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:
May. 26, 2009
Filed:
Nov. 15, 2005
Alon Regev, Woodland Hills, CA (US);
Zvi Regev, West Hills, CA (US);
Alon Regev, Woodland Hills, CA (US);
Zvi Regev, West Hills, CA (US);
Micron Technology, Inc., Boise, ID (US);
Abstract
A CAM includes a parity bit system for error detection. In one embodiment, in each CAM cell, the data portion has its own data parity bit while the status portion has an independent status parity bit. The status parity bit is recalculated and updated whenever a status bit in the entry is changed. In another embodiment, each status bit is provided with a corresponding shadow status bit. Each status bit and its corresponding shadow status bit is always loaded with the same data. In this manner, every change 1-bit change to a status bit is made as two identical 1-bit changes to the status bit and its corresponding shadow status bit. The two identical 1-bit changes are parity neutral, thereby permitting status changes without requiring recomputing and saving a new parity.