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:
Mar. 30, 1999
Filed:
Dec. 31, 1996
Jay Li, Milpitas, CA (US);
Mark Williams, San Jose, CA (US);
OPTi Inc., Milpitas, CA (US);
Abstract
A system and method in accordance with the invention allows the emulation of a DMA transfer between a device such as a CD-ROM which is incapable of a bus-mastering mode of operation (e.g., a DMA transfer) and a memory. Following receipt of an interrupt request, a system in accordance with the invention generates an I/O access cycle to the device, retrieves data and stores the data in a buffer. Following data retrieval, the system transfers the data to host memory. Once data is transferred to host memory, an interrupt is generated to the host processor. Thus, host processor resources are not required to perform a data transfer with devices unable to become bus-masters.