Cache unit information replacement apparatus

Details Cache unit information replacement apparatus Cache unit information replacement apparatus

G - Physics

06

F

354/239

G06F 9/26 (2006.01) G06F 12/12 (2006.01)

Patent

CA 1134515

ABSTRACT OF THE DISCLOSURE A cache unit includes a cache store organized into a number of levels to provide a fast access to instructions and data words. Directory circuits, associated with the cache store, contain address infor- mation identifying those instructions and data words stored in the cache store. The cache unit has at least one instruction register for storing address and level signals fox specifying the location of the next instruction to be fetched and transferred to the processing unit. Replacement circuits are included which, during normal operation, assign cache locations sequentially for replacing old information with new information. The cache unit further includes detection apparatus for detecting a conflict condition resulting in an improper assignment. The detection apparatus, upon detecting such a condition, advances the replace- ment circuits forward for assigning the next sequential group of locations or level inhibiting it from making its normal location assignment. It also inhibits the directory circuits from writing the necessary informa- tion therein required for making the location assign- ment and prevents the information which produced the conflict from being written into cache store when re- ceived from memory.

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