The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 10, 1991
Filed:
May. 02, 1989
Applicant:
Inventor:
Tsuneo Funabashi, Tokyo, JP;
Assignee:
Hitachi, Ltd., Toyko, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
364200 ; 3642384 ; 364243 ; 36424341 ; 3642434 ; 364254 ; 3642547 ; 3642543 ; 364260 ; 3642602 ;
Abstract
When a CPU outputs an address for read-out from a memory, access to a cache memory is immediately started by use of its address signal, and in the mean time a cache controller determines whether or not the data required by the CPU exists in the cache memory and, if so, generates a selection signal for outputting only the data read out from a desired bank of the cache memory to a data bus. Acccordingly, the time necessary for address comparison in the cache controller is not added to the access cycle time of the cache memory so that the overall access time can be shortened and the through-put of the system can be improved.