Multilevel cache system with graceful degradation capability

Details Multilevel cache system with graceful degradation capability Multilevel cache system with graceful degradation capability

1982-03-31

1984-08-07

Smith, Jerry

Boots, shoes, and leggings

G06F 1300

Patent

active

044647174

ABSTRACT:
The directory and cache store of a multilevel set associative cache system are organized in levels of memory locations. Round robin replacement apparatus is used to identify in which one of the multilevels information is to be replaced. The directory includes parity detection apparatus for detecting errors in the addresses being written in the directory during a cache memory cycle of operation. Control apparatus combines such parity errors with signals indicative of directory hits to produce invalid hit detection signals. The control apparatus in response to the occurrence of a first invalid hit detection signal conditions the round robin apparatus as well as other portions of the cache system to limit cache operation to those sections whose levels are error free thereby gracefully degrading cache operation.

REFERENCES:
patent: T932005 (1975-03-01), Kruskal
patent: 3685020 (1972-08-01), Meade
patent: 3820078 (1974-06-01), Curley et al.
patent: 3848234 (1974-11-01), MacDonald
patent: 4020466 (1977-04-01), Cordi et al.
patent: 4051460 (1977-09-01), Yamada et al.
patent: 4053752 (1977-10-01), DeJohn et al.
patent: 4144566 (1979-03-01), Timsit
patent: 4195342 (1980-03-01), Joyce et al.
patent: 4195343 (1980-03-01), Joyce
patent: 4342084 (1982-07-01), Sager et al.
IBM Technical Disclosure Bulletin, M. W. Bee et al., vol. 13, No. 2, Jul. 1970, "Removal of Failing Buffer Sections in a Buffer Backing Store".
IBM Technical Disclosure, Sep. 1978, vol. 21, No. 6, F. J. Sparacio, Data Processing System with Second Level Cache.

Affiliated with

Also associated with

Rating

Multilevel cache system with graceful degradation capability does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Multilevel cache system with graceful degradation capability, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multilevel cache system with graceful degradation capability will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-605837