Write before read interlock for recovery unit operands

Details Write before read interlock for recovery unit operands Write before read interlock for recovery unit operands

2005-10-04

2005-10-04

Pan, Daniel H. (Department: 2183)

Electrical computers and digital processing systems: processing

Dynamic instruction dependency checking, monitoring or...

C712S217000

Reexamination Certificate

active

06952763

ABSTRACT:
An exemplary embodiment of the invention is a method for holding up recovery unit (R-unit) operands for a minimum number of cycles, until all prior updates have completed, by comparing addresses in at least one queue and interlocking valid R-unit register address matches. The method includes receiving a plurality of R-unit register addresses and storing these R-unit register addresses in at least one queue. This method includes a write queue, a read queue, and a pre-write queue. Further, this method requires accessing these queues and comparing the R-unit register addresses therein. After the addresses are compared, the method determines whether there is a valid match between the R-unit register addresses and if so, implementing one of more interlocks.

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InstantWeb Online Computing Dictionary; “Microcode”; http://www.instantweb.com/d/dictionary/foldoc.cgi?query=microcode; Nov. 26, 1996.

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