System memory and a microcomputer comprising the same

Details System memory and a microcomputer comprising the same System memory and a microcomputer comprising the same

1993-04-29

1995-07-11

Popek, Joseph A.

Static information storage and retrieval

Read/write circuit

365104, G11C 700, G11C 1700

Patent

active

054327423

ABSTRACT:
A system memory which includes a plurality of memory cells capable of functioning as ROMS or RAMs and being arranged in an arbitrary minimum unit. The read only area includes the memory cells functioning as the ROMS, and the write and read area includes the memory cells functioning as the RAMs. The read only areas and the write and read areas can be mixed and arranged in a memory space of the system memory without discontinuity nor a overlap. In a microcomputer including the system memory, a program is stored in the read only area, and data is stored in the write and read area.

REFERENCES:
patent: 4575819 (1986-03-01), Amin
patent: 4855803 (1989-08-01), Azumai et al.
patent: 4995004 (1991-02-01), Lee
Shubat et al., "Mappable memory subsystem for high speed applications" 1989 Symposium on VLSI Circuits Digest of Technical Papers, May 25-27, 1989, pp. 47-48.
U.S. patent application Ser. No. 08/003,991 (Jan. 15, 1993).

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