Cyclone V Native Phy Transceiver External PPM Detector - rx_clklow and rxfref

Hello

Just an update if anyone else stumbles across the same issue. Altera have confirmed it is an error in the transceiver guide documentation and the megawizard is correct i.e. the rx_clklow and rxfref clock outputs are not available on the Cyclone V. However a PPM detector can still be used using the transceiver reference clock input and the recovered clock, either PMA or PCS I guess (care for single or double width modes). This method will need knowledge of the Rx CDR local clock divider, for fixed serial speeds this is straight forward but for multiple serial speeds this will need to have this knowledge to adjust accordingly.

Not that I have implemented the PPM detector yet so there may be more to this issue to come.