Microprogram control

Details Microprogram control Microprogram control

1985-08-13

1988-08-09

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 922

Patent

active

047632461

ABSTRACT:
A microprogram controlled data processing apparatus is described, in which each machine-level instruction is divided into a number of phases, and each phase is executed by a sequence of microinstructions. The machine-level instruction is decoded to produce a set of microprogram parameters, and in each phase of the instruction a sub-set of these parameters is selected, and broadcast over a parameter bus to individual decoders which decode the microinstructions, so as to qualify the effects of the microinstructions. The use of parameters in this way allows the same microprogram sequence to be used for several different instruction variants, and hence reduces the total size of the microprogram.

REFERENCES:
patent: 3404378 (1968-10-01), Threadgold et al.
patent: 3979729 (1976-09-01), Eaton et al.
patent: 3990054 (1976-11-01), Perlowski
patent: 3991404 (1976-11-01), Brioschi et al.
patent: 4021779 (1977-05-01), Gardner
patent: 4131835 (1978-12-01), Lange
patent: 4491908 (1985-01-01), Woods et al.
patent: 4649470 (1987-03-01), Bernstein et al.

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