- 专利标题: Apparatus and method for detecting multiple hits in CAM arrays
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申请号: US10880719申请日: 2004-06-30
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公开(公告)号: US07092270B2公开(公告)日: 2006-08-15
- 发明人: Michael Ju Hyeok Lee , Sheldon B. Levenstein , Edelmar Seewann
- 申请人: Michael Ju Hyeok Lee , Sheldon B. Levenstein , Edelmar Seewann
- 申请人地址: US NY Armonk
- 专利权人: International Business Machines Corporation
- 当前专利权人: International Business Machines Corporation
- 当前专利权人地址: US NY Armonk
- 代理商 Duke W. Yee; Thomas E. Tyson; Cathrine K. Kinslow
- 主分类号: G11C15/00
- IPC分类号: G11C15/00
摘要:
An apparatus and method are disclosed for detecting multiple hits in CAM arrays. A binary address value is stored for each entry of the CAM array and is output to identify the matching entry for a single hit. However, to facilitate multiple hit detection, both the true and complement components of this address are stored and output to determine whether or not a multiple hit occurred. If a multiple hit occurs (e.g., more than one address location has been matched), all the bits that make up the binary address and the complement will not be complements of each other and a multiple hit condition can be detected by XORing each bit of an address location value with the complement of that address location value. If the XORed bits are equal to “1”, then a single hit has occurred. Otherwise, a multiple hit has occurred.
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