Speculative cache tag evaluation

Details Speculative cache tag evaluation Speculative cache tag evaluation

2006-12-27

2010-11-23

Abraham, Esaw T (Department: 2112)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S010000, C714S799000

Reexamination Certificate

active

07840874

ABSTRACT:
A cache tag comparison unit in a cache controller evaluates tag data and error correction codes to determine if there is a cache hit or miss. The cache tag comparison unit speculatively compares the tag data with the request tag without regard to error correction. The error correction code verifies whether this initial comparison is correct and provides a confirmed cache hit or miss signal. The tag data is compared with the request tag to determine a provisional cache hit or miss, and in parallel, the error correction code is evaluated. If the error code evaluation indicates errors in the tag data, a provisional cache hit is converted into a cache miss if errors are responsible for a false match. If the error code evaluation identifies the locations of errors, a provisional cache miss is converted into a cache hit if the errors are responsible for the mismatch.

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