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:
Oct. 24, 2000
Filed:
May. 06, 1998
Paul Tien, Fremont, CA (US);
Cheng-Yeuan Tsay, Pleasanton, CA (US);
Rsong-Hsiang Shiao, Fremont, CA (US);
ESS Technolgoy Inc., Fremont, CA (US);
Abstract
A transparent direct memory access method comprises emulating an ISA-bus mapped direct memory access controller (ISA-DMAC) with a PCI-bus mapped direct memory access controller (PCI-DMAC). The ISA-DMAC exists, but there may not actually be any resources mapped into the ISA-bus space. Write snooping by the PCI-DMAC of a PCI-bus processor detects whenever an attempt is made to write the ISA-DMAC, and copies the data written into the ISA-DMAC registers into a corresponding register of the PCI-DMAC. The direct memory access operation commanded by the PCI-bus processor of the ISA-DMAC is performed by the PCI-DMAC in the PCI-bus resource space. When the direct memory access operation is completed, the PCI-DMAC updates its registers and does a write back to update the ISA-DMAC registers. The PCI-bus processor can then read the PCI-DMAC directly for status, or if legacy software is running the ISA-DMAC will respond with the appropriate register value.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile