Forum Discussion
Jodok
New Contributor
New ContributorCyclone V: reaching RGMII Data to Clock output skew of +/- 500ps
What is best practice to reach the 500ps Data to Clock output Skew of RGMII specification v2.0 on a Cyclone V? Trying synthesizing a TSE MAC with RX-Clock to TX-Clock loopback fails because of timin...
ShengN_altera
Super Contributor
Super ContributorHi,
Seems like that's the phy delay lacking which causes the violation.
Is the timing pass after adding the phy delay?
JodokNew Contributor
New ContributorDear Sheng,
No, unfortunatly the timing is still bad.
Please, where do you think is the phy-delay lacking?
I thought I considered the phy-delay in the constraints with (tPeriod/2 - tPHYDELAY) Please have a look at Cell O20;O21 in the Excel.
Greetings
