发明授权
- 专利标题: Content addressable memory (“CAM”)
- 专利标题(中): 内容可寻址存储器(“CAM”)
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申请号: US13548382申请日: 2012-07-13
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公开(公告)号: US08908407B1公开(公告)日: 2014-12-09
- 发明人: Brent Steven Haukness , Mark D. Kellam
- 申请人: Brent Steven Haukness , Mark D. Kellam
- 申请人地址: US CA Sunnyvale
- 专利权人: Rambus Inc.
- 当前专利权人: Rambus Inc.
- 当前专利权人地址: US CA Sunnyvale
- 代理商 Marc P. Schuyler
- 主分类号: G11C15/00
- IPC分类号: G11C15/00 ; G11C15/04 ; G11C15/02
摘要:
A content addressable memory device based on an extremely compact design, potentially as small as 16F2 per memory cell. One embodiment is based on cells having two memory storage elements, such as RRAM elements. Each RRAM element and a respective FET are connected in series between a common matchline and a respective bitline. Cell content for each cell is matched against a bit of a search word by applying voltages to the respective bitlines dependent upon bit value and causing one of the two RRAM elements for each cell to discharge the matchline over a low resistance path in event of mismatch between the cell content and the bit. If no “quick” discharge occurs for multiple cells of a row, then a match is detected. In addition, a matchline recharge path to a high voltage bitline is substantially eliminated by controlling the FETs with specific wordline voltages.
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