Content-addressable memory

Details Content-addressable memory Content-addressable memory

1988-05-12

1990-01-16

Popek, Joseph A.

Static information storage and retrieval

Associative memories

Ferroelectric cell

365154, G11C 1500

Patent

active

048947997

ABSTRACT:
A content-addressable memory which has a storage bit cell (121, 122), signal supplying circuits (380, 390, 400) and comparison circuits (125, 126, 127, 128). The storage bit cell (121, 122) holds a first data (D) and a second data (D) of opposite phases. The signal supplying circuits (380, 390, 400) supply a first signal (a1) and a second signal (a1), respectively, to a first data line (180) and a second data line (190) of the storage bit cell (121, 122) in response to an input signal (A1) and a control signal (510). The first and second signals (a1, a1) are in opposite phases. The comparison circuits (125, 126, 127, 128) detect the relation between the first (D) stored in the storage bit cell (121, 122) and the first signal (a1) on the first data line (180) supplied from the signal supplying circuits (380, 390, 400) and the relation between the second data (D) stored in the storage bit cell (121, 122) and the second signal (a1) on the second data line (190) supplied from the signal supplying circuits (380, 390, 400). Wherein as part of the signal supplying circuit (380, 390, 400) circuit (400) dissolves the opposite phase relation between the first signal (a1) on the first data line (180) and the second signal (a1) on the second data line (190) in response to a control signal (510) and the input signal (A1). However, this circuit (400) does not dissolve the opposite phase relation when the input signal (A1) is "1" level and the control signal (510) is "1" level.

REFERENCES:
patent: 4523301 (1985-06-01), Kadota et al.
patent: 4646271 (1987-02-01), Uchiyama et al.

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