US 12,142,319 B2
Hybrid type content addressable memory for implementing in-memory-search and operation method thereof
Po-Hao Tseng, Taichung (TW); Tian-Cih Bo, Zhubei (TW); and Feng-Min Lee, Hsinchu (TW)
Assigned to MACRONIX INTERNATIONAL CO., LTD., Hsinchu (TW)
Filed by MACRONIX INTERNATIONAL CO., LTD., Hsinchu (TW)
Filed on Jun. 22, 2022, as Appl. No. 17/846,304.
Prior Publication US 2023/0420047 A1, Dec. 28, 2023
Int. Cl. G11C 15/04 (2006.01)
CPC G11C 15/04 (2013.01) [G11C 15/046 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A content addressable memory (CAM) for implementing in-memory-search, comprising:
a plurality of CAM strings, each of which includes a plurality of CAM cells, wherein the CAM cells store a plurality of existing data; and
at least one sense amplifier circuit, connected to the CAM strings, wherein a plurality of search data are inputted to the CAM strings, a plurality of cell matching results obtained from the CAM cells in each of the CAM strings are integrated via an AND operation to obtain a string matching result, and the string matching results obtained from the CAM strings are integrated via an OR operation,
wherein each of the search data is set via a high input voltage or a low input voltage, each of the CAM cells is set via a high threshold voltage or a low threshold voltage, and the low input voltage is higher than the high threshold voltage.