Hybrid write back/write through cache having a streamlined four

Details Hybrid write back/write through cache having a streamlined four Hybrid write back/write through cache having a streamlined four

1993-10-25

1996-05-28

Kim, Matthew M.

Boots, shoes, and leggings

395469, 395470, 395472, 395473, 364DIG1, 364DIG2, 36424341, 3642384, G06F 1208

Patent

active

055220576

ABSTRACT:
A cache controller of a hybrid write back/write through cache of a uniprocessor system is provided with state transition and complimentary logic that implements a streamlined (modified, exclusive, shared and invalid) MESI cache coherency protocol, (modified, exclusive, pseudo shared and invalid) ME.SIGMA.I, having a pseudo shared state ".SIGMA.". Under the streamlined ME.SIGMA.I, a cache line will enter the .SIGMA. state only through allocation. From the .SIGMA. state, the cache line will remain in the .SIGMA. state when it is read, written into, or snoop-inquired, and it will transition into the I state when it is snoop-invalidated. Additionally, if a cache line in the .SIGMA. state is written into, the cache controller will always cause the data to be written to memory, effectively treating the cache line as a dedicated write through cache line.

REFERENCES:
patent: 4755930 (1988-07-01), Wilson, Jr. et al.
patent: 4959777 (1990-09-01), Holman, Jr.
patent: 5119485 (1992-06-01), Ledbetter, Jr. et al.
patent: 5146603 (1992-09-01), Frost et al.
patent: 5241664 (1993-08-01), Ohba et al.
patent: 5297269 (1994-03-01), Donaldson et al.
patent: 5303362 (1994-04-01), Butts, Jr. et al.
patent: 5325503 (1994-06-01), Stevens et al.
patent: 5353415 (1994-10-01), Wolford et al.
patent: 5355467 (1994-10-01), MacWilliams et al.
patent: 5369753 (1994-11-01), Tipley
patent: 5394555 (1995-02-01), Hunter et al.
patent: 5426765 (1995-06-01), Stevens et al.

Affiliated with

Also associated with

Rating

Hybrid write back/write through cache having a streamlined four does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Hybrid write back/write through cache having a streamlined four , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hybrid write back/write through cache having a streamlined four will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-794779