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:
Aug. 31, 1999
Filed:
Feb. 28, 1997
Shahe H Krakirian, Milpitas, CA (US);
Adaptec, Inc., Milpitas, CA (US);
Abstract
A method and apparatus for performing XOR operations on a hard disk drive are provided, which optimize the buffer bandwidth with minimal logic added to the hard disk controller integrated circuit. This is achieved by first storing data from a first source in the buffer memory in an interleaved fashion (i.e. at memory locations having addresses k, k+2 . . . ,k+2n-2) and then sequentially reading each bit set from the buffer memory, XORing it with a corresponding bit set read from a second source and writing the result at the next consecutive location in the buffer memory (i.e. at memory locations having addresses k+1, k+3 . . . k+2n-1). The method can be implemented on existing hard disk controllers with minimal modifications to the hardware. In addition, an embodiment of the invention allows for decoupling of the XOR operation from disk and host transfers, allowing each of those transfers to occur at their maximum rate and using the remaining buffer bandwidth for the XOR operation.