Multi-ported content addressable memory with precharge "non matc

Details Multi-ported content addressable memory with precharge "non matc Multi-ported content addressable memory with precharge "non matc

1996-07-15

1998-05-19

Nelms, David C.

Static information storage and retrieval

Associative memories

Ferroelectric cell

365203, G11C 700

Patent

active

057544638

ABSTRACT:
A content addressable memory (CAM) is disclosed which includes a memory cell, a comparator, a hit signal line, and a miss signal line. In one embodiment, an incoming signal is compared to the contents of the memory cell. If the incoming signal matches the memory cell contents, a hit signal is asserted on the hit signal line. The miss signal line is precharged. The hit signal controls the discharge of the miss signal line, such that the miss signal line is discharged only if the hit signal is asserted. The CAM can be expanded to generate additional miss signals by providing for the comparison of additional incoming signals to the memory cell, or to make the discharge of the miss signal line dependent on the hit signals generated by comparisons between additional incoming signals and the contents of additional memory cells. Miss signals from more than one memory cell can be combined to yield a match signal, which can be used as an input to fast domino circuitry. An exemplary implementation is shown in which the CAM of the present invention is used as the ready circuit in a reservation station of a microprocessor.

REFERENCES:
patent: 5396448 (1995-03-01), Takayanagi et al.
patent: 5426602 (1995-06-01), Lukoff
patent: 5428565 (1995-06-01), Shaw
patent: 5490102 (1996-02-01), Jubran
patent: 5530824 (1996-06-01), Peng et al.

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