High speed parallel microcode program controller with high effic

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395375, 364DIG1, 364247, G06F 932

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054288096

ABSTRACT:
A microprogram controller selects a sequence of low, gate level instructions (microcode) to execute a higher level (assembly language level) instruction. The controller includes a plurality of accessing elements for accessing a microinstruction from a corresponding plurality of different possible blocks of a microprogram store. All accessing elements are executed in parallel to provide a plurality of possible microinstructions. Control logic selects which one of the three accessed microinstructions is to be used next in sequence. The parallel nature of this process is fast. A unique instruction set minimizes the number of gates required for microcode storage. A subset of these instructions increase the efficiency of the microcode in terms of both the number of microinstructions required to perform a function and the microcode store address space-consumed by those microinstructions.

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patent: 4984151 (1991-01-01), Dufari

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