Computer apparatus having electrically rewritable nonvolatile me

Details Computer apparatus having electrically rewritable nonvolatile me Computer apparatus having electrically rewritable nonvolatile me

1997-06-20

1999-08-03

Hua, Ly V.

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

711164, 711155, 39518301, 39518318, G06F 1128, G06F 906

Patent

active

059335955

ABSTRACT:
When the contents of a flash ROM which is an electrically rewritable nonvolatile memory are rewritten, after an IPL program for rewriting stored in the flash ROM is transferred to a RAM, mapping of memory space is switched by a switching control circuit. The IPL program transferred to the RAM is protected. The contents of the flash ROM are erased by use of the IPL program, and an updated program supplied through an RS-232C interface is written into the flash ROM. When a bug is caused due to static electricity in the IPL program stored in the flash ROM, an EPROM which is a nonvolatile memory element is attached, an IPL program stored in the EPROM is executed, and the IPL program stored in the EPROM is directly transferred to the flash ROM.

REFERENCES:
patent: 4864542 (1989-09-01), Oshima et al.
patent: 5386541 (1995-01-01), Moridaira
patent: 5469564 (1995-11-01), Junya
patent: 5596738 (1997-01-01), Pope
patent: 5603056 (1997-02-01), Totani

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