JPS61182677A - Head movement control system - Google Patents

Abstract

PURPOSE:To move the heads of plural devices simultaneously, to reduce the movement time and to improve device efficiency by outputting an output signal at the timing of a step close to the rise thereof by the select signal and the step of head movement to each device. CONSTITUTION:The movement quantity and the movement sequence of the heads of the devices #0-3 are stored in movement set counters (1-0)-(1-3). When the device 0 is selected by device selection control parts 1-4, a select signal DSL0 is inputted into a timing generating circuit 2-1 of the device 0. A direction recognition circuit 2-2 is actuated at the timing of a step signal that is close set just after the rise, the head of the device 0 is moved in a predetermined direction until the counter is reset to an initial value. The other devices are also instantly set in the directions so that the heads of plural devices are moved simultaneously to reduce the movement time and improve the device efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a head movement control system, and particularly to a head movement system that attempts to move the heads of a plurality of disk devices simultaneously rather than in chronological order.

Floppy disk devices are widely used because they are small and inexpensive. Since providing a control section for each of the plurality of floppy disk devices is wasteful and increases costs, the plurality of floppy disk devices are controlled by a control device.

Therefore, there is a need for a head movement control system that can efficiently move the heads of a plurality of devices simultaneously.

[Conventional technology]

A control device that controls multiple floppy disk devices is
When moving the head, a floppy disk device is selected and a head movement instruction signal is sent to the selected device.

This head movement instruction signal consists of a head movement amount and a head movement direction.

Therefore, it is necessary to keep the direction and amount of movement constant while sending out the head instruction signal.

As a result, when trying to move the heads of a plurality of floppy disk devices at the same time, it is possible to move them in the same direction, but it is impossible to move them in opposite directions.

For this reason, in general, when moving the heads of a plurality of floppy disk devices, head movement instructions for each of the floppy disk devices are issued separately, and the head movement of other devices is made to wait until the movement is completed. As a result, the movement of the head is processed in chronological order, and the movement processing time is the sum of the processing time required for each device, resulting in the problem of long processing time and the inconvenience of slowing down the processing speed. arise.

[Problem that the invention seeks to solve]

The present invention aims to improve the efficiency of head movement processing by providing a head movement control method that can simultaneously move multiple heads and reduce head movement processing time, in view of the conventional situation as described above. .

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides each device having a head that reads/writes information with a head movement amount step and a device selection signal to determine the initial timing after the rising edge of the device selection signal. A head movement control method, which is equipped with a timing generation circuit that generates timing in each step, and a recognition circuit that recognizes the movement direction at this timing. Each device determines the direction of movement at the step closest to the rise of the device selection signal, and thereafter starts moving the head in the determined direction until the counter reaches its initial value. Direction determination for other devices is instantaneous,
Since the head is moved simultaneously, the head can be moved faster.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram of a main part of an embodiment of the present invention, and FIG. 2 is a time chart of the present invention. The control device 1 controls head movements of floppy disk devices (hereinafter referred to as devices) 110 to #3. The control device 1 includes a movement amount setting counter group 1-0 to 1-3 that stores the amount of movement of the head corresponding to each device, a device selection control section 1-4 that controls selection of each device, and a head to a predetermined position. and a movement instruction control section 1-5 for moving the object up to the point where the object is moved.

The explanation will be given with reference to FIG. In this example, for example, as shown in FIG. 2(d), the startup order of each device is device #
It is assumed that head movement of device 0, head movement of device 12, head movement of device #1, and head movement of device #3 are performed in this order. First, the movement amount setting counters 1-0 to 1-3 of devices #0 to #3 are cleared by the set signal A, and the movement amount is stored in each movement setting counter.

The direction of movement of the head is indicated as shown in Fig. 2). That is, the direction instruction signal DIRC is, for example, a high level direction to the right and a low level to the left direction (in the case of positive logic).

When the above processing is completed, the movement instruction control section 1-5 causes the device selection control section 1-4 to output a device selection signal. The device selection control section 1-4 outputs selection signals DSL-0 to DSL-3 to each device as shown in FIG. 2(a) based on the schedule. Selection signal DSL-0~D
Even if any signal of SL-3 is detected, the device selection control section 1-4
If the step signal 5TEP is output, the movement instruction control section 1-5 outputs the step signal 5TEP. At this time, the direction instruction signal layer RC in the input data has already been output to each device by the movement instruction control section 1-5.

Therefore, for example, when device #0 is selected by device selection control section 1-4, selection signal DSL-0 is input to timing generation circuit 2-1 of device #0 together with step signal 5TEP. The timing generation circuit operates the direction recognition circuit 2-2 at the timing of the first step signal Tl after the rise of the selection signal DSL-0, and detects the level of the direction instruction signal DIRC at this timing. In the case of this device #0, the level is positive logic. Direction signal D
The direction of movement of the head of the apparatus is determined by the positive and negative levels of IRC.

Therefore, the head of device #0 will be moved in the direction of the logical pressure (right) until the counter 1-0 reaches the initial value. That is, the horizontal movement of device #0 is performed by the step signal T.
It starts with I. During the above operation, when the device selection signal DSL-2 of the device 112 rises, the direction is determined by the step signal T2 as described above and the device #2
start moving the head. As a result, each device #0 to #3S head movement is performed using step signals T1, T2 . T3. At T4, the direction of movement is determined and the head is moved.

Of course, it goes without saying that the movement of each head stops when each counter reaches its initial value.

〔Effect of the invention〕

As can be understood from the above description, in short, the present invention allows the heads of a plurality of devices to be moved simultaneously, reducing the moving time, and is effective in improving the efficiency of the devices that move the heads.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a main part of an embodiment of the present invention, and FIG. 2 is a time chart of the present invention. In the figure, 1-0 to 1-3 are movement amount setting counters, 1
-4 is a device selection control unit, 1-5 is a movement instruction control unit, 2-
1 is a timing generation circuit, 2-2 is a direction recognition circuit, #0
-13 indicate the devices, respectively.

Claims (1)

[Claims] In a system in which a plurality of devices are connected, each of which is equipped with a head that is connected to a control device that sends a device selection signal and the amount and direction of movement of a head that reads/writes information, each device has a head movement control device. A timing generation circuit is provided for outputting an output signal at a step timing close to the rising edge of the device selection signal based on the amount step and the device selection signal, and a recognition circuit for recognizing the moving direction at the timing, A head movement control method characterized by moving the head of a device.