SU1569890A1 - Shaper of pulses of flight path in positioning system of magnetic disc storage - Google Patents

Abstract

The invention relates to the field of instrumentation, computing, and can be used in magnetic disk drives having automatic systems for moving magnetic heads. In order to simplify and extend the functionality, the pulse shaper of the distance traveled further contains a decoder and an EXCLUSIVE OR scheme, the links between these blocks and the known blocks provide enhanced resistance to external interference and defects in the position sensor. The proposed solution allows us to simplify the reference device of the path traveled in the magnetic disk drive positioning system.

Description

The invention relates to instrument engineering, computer technology, and is intended for use in magnetic disk drives having automatic systems for feeding magnetic heads to specified addresses.

The purpose of the invention is to simplify the former when used with a two-phase position sensor.

Figure 1 shows the functional diagram of the proposed shaper; figure 2 - the timing diagram of the work.

The shaper contains the comparators block 1, the decoder 2, the R-S trigger module 3, the EXCLUSIVE circuit OR 4, the one-shot 5, and the inputs of the comparators block 1 are connected to the buses of the two-phase input signal and with different polarity sources of the reference voltage. The outputs of the comparator unit 1 are connected to the first inputs S and R of the block of the trigger 3 and to

the corresponding inputs of the decoder 2. With In addition, the input of the decoder 2 is connected to the input control buses. The second inputs S and R of the block of the flip-flops 3 are connected to the corresponding outputs of the decoder 2, and the outputs of the block of the flip-flops 3 through the circuit EXCLUSIVE OR 4 are connected to the input of the one-shot 5.

The shaper works as follows.

The comparators block 1 generates a series of pulses corresponding to: a) a smaller value of the signal of the first phase from the position sensor with respect to the negative threshold; b) a smaller value of the signal of the first phase from the position sensor relative to the positive threshold; c) a smaller value of the signal of the second phase from the position sensor relative to the negative threshold; d) a smaller value of the signal of the second phase of the position sensor relative to the positive threshold.

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The triggers included in the block of triggers 3 change their state after successive arrivals of their S and R series of pulses a, b, c, and g. The sequence of pulses formed by the block of triggers 3 is processed by the EXCLUSIVE OR 4 circuit and goes to the input of the one-shot 5, which on the front and rear edges generates the counting pulses of the traversed path. Prior to the formation of a start pulse signal arriving at one of the inputs of the decoder 2, and a signal. Direction arriving at the other input, the triggers of the block of trigger 3 are set depending on the combination of other input signals of the decoder 2 to the corresponding state.

Formula of the invention Shaper count pulse former

the path traveled in the magnetic disk drive positioning system, which contains a comparators unit, whose inputs are connected to input signal buses and different polarity sources of reference voltage, an RS flip-flop unit and a one-shot, differing in that, for the sake of simplicity, the decoder and the EXCLUSIVE OR circuit, the first inputs S and R of the trigger block are connected to the outputs of the comparators block, the second inputs R and S of the trigger block are connected to the outputs of the decoder, the inputs of which are connected to the corresponding input buses m and controlling the output of the comparator unit, and outputs trigger unit via the exclusive OR circuit connected to the input of monostable multivibrator.

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Claims (1)

Formula of the invention A pulse generator for counting the distance traveled in a positioning system of a magnetic disk drive, comprising a comparator unit, the inputs of which are connected to the input signal buses and different-voltage sources of reference voltage, an RS-flip-flop unit and a single-shot, characterized in that, for the sake of simplification, into it a decoder and an EXCLUSIVE OR circuit are introduced, with the first inputs S and R of the trigger block connected to the outputs of the comparator block, the second inputs R and S of the trigger block connected to the outputs of the decoder, inputs which are connected to the corresponding input control buses and outputs of the comparator unit, and the outputs of the trigger unit through an EXCLUSIVE OR circuit are connected to the input of a single-shot device. FIG. 1