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:
Dec. 10, 2002
Filed:
Aug. 23, 1999
Thai H. Pham, Pflugerville, TX (US);
Pratik M. Mehta, Austin, TX (US);
Michael S. Quimby, Austin, TX (US);
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
Abstract
A direct memory access (DMA) controller provides seven DMA channels configurable for a PC/AT compatible mode or an enhanced mode. In an enhanced mode of the DMA controller, three DMA master channels on a master DMA controller and a DMA channel on a slave DMA controller are individually configurable to be either 8-bit or 16-bit DMA channels. In addition, in the enhanced mode, a memory address can increment or decrement across a memory page boundary. The DMA controller includes a transfer count register selectively configured for 16-bit operation or 24-bit operation. The DMA controller also includes address generation logic selectively configured for 24-bit operation or 28-bit operation. In the PC/AT compatible mode, the DMA controller supports three 16-bit channels and four 8-bit channels. The DMA controller thus provides DMA channel width configurability.