probe_freq :
A frequency probe for a clock signal.

The probe_freq primitive measures the frequency of an xbit-typed periodic clock input (in) and records its waveform into a file. The primitive uses a clk_to_freq primitive to measure the frequency of in.

The parameter filename sets the name of the waveform file, of which extension determines the waveform format (e.g. “.jez” for JEZ and “.fsdb” for FSDB). In case of recording in JEZ format, the parameter format defines whether the data are recorded in a binary (“jezbinary”) or ascii (“jezascii”) format. The parameters start and stop define when the recording begins and ends, respectively.

Input/Output Terminals

Name	I/O	Type	Description
in	input	xbit	signal to measure the frequency from

Parameters

Name	Type	Default	Unit	Description
filename	string	“xmodel.jez”	None	output filename
format	string	“jezbinary”	None	format version
start	real	0.0	seconds	abs. time to start recording
stop	real	-1.0	seconds	abs. time to stop recording