Monday, January 11, 2010

Edge events

In timing mode, the pattern resources operate the same as they do in state mode. Not in common is the “edge event.” On one or more signals within a label, a low-to-high or high-to-low transition (or both) can be specified. If edge events are used together with a pattern, the trigger criterion is considered true when all “zero/one/don’t care” criteria are met and when the signals with an edge specification transition in the correct way. The desired trigger point can only be achieved by selecting the high-to-low edge of signal STROBE.

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