The VTC core has multiple enable options: the
CLKEN pin (hardware clock enable), and the software enable option
provided via the AXI4-Lite control interface (when
present).
The CLKEN pin cannot ensure synchronization internally to video timing
processing therefore deasserting CLKEN for extended periods of time
might lead to generating incomplete frames or lengthening the period needed to detect
incoming video frame timing.
The CLKEN pin facilitates:
- Multi-cycle path designs (high-speed clock division without clock gating)
- Standby operation of subsystems to save on power
- Hardware controlled bring-up of system components