Patent ID: 7856524
Filing Date: 2010-12-21
Classification: G11C,H04L

Abstract:
1. A content addressable memory (CAM) device, comprising: a CAM array coupled to receive a comparand; and a filter circuit coupled to the CAM array, wherein the filter circuit is coupled to receive input data, the input data including a first bit having a first position and a second bit having a second position being one of before or after the first position in the input data, wherein the filter circuit is configured to form a comparand from the input data by providing the first bit in the first position and transposing the second bit with a third bit in a third position in the comparand, the third position being the other of before or after the first position, wherein the filter circuit is configured to form the comparand from the input data without moving any bit in the input data other than the bit in the second position and the bit in the third position, wherein the third position is different than the first position and the second position, and wherein the filter circuit comprises switch circuitry coupled to receive the input data, and control logic coupled to the switch circuitry.