System for repair of ROM programming errors or defects

Details System for repair of ROM programming errors or defects System for repair of ROM programming errors or defects

2006-09-05

2006-09-05

Elmore, Stephen C. (Department: 2185)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S144000, C711S145000, C711S156000, C711S163000, C711S170000, C714S006130, C714S006130, C714S035000, C714S042000, C713S001000, C713S002000

Reexamination Certificate

active

07103736

ABSTRACT:
A system is disclosed for use of imperfect ROMs in embedded systems. The ROM or other memory accessible upon start-up of the system, includes a stored program which checks an external source to determine whether any of the information in the ROM should be replaced. If it should be replaced, then the system retrieves good information from an external source and stores it into a cache memory. By setting a “lock” bit, erasure of the replacement information is prevented.

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