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. 15, 1998
Filed:
Oct. 12, 1995
Yasuaki Kamiya, Hamamatsu, JP;
Yamaha Corporation, Hamamatsu, JP;
Abstract
A method and a data transfer apparatus capable of handling DMA block transfer interruptions are provided. The data transfer apparatus includes a plurality of direct memory access (DMA) channels each having different priorities and at least one backup channel information memory for saving control information necessary for a restart of an interrupted DMA transfer through one of the DMA channels. The data transfer apparatus further includes a control means responsive to transfer commands which command DMA transfers through the DMA channels. In addition, the control means executes various interrupt handling steps when a transfer command interrupts an execution of a DMA transfer through one of the DMA channels having a lower priority than the priority of the DMA channel used by the interrupting transfer command, so that an interruption of an important data transfer can be prevented.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile