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. 04, 2001
Filed:
Feb. 25, 1999
Applicant:
Inventor:
Kunihiro Ohara, Kasugai, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F 1/336 ; G06F 1/3362 ;
U.S. Cl.
CPC ...
G06F 1/336 ; G06F 1/3362 ;
Abstract
A bus controller for a CCD digital still camera arbitrates competing requests by multiple microcontrollers for a shared memory. One of the microcontrollers is designated to have a higher priority than the other microcontroller(s). In the case of competing requests, while one microcontroller is granted access to the memory, the other microcontroller performs other processing, and polls a memory status register to determine when the memory is available. Since the waiting processor performs other operations, as opposed to idling, the efficiency of the microcontroller is improved.