Microprocessor with circuits, systems, and methods for operating

Details Microprocessor with circuits, systems, and methods for operating Microprocessor with circuits, systems, and methods for operating

1997-03-07

2000-04-11

Downs, Robert W.

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

395385, 711102, 711118, G06F 930

Patent

active

06049672&

ABSTRACT:
A microprocessor operates in response to microinstructions stored in a read only memory. A patch table stores a indication of patch microinstructions stored in cache memory. This cache memory caches data and/or macroinstructions for the microprocessor. Each new microaddress is compared with the patch table entries. If there in no match, then a multiplexer selects the microinstruction recalled from that microinstruction address within the microinstruction read only memory. If there is a match, then a corresponding patch microinstruction is recalled from the cache memory. The multiplexer selects this patch microinstruction. The microprocessor operates under the control of the selected microinstruction. This technique enables a fix of faulty microinstructions in the field, by supplying the computer user with the patch microinstructions. Using a portion of the cache memory to store the patch microinstructions eliminates any problem with specifying too large or too small a memory for patch microinstructions.

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