System for data alignment by using mask and alignment data just

Details System for data alignment by using mask and alignment data just System for data alignment by using mask and alignment data just

1997-08-11

1998-10-13

Lim, Krisna

395565, G06F 700

Patent

active

058226206

ABSTRACT:
A method and implementing system are provided in which specific byte requests made by a functional unit within a computer system effect the return of a word containing the requested byte to a register device within a CPU. The returned word is stored "as is" and without alignment, together with mask and alignment data indicative of the location of the requested byte within the stored word. Alignment relative to the requested byte is thereafter accomplished using the mask and alignment data just before use of the requested byte by the functional unit. The alignment function is thereby accomplished outside of the processor critical path which obviates the typical memory-processor mismatch delay inherent in prior art data alignment networks and substantially shortens the critical path in the memory access stage of the processor's pipeline.

REFERENCES:
patent: 5276891 (1994-01-01), Patel
patent: 5392406 (1995-02-01), Petersen
patent: 5517627 (1996-05-01), Petersen
patent: 5526296 (1996-06-01), Nakahara et al.
patent: 5619715 (1997-04-01), Dinkjian et al.
patent: 5701517 (1997-12-01), Carpenter

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