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11. 发明授权

US5659720A Computer control device for managing a timer array 失效
标题翻译：用于管理定时器阵列的计算机控制装置
公开(公告)号：US5659720A
公开(公告)日：1997-08-19
申请号：US429916
申请日：1995-04-27
申请人： Peter Fiacco , Vi Chau , Jennifer Sullivan
发明人： Peter Fiacco , Vi Chau , Jennifer Sullivan
IPC分类号： G06F1/14 , G06F11/00 , G06F11/34
CPC分类号： G06F11/0757 , G06F1/14 , G06F11/3466
摘要： A method and apparatus for establishing a large number of EDTOV timers, each determining when an event has failed to occur on an exchange of a communications protocol. Values for each timer are maintained as a timer array. The entire timer array is read at regular scan intervals by a state machine and decremented by four associated hardware decrementers, four timers at one time. A Scan Interval variable determines the scan interval. The present invention is capable of scan intervals of up to 100 ns. Active time values are read, checked for zero, decremented preferably by one, and written back to the timer array. If a timer is detected as having timed out (equal to zero), then a value which identifies the exchange associated with that timer is logged into a time-out FIFO and "FF"h is written back into the timer. At the heart of the invention is the efficient use of dedicated hardware to decrement or otherwise alter the values of each timer as appropriate, and the use of a dedicated state machine to read values for each timer, provide the value to the hardware, and then load the new value of each timer back into memory.
摘要翻译：一种用于建立大量EDTOV定时器的方法和装置，每个定时器确定事件何时在通信协议的交换上发生。每个定时器的值被保持为定时器阵列。整个定时器阵列由状态机以规则的扫描间隔读取，并由四个关联的硬件递减器一次递减四个定时器。扫描间隔变量确定扫描间隔。本发明能够进行高达100ns的扫描间隔。活动时间值被读取，检查为零，最好递减1，并写回定时器阵列。如果检测到定时器具有超时（等于零），则将与该定时器相关联的交换的值记录到超时FIFO中，并将“FF”h写回定时器。本发明的核心在于适当地有效利用专用硬件来递减或以其他方式改变每个定时器的值，并且使用专用状态机来读取每个定时器的值，为硬件提供值，然后将每个定时器的新值加载到内存中。

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