发明授权
US06542940B1 Method and apparatus for controlling task execution in a direct memory access controller
有权
用于控制直接存储器存取控制器中任务执行的方法和装置
- 专利标题： Method and apparatus for controlling task execution in a direct memory access controller
- 专利标题（中）： 用于控制直接存储器存取控制器中任务执行的方法和装置
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申请号： US09488367申请日： 2000-01-18
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公开(公告)号： US06542940B1公开(公告)日： 2003-04-01
- 发明人: Gary R. Morrison , Peter J. Myers , Charles Edward Nuckolls
- 申请人： Gary R. Morrison , Peter J. Myers , Charles Edward Nuckolls
- 主分类号： G06F1328
- IPC分类号： G06F1328
摘要：
Method for maintaining an execution interval for a task requestor to a DMA. A timer is provided with two counters, one (34) to maintain the execution interval and the second (32) to track the execution time of a task in the DMA. Each task has a predetermined execution time allowance. A task acknowledge (TACK) signal enables the tracking. A task request signal (TREQ) is generated during each execution interval until the execution time allowance is completed. The length of the second counter is less than the first counter. In one embodiment, if the first counter expires before the execution time allowance is completed, a task error signal (TERR) is illustrated.
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