SU1413671A1 - Device for checking servosignal of magnetic disk stack - Google Patents

Abstract

The invention allows to generate servo signals of a disk storage unit module with a hot frequency range and high accuracy. The counter 10, synchronized with the reference frequency of the oscillator 1, cycles through the contents of the cells in the memory block of the ROM 16. The location of the memory block in the ROM 16 is specified by the unit 2 of the reference job. With the help of the trigger I1 of the delay, pulses of the ROM through the elements I 12-15 appearing on the given segments of the time axis include the generators 3, 4 of the flowing out and the generators 5, 6 of the flowing currents. The total signal passes through the filter 7 and the attenuator 8. As a result, a servo signal standard is formed at the device output, which can be used to calibrate the servo surface control system in the disk module, i p. . 1 il. $ (L

Description

The invention relates to the field of information storage, and in particular to devices for controlling the servo signal of a package of magnetic disks.

The aim of the invention is to improve the accuracy of control of the servo signal package of magnetic disks.

The drawing shows the proposed device, option.

A device for monitoring the servo signal of a package of magnetic disks contains a reference clock generator 1, a reference unit 2 and transforming elements' made in the form of the first and second current generators 3 and 4 of one direction, and the first and second current generators 5 and 6 of a different direction and connected by the outputs to the input of the low-pass filter 7, the output of which through the attenuator 8 is connected to the output bus 9.

The device also contains a five-digit counter 10 and a four-bit trigger 11, connected by synchronizing inputs to the inverse output of the clock generator 1, the first, second, third and fourth elements And G2-15 connected by the first inputs to the direct output of the clock generator, and a read-only memory element 16 . The outputs of the counter 10 are connected to the lower address inputs of the read-only memory element 16, which is connected by the senior address inputs to the outputs of the reference task unit 2 and connected by the outputs to the information inputs of the trigger 11. The trigger And is connected by the first, second, third and fourth outputs to the second inputs of the first, the second, third and fourth elements And 1215, the outputs of which are connected to the inputs of the first generator 3 of the current of one direction, the first 5 current of the other direction, the second generator 4 of the current one Government & second current generator 6 different direction.

A device for controlling the servo signal package of magnetic disks operates as follows.

The clock generator 1 acts on the first, second, third. and the fourth elements And 12-15 and to the counter 10, which iterates over the addresses of the memory cells of the element: 1 b of read-only memory. At the same time, at each output of the element 16 of constant memory, logical unit levels appear in those clock cycles in which they are provided for by the embedded program. The levels of the logical unit from the outputs of the element 16 of the permanent memory are supplied to the trigger 11, eliminating the voltage bounce that occurs when selecting the next memory cells with each clock cycle. The logical unit levels from trigger 11 are gated in the first, second, third and fourth elements AND 12-15 clock pulses from the generator 1 clock pulses. Moreover, at the outputs of the first, second, third and fourth elements And 12-15, pulses of a given duration appear at time instants determined by the program of the element 16 of the permanent memory. The program of the permanent memory element 16 is composed in such a way that at the output of the first element And 12 pulses appear at those times when a positive half-wave of the pulse should be generated in the standard of the servo signal, and at the output of the second element And 13 * at those times when negative half-wave to be formed. According to the program of the element 16 of read-only memory, at the output of the third element And 14, the pulses appear at those times when the positive half-wave of the pulse should be twice as large in amplitude in the standard of the servo signal, and at the output of the fourth element And J5 - at those times the amplitude of the negative half-wave of the pulse should become twice as large. Since the state of the counter 10 is periodically repeated after 32 cycles, the duration of the repeating servo signal standard is 32 cycles. In this case, the type of the clock standard is selected using the switches in the block specifying the standard, acting on the element 16 of the permanent memory.

The pulses of the first, second, third and fourth elements And 12-15 are respectively supplied to the first generator 3 of the current in one direction, to the first generator 5 of the current of another direction, to the second generator 4 of the current of one direction and to the second generator 6 of the current of another direction, acting on the input low pass filter 7. In this case, at the input of the low-pass filter 7, a g sequence of rectangular pulses of alternating polarity of single or double amplitude is formed. The filtering result from the output of the low-pass filter 7 passes to the output bus 9 through the attenuator 8, which attenuates to the level characteristic of the reproducing magnetic head. From the output bus 9, a predetermined reference image of a servo signal with a calibrated clock frequency and calibrated amplitude is received.

Claims (1)

The claims ¹ A device for monitoring the servo signal of a package of magnetic disks containing a clock pulse generator, a reference setting unit and converting elements connected by outputs to an input of a low-pass filter, the output of which is connected via an attenuator to the output bus, characterized in that, in order to increase the control accuracy, it a counter and a trigger are introduced, connected by synchronizing inputs to the inverse output of the clock, the elements And connected by the first inputs to the direct output of the clock, and e a constant memory element, and the converting elements are made in the form of the first and second current generators of one direction and the first and second current generators of another direction, and the counter outputs are connected to the lower address inputs of the constant memory element, which is connected by senior address inputs to the outputs of the reference unit and is connected by outputs to the information inputs of a trigger connected by 20 first, second, third and fourth outputs to second inputs of the first, second, third and fourth e, respectively ementov and whose outputs are connected to inputs sootvet25 governmental first generator current in one direction, the first generator current the other direction "of the second generator current in one direction and a second current generator 30 the other direction.