Digital circuit to count like signals in a data word

Details Digital circuit to count like signals in a data word Digital circuit to count like signals in a data word

1998-10-30

2000-03-21

Wambach, Margaret R.

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

Applications

372 12, 372 13, 3401462, G06M 300

Patent

active

060410922

ABSTRACT:
A digital circuit for counting the number of zeroes or ones in a data word comprising a plurality of series paths leading to one-hot encoded outputs. Each one-hot encoded output indicates a different number of like signals in the input data word. One of the plurality of series paths is activated by connecting the series path from an input power rail to the one-hot output. A series path is connected through a plurality of transfer gates, each controlled by either a single bit of the input data word or its complement. The series paths may be optimized to share transfer gates by interconnecting them in a tree or lattice structure. Subsections of the input data word may be counted separately in independent tree or lattice structures, then combined in subsequent combinational stages of the circuit. The resulting one-hot encoded count of like signals may then be binary encoded by a final stage of the counting circuit.

REFERENCES:
patent: 4043671 (1977-08-01), Goodwin
patent: 5572682 (1996-11-01), Garibays, Jr. et al.

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