Counter with glitchless terminal count indication

Details Counter with glitchless terminal count indication Counter with glitchless terminal count indication

1988-01-28

1989-06-13

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Identifying or correcting improper counter operation

377 56, 377 33, H03K 2140

Patent

active

048399108

ABSTRACT:
A glitchless terminal count indication digital counter having a clock signal as an input thereto is disclosed and comprises a state logic means comprised of a plurality of DQ flip-flops for providing a digital count with the clock signal being sent to an input thereof, a next state decode means, a next terminal count decode means for providing an indication at its output that the digital output count will reach a terminal count at the next clock cycle, and a terminal count logic means for obtaining the indication from the next terminal count decode means and providing therefrom at the next clock cycle a glitchless terminal count indication. The next state decode means has inputs and outputs, with the digital count being an input thereto, and the state logic means and the next terminal count decode means being coupled to the output thereof. The terminal count logic means is preferably comprised of at least one D-type flip-flop having both a clock signal and the next terminal count decode means as inputs thereto, and logic circuitry for forcing the output terminal to indicate the reaching of a terminal count. When the next terminal count decode means senses the penultimate count, it changes the value of its signal which is supplied to the flip-flop of the terminal count logic means. Thus, upon the next rising clock signal, the terminal count flip-flop will change its output and, via the logic circuitry, will force the output terminal of the counter to assume a terminal count value.

REFERENCES:
patent: 4135150 (1979-01-01), Quigley
patent: 4363123 (1982-12-01), Grover
patent: 4628521 (1986-12-01), Nishimura
patent: 4661930 (1987-04-01), Tran
patent: 4745630 (1988-05-01), Underwood
Signetics Corp., TTL Data Manual, 1986, Chap. 6, pp. 142-145, 467-471.
EDN, Sep. 20, 1974, "Decode Ripple Counter Outputs the Glitchless Way", by T. M. Farr.

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