Specify whether test bench forces clock input signals
'on' (default)
Selected (default)
Specify that the test bench forces the clock input signals. When this option is set, the clock high and low time settings control the clock waveform.
'off'
Cleared
Specify that a user-defined external source forces the clock input signals.
To set this property, use hdlset_param or makehdl. To view the property value, use hdlget_param.
ClockLowTime, ClockHighTime, ForceClockEnable, ForceReset, HoldTime