENTION An object of the present invention is to provide a floppy disk control method that solves the above-mentioned problems and improves the processing capacity of a host processing device.

[Means for solving problems]

The above objective is achieved by providing an interrupt mask flag that masks the end interrupt from the floppy disk control LSI and a head stabilization time count unit that indicates that a specified time has elapsed after detecting the 0 track from the floppy disk device. be done.

[Effect]

The head stability time counting section counts a specified time after receiving the 0 track detection signal from the floppy disk device. The interrupt mask flag is set by the 0 trunk detection signal of the recalibrate command, and is reset by a signal from the head stabilization time counter indicating that a specified time has elapsed. When the interrupt mask flag is set, an interrupt signal from the floppy disk control LSI is sent to the host device. As a result, the host device is an LSI for floppy disk control.
The next arc command can be issued without being aware of the head stabilization time of the floppy disk device. A processing device 1, which will be explained with reference to the drawings, is connected to a 70-tube disk control LSI 2 via a bus 25, and the floppy disk control LSI 2 is further connected to a floppy disk device 3 via a control line.

When using the Kukiyari plate command, the floppy disk device 6
In response to the 0 track detection signal 20 from the 0 track detection signal 20, the interrupt mask flag flip 70 and 10 cassettes are set, and at the same time, the initial 1 shift is set in the head stabilization time counter 16. On the other hand, LSI for floppy disk control
2 is the 0 track production signal.

After receiving 20, it sends out 6 interrupt signal 21. However, since the interrupt mask flag flip-flop 10 is set, no interrupt signal 22 is sent to the higher-level processing device through the AND gate 11. Further, the head stabilization time counter 13 measures the time specified by the clock signal from the time when the 0 track is detected, and outputs the head stabilization time elapsed signal 24 after the specified time has elapsed. The interrupt mask register 10 is reset by the head stabilization time elapsed signal 24. thereby AND
L for floppy disk control via gate 11
An interrupt signal 21 from S is sent as an interrupt signal 22 to the higher-level processing device 1. The higher-level processing device can determine that the floppy disk recalibration operation has ended by using this interrupt signal 22, so it can start the next seek without having to wait for the head stabilization time of the floppy disk device. There are some effects that can be done.

〔Effect of the invention〕

According to the present invention, when the head stabilization time of the floppy disk device has elapsed and the next seek command can be accepted, the host device is interrupted, so that the program of the floppy disk device is When the head is stable, you don't need to be conscious of 1. This simplifies the 1-interrupt processing and improves the processing power of the host device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention. 1... Upper processing unit, 2... LS king for floppy disk control, 3...
...Floppy disk device, 10...Frig Flots, 11.14...AND gate, 12...N
AND gate, 16... Counter, 20... 0 Tojitsuku production/number, 2]... 70 disk control If, interrupt signal of S engineering color, 22... To upper level/quick burial Nagataka Interruption 1g No. 2.3...
Interrupt, input signal 24...Head stabilization time elapsed signal, 25...Bus 26...Control line. Representative Patent Attorney Grade 11 Katsu Rikitsutsu 1

Claims (1)

[Claims] 1. Regarding a system in which a program in a host processing unit controls a floppy disk device via a floppy disk control LSI, when a recalibration command is issued, the floppy disk is considered to have finished recalibrating when it receives a 0 track detection signal from the floppy disk device. In a floppy disk control system equipped with a disk control LSI and a floppy disk device that requires a specified time from sending out a 0 track detection signal until the head actually stabilizes and the next seek is possible, By providing a flag that masks the interrupt signal from the floppy disk control LSI for a certain period of time at the time of a calibration command, an interrupt is made to the upper processing device after the head stabilization time at the end of recalibration, and the upper processing device In addition to simplifying the control of the floppy disk control LSI,
A floppy disk control method characterized by improving the processing capacity of upper-level processing units.