发明授权
US5448523A BICMOS cache TAG having small signal exclusive OR for TAG comparison
失效
BICMOS缓存TAG具有小信号异或用于TAG比较
- 专利标题： BICMOS cache TAG having small signal exclusive OR for TAG comparison
- 专利标题（中）： BICMOS缓存TAG具有小信号异或用于TAG比较
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申请号： US306564申请日： 1994-09-15
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公开(公告)号： US5448523A公开(公告)日： 1995-09-05
- 发明人: James C. Lewis , Mark D. Bader
- 申请人： James C. Lewis , Mark D. Bader
- 申请人地址： IL Schaumburg
- 专利权人： Motorola Inc.
- 当前专利权人： Motorola Inc.
- 当前专利权人地址： IL Schaumburg
- 主分类号： G06F12/08
- IPC分类号： G06F12/08 ; G11C15/04 ; G11C15/00
摘要：
A cache TAG RAM (25) includes a TAG array (26), a small signal exclusive OR logic circuit (33, 34), a sense amplifier (36, 37), and another exclusive OR logic circuit (30, 31). A comparison of a stored TAG address to the input address signal is made by the small signal exclusive OR logic circuit (33, 34) to provide a hit signal very quickly. The stored TAG address that is lost during the exclusive OR operation is recovered by performing another exclusive OR on the match information and the input address signal. By using a small signal exclusive OR circuit to perform a comparison early, the hit signal can be generated very quickly.
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