Apparatus and method for controlling microinstruction sequencing

Details Apparatus and method for controlling microinstruction sequencing Apparatus and method for controlling microinstruction sequencing

1977-12-01

1979-05-15

Chapnick, Melvin B.

Boots, shoes, and leggings

G06F 916

Patent

active

041551206

ABSTRACT:
A microprogrammed digital computer employing a plurality of programmable read only memories containing stored control words which are specially chosen so as to provide for microinstruction sequencing in a manner which in the first instance assumes that no branching possibilities are present, even though one or more branching possibilities may in fact be present in the microinstruction flow path. The correctness of microinstruction sequencing is monitored concurrently with the execution of a microinstruction during each cycle for which a branching decision is required. When an incorrect assumed sequence is detected, correction is provided using microinstruction indexing and inhibiting signals which are selectively provided in response to the states of selected system conditions during the cycle.

REFERENCES:
patent: 3380025 (1968-04-01), Ragland
patent: 3956738 (1976-05-01), Tessera
patent: 3964027 (1976-06-01), Dalmasso
patent: 3990052 (1976-11-01), Gruner
patent: 4008462 (1977-02-01), Kanda
patent: 4040030 (1977-08-01), Cassonnet

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