Waveform has a relative starting phase, it may be not intersection). For an infinite
burst, the Sync Signal is the same as the Sync Signal of the continuous Signal.
For the External Gated Burst, the Sync Signal follows the External Gated Signal.
But, please note that this signal will not turn Level Low until the last period end (If
the Waveform has a relative starting phase, it may be not intersection).