4.5 Synchronization Support
The LAN8650/1 contains several features to support system
synchronization, including time sensitive networking. These features include
- Wall Clock - derives the time from the reference clock
- Packet Timestamping - provides timestamping of packets on ingress and egress
- Event Capture - captures timestamps of events from DIO pins or selected network events
- Event Generation - generates signals synchronized to the reference clock
- Phase Adjust - enable adjustments of the wallclock smoothly and with minimal SPI cycles
The event capture, event generation and phase adjust features have a common interface that can be used for monitoring status and, where desired, triggering an interrupt to the station controller.
The reference clock for synchronization can be either the local 25 MHz clock, as described in the Clock Manager Section, or an external clock provided on pin DIOB0. The reference clock can be selected using the Reference Clock Select Bit (REFCLKSEL) of the Pad Control Register (PADCTRL).