发明授权
US5553255A Data processor with programmable levels of speculative instruction
fetching and method of operation
失效
数据处理器具有可编程级别的推测指令提取和操作方法
- 专利标题： Data processor with programmable levels of speculative instruction fetching and method of operation
- 专利标题（中）： 数据处理器具有可编程级别的推测指令提取和操作方法
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申请号： US429439申请日： 1995-04-27
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公开(公告)号： US5553255A公开(公告)日： 1996-09-03
- 发明人: Danny K. Jain , David S. Levitan , Paul C. Rossbach
- 申请人： Danny K. Jain , David S. Levitan , Paul C. Rossbach
- 申请人地址： IL Schaumburg NY Armonk
- 专利权人： Motorola, Inc.,International Business Machines
- 当前专利权人： Motorola, Inc.,International Business Machines
- 当前专利权人地址： IL Schaumburg NY Armonk
- 主分类号： G06F9/38
- IPC分类号： G06F9/38
摘要：
A data processor (12) has a branch prediction unit (28) that predicts conditional branch instructions and a control unit (70) therein that monitors the number of unresolved branch instructions. This control unit selectively allows the data processor to fetch the instructions indicated by the branch prediction unit from an external memory system depending upon the number of unresolved branch instructions. The particular threshold number of unresolved branch instructions is user programmable. The data processor thereby limits its bus accesses to those occasions when it is reasonably sure that it will need the indicated instructions.
公开/授权文献
- USD280829S Photographic light bracket 公开/授权日：1985-10-01
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