Ram/ROM hybrid memory architecture

Details Ram/ROM hybrid memory architecture Ram/ROM hybrid memory architecture

1994-12-28

1996-12-03

Popek, Joseph A.

Static information storage and retrieval

Read/write circuit

Including level shift or pull-up circuit

3652257, 365 96, G11C 1140

Patent

active

055815057

ABSTRACT:
An integrated circuit memory which includes at least some RAM/ROM hybrid columns. The RAM/ROM hybrid cells operate as normal SRAM cells forever, unless and until they are programmed to operate as ROM cells. Thus users who need the extra security permitted by ROM encoding can have this capability, while users who do not need ROM encoding can use off-the-shelf parts as RAM only.

REFERENCES:
patent: 4584669 (1986-04-01), Moynihan et al.
patent: 4616343 (1986-10-01), Ogawa
patent: 4995004 (1991-02-01), Lee

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