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:
Jul. 12, 2005
Filed:
Sep. 09, 2002
Albert H. Chang, Houston, TX (US);
Jeff M. Carlson, Cypress, TX (US);
Christopher Garza, Houston, TX (US);
Mark J. Thompson, Spring, TX (US);
Albert H. Chang, Houston, TX (US);
Jeff M. Carlson, Cypress, TX (US);
Christopher Garza, Houston, TX (US);
Mark J. Thompson, Spring, TX (US);
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
A single read request to a memory controller generates multiple read actions along with XOR/DATUM manipulation of that read data. Fewer memory transfers are required to accomplish a RAID/DATUM parity update. This allows for higher system performance when memory bandwidth is the limiting system component. In implementation, a read buffer with XOR capability is tightly coupled to a memory controller. New parity does not need to be stored in the controller's memory. Instead, a memory read initiates multiple reads from memory based on an address decode. The data from the reads are multiplied and XOR'd before being returned to the requestor. In the case of a PCI-X requestor, this occurs as a split-completion.