Forum Discussion
JYau1
New Contributor
New ContributorHow can one generate a 100 MHz and 200 MHz clocks that is edge aligned with the 200 MHz tx_clkout output of the Altera transceiver PMA IP?
Hi folks, I have a little bit of a problem with some derived clock settings. I'm working on a project where we are using register mode data transfers to the PMA via PCS Direct. The PMA and the data ...
CheepinC_altera
Regular Contributor
Regular ContributorHi,
As I understand it, you would like to derive two different clock frequencies from the 200 MHz tx_clkout from the XCVR IP which I believe is the Native PHY. Yes, your understanding is correct, you would need an IOPLL to help derive the two clocks.
Regarding the edge aligned, would you mind to further elaborate on the observation when you use IOPLL to derive the clocks? Since they are derived from the same tx_clkout, there is no ppm concern. Is it that you are observing there are some phase shift between the two output clocks?
