Semiconductor memory device having serial data input circuit and

Details Semiconductor memory device having serial data input circuit and Semiconductor memory device having serial data input circuit and

1985-10-15

1988-03-22

Hecker, Stuart N.

Static information storage and retrieval

Read/write circuit

Serial read/write

365 78, 365240, 340800, G11C 700

Patent

active

047333766

ABSTRACT:
A semiconductor memory device including a memory cell array 1, a serial data input circuit for high-speed, large data store in memory cells and a serial data output circuit for high-speed, large data read-out from the memory cells. The serial data input circuit includes a plurality of shift registers 15, for consecutively storing serial input data S.sub.IN applied from an external circuit, and a plurality of first gates 14, for operatively and simultaneously connnecting the shift registers and a plurality of bit lines BL of the memory cell array to store simultaneously the serial input data stored in the shift registers into desired memory cells selected by a desired word line. The serial data output circuit includes a plurality of second gates 12 operatively connected to the bit lines, a plurality of data holding circuits 7, an input of each being operatively connectable to the corresponding bit line through the corresponding one of the second gates, a plurality of third gates provided between outputs of the data holding circuits and data bus(es) 26 and for outputting data held in the data holding circuits to the data bus(es), and a data output circuit 9, 10 having a gate driving circuit for selectively driving one of the third gates. The second gates are simultaneously operated to transfer a plurality of data on a selected word line into the data holding circuit set, and the data held in the holding circuits are output to the data bus(es) in response to the operation of the third gates. The semiconductor memory device is operable for high-speed, large data first-in and first-out.

REFERENCES:
patent: 4060801 (1977-11-01), Stein et al.
patent: 4149195 (1979-04-01), Hartke
patent: 4412313 (1983-10-01), Ackland et al.
patent: 4591075 (1985-09-01), Dill et al.
patent: 4616343 (1986-10-01), Ogawa

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