Program counter range comparator with equality, greater...

Details Program counter range comparator with equality, greater... Program counter range comparator with equality, greater...

2006-10-03

2006-10-03

Baderman, Scott (Department: 2114)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C714S050000, C340S146200

Reexamination Certificate

active

07117398

ABSTRACT:
An program counter address comparator includes two comparators comparing an input program counter address with respective reference addresses. The comparators produce a match indication on selectable criteria, such as greater than, less than, equal to, not equal to, less than or equal to, and greater than or equal to, and can be selectively chained. Input multiplexers permit selection of either the program counter address bus or a secondary address bus. The reference addresses and control functions are enabled via central processing unit accessible memory mapped registers.

REFERENCES:
patent: 5809544 (1998-09-01), Dorsey et al.
patent: 5822579 (1998-10-01), Wichman
patent: 6640198 (2003-10-01), Miyazaki et al.

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