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:
Apr. 25, 2000
Filed:
Mar. 27, 1997
Applicant:
Inventor:
Daniel C Robbins, Durham, NC (US);
Assignee:
Mitsubishi Semiconductor America, Inc., Durham, NC (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
710 22 ;
Abstract
A device driver initiates a DMA transfer and repeatedly reads a semaphore from a specified location in system memory. Upon completion of a DMA transfer, a DMA controller writes a semaphore containing status information to the specified location in system memory, informing the device driver that the DMA transfer is completed. A cache memory for the specified location in system memory is provided to further reduce the latency between DMA transfers.