trig_edge :
A trigger generator for an xbit-typed signal’s transition events.
The trig_edge
primitive generates an xbit-typed trigger out
when an xbit-typed signal in
has the (N+k*P)-th transition after a specified delay, where k is 0, 1, 2, and so on. The triggering count N, period P, and delay are defined by the parameters times
, period
, and delay
, respectively. When the parameter times
is less than or equal to 0, the primitive triggers out
whenever in
has a transition after the delay. The parameter direction
specifies whether the primitive detects the rising events only (+1), falling events only (-1), or both (0).
The xbit-typed trigger out
can be used as an input to the measurement primitives to measure the time instants, delays, periods, etc. of the triggering events. The trigger signal is initialized to X and changes to 1 when the first event occurs. The trigger output out
then toggles to a different value (0 or 1) whenever a subsequent event occurs.
Input/Output Terminals
Name | I/O | Type | Description |
out | output | xbit | output trigger |
in | input | xbit | input signal |
Parameters
Name | Type | Default | Unit | Description |
direction | integer | 0 | None | crossing direction |
delay | real | 0.0 | seconds | triggering delay |
times | integer | 0 | None | triggering count |
period | integer | 0 | None | triggering period |