Multi-port memory device with multiple sets of columns

Details Multi-port memory device with multiple sets of columns Multi-port memory device with multiple sets of columns

1996-12-06

1998-03-10

Nelms, David C.

Static information storage and retrieval

Addressing

Multiple port access

36523009, 365239, 36523006, 36518904, G11C 800

Patent

active

057269483

ABSTRACT:
A multi-port memory device includes a row-column array, a random access port, a plurality of bidirectional serial access memory (SAM) ports, and a switching network for coupling SAM ports to sets of columns. A column is defined as a number of memory cells sharing a sense amplifier. Sets of columns are defined in one rectangular region or among several rectangular regions of the array. The switching network selectively couples each SAM port with each set, each set with each other set, and each SAM port with each other SAM port. A video random access memory (VRAM) or a multi-port dynamic random access memory (DRAM) of the present invention provides increased flexibility in smaller die area.

REFERENCES:
patent: 4891794 (1990-01-01), Hush et al.
patent: 5265049 (1993-11-01), Watanabe
patent: 5319603 (1994-06-01), Watanabe et al.
patent: 5450355 (1995-09-01), Hush

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