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. 21, 2003
Filed:
Sep. 24, 1999
Michael J. Peters, Fort Collins, CO (US);
Donald N. Allingham, Fort Collins, CO (US);
Patrick R. Bashford, Fort Collins, CO (US);
Adaptec, Inc., Milpitas, CA (US);
Abstract
The present invention provides bridge device for transferring data using master-specific prefetch sizes. The bridge device is coupled between a first bus and a second bus with the master devices being coupled to the first bus and the slave devices being coupled to the second bus. The bridge device includes a set of prefetch control registers, a prefetch buffer, and bridge control circuitry. The set of prefetch control registers is arranged to store prefetch sizes of data to be prefetched for a set of the master devices with one prefetch control register being provided for a master device. The prefetch buffer is arranged to store data for transfer. The bridge control circuitry is coupled to the prefetch control registers and the prefetch buffer for transferring data between a source device and a destination device. The bridge control circuitry is further arranged to receive a first data transfer request from a selected master device for transferring data between the selected master device and a selected slave device. The bridge control circuitry issues a second data transfer request to the selected slave device for transferring the data. The bridge control circuitry receives the requested data from the source device and stores the received data in the prefetch buffer. The bridge control circuitry transfers the stored data from the prefetch buffer to the destination device when the prefetch buffer receives and stores data size that correspond to the prefetch size stored in a prefetch control register associated with the selected master device.