发明授权
- 专利标题： DMA controller with dynamically variable access priority
- 专利标题（中）： DMA控制器具有动态变量访问优先级
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申请号： US09521196申请日： 2000-03-07
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公开(公告)号： US06615291B1公开(公告)日： 2003-09-02
- 发明人: Nobuo Kamei , Kenichi Morita , Takeshi Minami , Kazunori Shionoya , Munehiro Nakatani
- 申请人： Nobuo Kamei , Kenichi Morita , Takeshi Minami , Kazunori Shionoya , Munehiro Nakatani
- 优先权： JP11-060441 19990308; JP11-064388 19990311; JP11-066451 19990312; JP11-073181 19990318; JP11-081218 19990325; JP11-085210 19990329; JP11-357320 19991216
- 主分类号： G06F1328
- IPC分类号： G06F1328
摘要：
A bus monitor section 8 calculates bus-occupancy rate for each of the DMA control sections 1 to 3 connected to a bus 5 in accordance with bus-use permission signals ack1 to ack3, respectively. Furthermore, a bus-use reconcilement section 6 changes manners of bus-use reconcilement control when the sum of a plurality of bus-occupancy rate exceeds “50”, a predetermined threshold. Thereby, this method avoids occurrences such that a specific device occupies the bus 5 or vice versa, a specific device cannot get access to the bus 5.