Approximate search TCAM matching system based on current mode measurement

• Main Authors: CHEN YUGUO, HUANG WENTAO, YIN XUNZHAO, WANG GUANTAO, ZHUO CHENG
• Format: Patent
• Language: Chinese; English
• Published: 09.08.2022
• Subjects: INFORMATION STORAGE; PHYSICS; STATIC STORES

The invention discloses an approximate search TCAM (ternary content addressable memory) matching system based on current mode measurement, which comprises a TCAM array and a sensing amplifier, the TCAM array is used as a pre-stage circuit, and the sensing amplifier is used as a post-stage circuit and is used for receiving analog current signals output by each row of TCAM units in the TCAM array and converting the analog current signals into digital pulses of which the quantity is equal to the mismatching degree. According to the invention, the matching discharge characteristic of the TCAM is fully utilized to realize the brand-new design of the TCAM approximate search array and the measurement circuit, the measurement of the search mismatching bit number is realized, and the expandability of the storage array is obtained. 本发明公开了一种基于电流模测量的近似搜索TCAM匹配系统，包括TCAM阵列和感测放大器，TCAM阵列作为前级电路，感测放大器作为后级电路，用于接受TCAM阵列中每行TCAM单元输出的模拟电流信号并转化为与不匹配度等量的数字脉冲。本发明充分利用了TCAM的匹配放电特性实现了全新的TCAM近似搜索阵列及测量电路的设计，实现了搜索不匹配比特数的测量，并获得了存储阵列的可扩展性。