Method and apparatus for indicating when the total in a counter

Details Method and apparatus for indicating when the total in a counter Method and apparatus for indicating when the total in a counter

1989-07-28

1991-10-22

Heyman, John S.

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

Systems

Comparing counts

377 54, 377 56, 377 76, 377 81, H03K 2110

Patent

active

050602446

ABSTRACT:
In order to compare the total reached by a counter counting pulses from a source with a given number, the more significant digits from the counter are compared with the corresponding digits of the given number. The comparator produces an output when the groups of more significant digits are equal. An adjusted output taking account of the less significant digits of the given number is obtained by delaying the output by a time period equal to that required for the number of pulses from the source to be incremented by the number represented by the less significant digits of the given number. The time delay is provided by a multi-stage shift register using the pulses from the source as shift pulses, the output from the comparator being applied to the first stage and the adjusted output being derived from a stage selected according to the less significant digits of the given number.

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Whitton, N., N. England, and C. DeMonico, Manage Design Tradeoffs in High-End Graphics Board, Electronic Design, Mar. 17, 1988, pp. 77-84.

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