Circuitry and method for variable single transition counting

Details Circuitry and method for variable single transition counting Circuitry and method for variable single transition counting

1992-08-31

1993-06-15

Sikes, William L.

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

Systems

Comparing counts

377 34, 36518907, 36518904, G11C 700

Patent

active

052205860

ABSTRACT:
In a method and circuitry for variable single transition counting, a count signal (178) is provided on a count line. A direction control bit (264) is output on a direction control line. A significant bit (278e) is output on a significant bit line. A first single transition count (278a-d) is incremented in response to the count signal (178) and to the direction control bit (264) having an incrementing logic state. The first single transition count (278a-d) is decremented in response to the count signal (178) and to the direction control bit (264) having a decrementing logic state. The first single transition count (278a-d) and the significant bit (278e) together form a second single transition count (278a-e). The second single transition count (278a-e) is compared against a preselected value (296), and a comparison signal (320) is output in response to the second single transition count (278a-e) being equal to the preselected value (296 ). The direction control bit (264) and the significant bit (278e) are toggled in response to the comparison signal (320), such that a value of the second single transition count (278a-e) may be changed in response to the preselected value (296).

REFERENCES:
patent: 4757464 (1988-07-01), Zimmerman et al.
patent: 5084841 (1992-01-01), Williams et al.
patent: 5157701 (1992-10-01), Parker

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