Patent
1992-06-05
1997-07-01
Lall, Parshotam S.
395427, G06F 922
Patent
active
056447612
ABSTRACT:
In order to efficiently undertake the micro-steps required to execute an extended instruction in a central processing unit, a main sequence controller and a separate basic operations controller having its own sequencer and the ability to run semi-autonomously are provided. Normally, the main sequence controller determines the operation of the basic operations controller, but, in the case of execution of, for example, a multi-word instruction requiring extended basic operations, the basic operations controller temporarily takes control over the main controller until the extended basic operations have been completed. The result is a relatively simple sequencer that supports tight micro-coded functions where many of the sequence decisions can be predetermined.
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Demers Richard L.
Guenthner Russell W.
Lange Ronald E.
Shelly William A.
Yoder Ronald W.
Bull HN Information Systems Inc.
Lall Parshotam S.
Maung Zarni
Phillips J. H.
Solakian J. S.
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