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:
Jun. 28, 2005
Filed:
May. 11, 2000
Dennis Gates, Witchita, KS (US);
Rodney A. Dekoning, Augusta, KS (US);
Dennis Gates, Witchita, KS (US);
Rodney A. DeKoning, Augusta, KS (US);
LSI Logic Corporation, Milpitas, CA (US);
Abstract
A parity assist circuit that provides multiple XOR calculations using a scatter-gather list is disclosed. The parity assist circuit includes a control circuit that obtains a plurality of source operands in response to a scatter-gather list, and an XOR engine that provides a plurality of XOR products computed from the supplied source operands. Destination and length parameters in the scatter-gather list are used by the XOR engine to store the XOR computation product and to determine the length of the data in the source and destination blocks to be computed. Preferably, the parity assist circuit is part of a RAID controller that includes a processor and a cache memory. The parity assist circuit preferably utilizes the scatter-gather list to gather required source operands from a memory and to scatter multiple XOR products to the memory before sending an interrupt to the processor or receiving additional setup instructions from the processor, thereby providing rapid and efficient parity calculations and improving overall system performance of the RAID storage subsystem.