Microcode control mechanism utilizing programmable microcode rep

Details Microcode control mechanism utilizing programmable microcode rep Microcode control mechanism utilizing programmable microcode rep

1982-02-22

1985-12-03

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 922

Patent

active

045569380

ABSTRACT:
A microcode control mechanism is provided for producing the sequences of microwords used to control the execution of processor instructions in a microprogrammed data processor. This microcode control mechanism includes sequence counter circuitry for supplying a sequence of numbers and a programmable logic array mechanism responsive to the processor instruction and to the sequence of numbers for producing a sequence of microwords needed to execute the instruction. The microcode control mechanism also includes repeat circuitry responsive to a predetermined microword produced by the programmable logic array mechanism for setting the sequence counter circuitry back to a count which is less than the current count for causing a selected portion of the microword sequence to be repeated. The microcode control mechanism further includes a programmable repeat counter for counting the number of times the selected portion is repeated and for disabling the repeating action after a selected number of repeats.

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Manning et al., IBM Technical Disclosure Bulletin, Nov. 1979, pp. 2440-2441.
Adams et al., Electronics, Aug. 17, 1978, pp. 96-102.
Cook et al., IEEE Journal of Solid-State Circuits, Oct. 1979, pp. 833-840.

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