meas_freq :
A primitive for measuring the frequency of a trigger.

The meas_freq primitive measures the frequency of a trigger input trig, by measuring the time difference between its two consecutive events. The real-typed output out indicates the frequency measured from the last two trigger events of the input. It initially takes an “NaN (not-a-number)” value until the first frequency measurement can be made.

Input/Output Terminals

Name	I/O	Type	Description
out	output	real	value
trig	input	xbit	trigger