Communications: electrical – Digital comparator systems
Patent
1997-05-08
2000-09-05
Wambach, Margaret R.
Communications: electrical
Digital comparator systems
3401462, G06F 750
Patent
active
061149454
ABSTRACT:
A programmable fast comparison circuit for determining whether the result of a logic operation on two operands is the same as a specified number in advance of the completion of the actual operation includes four fast compare units coupled to each operand signal pairs of the same degree of significance for identifying possible result signal pairs of the same degree of significance. Each fast compare circuit generates a positive signal when a result signal pair is possible based on the corresponding operand bit signal pairs. Control signals determined by the specified number signal pair of the same degree of significance is used to activate one of the four fast compare circuits with the corresponding result signal pair. When the fast compare circuit activated by the control signals is a circuit generating a positive signal, the positive signal is transmitted to a combinatorial circuit. When a positive signal is transmitted by all the sets of fast compare circuits (and one result signal bit is specifically identified with a positive signal applied to the combinatorial circuit), the result number is identical with the specified number and an answer-correct signal is generated. By using the symmetry of the possible result bit signal pairs, the four fast compare circuits for each result signal pair can be reduced to two fast compare circuits. In another embodiment, N kill/generate/propagate circuits can perform a programmable fast comparison for logic operations involving two N length operands.
REFERENCES:
patent: 5270955 (1993-12-01), Bosshart et al.
patent: 5699279 (1997-12-01), Widigen et al.
patent: 5761521 (1998-06-01), Chilinski et al.
Brady Wade James
Donaldson Richard L.
Garner Jacqueline J.
Texas Instruments Incorporated
Wambach Margaret R.
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