Large scale circuit device containing simultaneously accessible

Details Large scale circuit device containing simultaneously accessible Large scale circuit device containing simultaneously accessible

1984-12-13

1987-05-19

Moffitt, James W.

Static information storage and retrieval

Systems using particular element

Flip-flop

365190, G11C 1134

Patent

active

046673105

ABSTRACT:
A master slice type LSI is constructed as a three port memory circuit in which respective cells exclusively utilized as memory circuits constituting respective memory regions can be accessed simultaneously. More particularly each cell exclusively used as a memory circuit is constituted by a flip-flop circuit including two inverters (31, 32) which are connected in parallel opposition, a single write data input line (39) and two read out data output lines (40, 41) which are connected to the flip-flop circuit through transfer gate circuits (33,34,35), respectively, and at least three word lines (36, 37, 38) along which independent word signals are transmitted. The three transfer gate circuits (33, 34, 35) are independently enabled and disenabled based on the word signals transmitted over the word lines (36, 37, 38).

REFERENCES:
patent: 4447894 (1984-05-01), Imamura
patent: 4578780 (1986-03-01), Baba

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