发明申请
US20080140925A1 APPARATUS AND METHOD FOR MULTI-HIT DETECTION IN ASSOCIATIVE MEMORIES 有权
相关记忆中多重检测的装置和方法

  • 专利标题: APPARATUS AND METHOD FOR MULTI-HIT DETECTION IN ASSOCIATIVE MEMORIES
  • 专利标题(中): 相关记忆中多重检测的装置和方法
  • 申请号: US11609464
    申请日: 2006-12-12
  • 公开(公告)号: US20080140925A1
    公开(公告)日: 2008-06-12
  • 发明人: MICHAEL J. LEEBao G. Truong
  • 申请人: MICHAEL J. LEEBao G. Truong
  • 主分类号: G06F12/00
  • IPC分类号: G06F12/00
APPARATUS AND METHOD FOR MULTI-HIT DETECTION IN ASSOCIATIVE MEMORIES
摘要:
An apparatus and method for multiple hit (multi-hit) detection in associative memories, such as a content addressable memory (CAM), are provided. The illustrative embodiments include a hit bitline that discharges as RAM side entries of the associative memory are accessed. The hit bitline is precharged high and pulled low by a series of devices that are activated as each RAM side row is accessed. As more RAM side rows are accessed, the hit bitline drops lower in voltage. The hit bitline drives an inverter with a threshold set such that any voltage equal to or lower than the threshold indicates a multi-hit situation. Any voltage higher than the threshold indicates a single hit or “no-hit” situation. Thus, from the voltage of the hit bitline, the presence of a multi-hit condition may be detected.
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