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:
Jan. 27, 2004
Filed:
Dec. 18, 2001
Yoshihiro Hiji, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
The read position or write position of data is decided by the base address of a ring buffer and an offset from the base address and the offset is updated by the amount of DMA-transferred data. When the offset becomes equal to or more than a value that indicates a total amount of transferred data, the offset is reset to zero to generate an address for circulating through and accessing the ring buffer. Moreover, a stop address showing the stop position of the DMA transfer operation is set to update the stop address by the amount of data read from or written in the ring buffer without depending on the DMA transfer operation. When the offset coincides with the stop address, the DMA transfer operation is stopped.