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:
Aug. 01, 2000
Filed:
Dec. 03, 1997
Shinji Furuya, Moriguchi, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A data transfer apparatus is provided for transferring data with a DMA method between a plurality of disk apparatuses and a memory using a DMA command table. A processor generates the DMA command table composed of an array of the DMA commands which are each composed of an address (starting address) of the data area and a size of data to be transferred. A disk access unit transfers data between the disk apparatuses and the memory using the DMA command table. When it is judged that the disk apparatus currently transferring data has temporarily released the bus use right, the processor, concurrently in preparation for the resumption of the data transfer, updates the DMA command table by deleting DMA commands having been executed and adding new DMA commands. This eliminates or reduces the generation of the table update interrupt.