Late cancel method and apparatus for a high performance micropro

Details Late cancel method and apparatus for a high performance micropro Late cancel method and apparatus for a high performance micropro

1993-04-14

1996-02-06

Swann, Tod R.

Boots, shoes, and leggings

395467, 395495, 3642318, 3642624, 3642814, 36429624, 36496426, 364DIG1, 364DIG2, G06F 1300

Patent

active

054902657

ABSTRACT:
A late cancel method and apparatus for a high performance microprocessor system is disclosed. The invention is advantageously utilized in a microprocessor system comprising a processor, an external cache memory and a main memory. The processor incorporates logic to determine whether an access directed to the external cache memory has resulted in a cache hit or miss. In operation, the processor requests a desired instruction from the external cache memory which provides a cache word and cache tag to the processor before a validity determination has been made. The processor determines whether the instruction is valid, while concurrently, the processor begins to pre-decode and decode the cache word as an instruction. If the processor determines that a cache hit has occurred, the cache word proceeds normally through decoding to execution by the processor. Alternatively, if the processor determines that a cache miss has occurred, the cache word is canceled such that the results of any pre-decoding or decoding are eliminated from the processor pipeline, and the instruction is not executed. The processor further halts the processor pipeline and obtains the desired instruction from main memory.

REFERENCES:
patent: H1291 (1994-02-01), Hinton et al.
patent: 4991078 (1991-02-01), Wilhelm et al.
patent: 5136696 (1992-08-01), Beckwith et al.
patent: 5287467 (1994-02-01), Blaner et al.
patent: 5345576 (1994-09-01), Lee et al.
patent: 5390355 (1995-02-01), Horst

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