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:
Feb. 16, 1999
Filed:
Mar. 12, 1997
Osamu Nishii, Inagi, JP;
Nobuyuki Hayashi, Hadano, JP;
Noriharu Hiratsuka, Fujimi, JP;
Tetsuhiko Okada, Hachioji, JP;
Hiroshi Takeda, Higashiyamato, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A data processing system including a processor LSI and a DRAM divided into banks, for increasing a ratio of using a fast operation mode for omitting transfer of a row address to the DRAM and for minimizing the amount of logics external to the processor LSI. The processor LSI includes row address registers for holding recent row addresses corresponding to the banks. The contents of the row address registers are compared with an accessed address by a comparator to check for each bank whether the fast operation mode is possible. As long as the row address does not change in each bank, the fast operation mode can be used, thus making it possible to speed up operations, for example in block copy processing.