Digital timing unit

Details Digital timing unit Digital timing unit

1983-03-14

1985-05-14

Griffin, Robert L.

Pulse or digital communications

Spread spectrum

Direct sequence

377110, 3281291, H04L 708

Patent

active

045176817

ABSTRACT:
A digital timing unit for timing a data processing system or units thereof, wherein the output signals of a shift register are applied to a plurality of EXCLUSIVE OR gates (G.sub.1) . . . (G.sub.n). The shift register is activated from a known state so that an electric transition signal is shifted through the register cells. A timing cycle is thus defined which is utilized to set the register in a second known state. Feedback and control logic are provided for activating the register independently of its state and keeping it in the state occurring at the end of a timing cycle until a new start signal is received. Shifting of the register is caused by timing pulses generated by an oscillator (1). The timing signals generated by the timing unit and present on the output terminals of the EXCLUSIVE OR may be modified, as to the length, by changing the oscillator period and/or the connection between the EXCLUSIVE OR inputs and the outputs of the shift register.

REFERENCES:
patent: 3648237 (1972-03-01), Frey, Jr. et al.
patent: 4004100 (1977-01-01), Takimoto
patent: 4093997 (1978-06-01), Germer

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