Multiple alternate path pipelined microsequencer and method for

Details Multiple alternate path pipelined microsequencer and method for Multiple alternate path pipelined microsequencer and method for

1991-08-30

1994-12-27

Lall, Parshotam S.

G06F 926

Patent

active

053773357

ABSTRACT:
An alternate path selection structure is provided which reduces the effects of aborting an operation. The present invention comprises a structure and method that allows efficient retrieval of alternate paths to pursue in a microcode sequence. The present invention is useful in a computer system having a central processing unit, input/output units and a memory unit, each of which include means for generating condition signals indicative of the current status thereof, wherein the central processing unit includes a microsequencer comprising storage means for storing microinstructions for the central processing unit, the input/output units and the memory unit; means for storing the last microinstruction retrieved from the storage means; means for generating an alternate address to the storage means in response to the condition signals; means for producing an abort signal also in response to the condition signals; and, means for selecting either the microinstruction retrieved from the storage means or the last microinstruction in the means for storing in response to the state of the abort signal.

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