Fast compare circuit particularly for memory with redundant addr

Details Fast compare circuit particularly for memory with redundant addr Fast compare circuit particularly for memory with redundant addr

1991-06-12

1993-08-17

Sikes, William L.

Static information storage and retrieval

Addressing

Particular decoder or driver circuit

365200, 36518907, 371 216, G11C 700, G11C 800

Patent

active

052375374

ABSTRACT:
A circuit for comparing two registers has a pair of circuit elements for each bit position and one or the other of these elements conducts if a mismatch occurs between the corresponding register positions. These circuit elements are connected between a first node and a second node. A first circuit pulls up the first node and a second circuit pulls down the second node, and when none of the circuit elements conduct, the first and second nodes have approximately the voltage of the power supply and ground voltage respectively. When any element conducts, the node voltages are approximately equal, at a value established by the voltage dividing effect of the two circuits. An output circuit responds to the voltage between the two nodes to produce a binary voltage signifying a match or mismatch. The first and second circuits are formed by latches that improve the speed of charging and discharging the capacitance of the two nodes when a match or mismatch condition occurs. The circuit is particularly intended for comparing a memory address register with a register that permanently holds an address of a defective component. When a match is detected, a redundant component is selected instead of the defective component.

REFERENCES:
patent: 4757503 (1988-07-01), Hayes et al.
patent: 4922134 (1990-05-01), Hoffman et al.
patent: 5058070 (1991-10-01), Faber et al.
patent: 5073891 (1991-12-01), Patel
patent: 5142540 (1992-08-01), Glasser

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