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. 17, 1996
Filed:
Sep. 08, 1993
Osamu Nishii, Kokubunji, JP;
Takashi Inagawa, Owari-Asahi, JP;
Makoto Hanawa, Niiza, JP;
Hiroshi Takeda, Higashi-Yamato, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A processor for use in a data processing system with a cache RAM and main memory has a control pin for deactivating the driving of the data bus without deactivating that of the address bus during a write cycle. This capability is useful during a cache storing operation following a miss for performing a write operation without the requirement of additional address storing circuitry. In particular, during a cache storing operation, the processor can drive the address bus while control of the data bus by the processor is floated. Then, the data in main memory can be put on the data bus and transferred into the cache memory. Once the data is transferred to the cache memory, the original write operation can be completed.