Phase relationship between REFCLK and SYNC_CLK

Question

Hello, 
 Is there a fixed phase relationship between the external REFCLK and the PLL generated SYNC_CLK? 
 I'm curious if I can drive the profile pins based on REFCLK vs SYNC_CLK since this clock directly drives a PLL on my FPGA. 
 Thanks, 
 Joshua

Jules.Nikko · Answer

Hi jsimmons0311 , 
 I tried to do some measurements in the lab and I can safely conclude that there is no fixed relationship in terms of phase between REFCLK and SYNC_CLK. I tried different frequencies and their giving me different phase difference. 
 All the best, 
 Jules

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Phase relationship between REFCLK and SYNC_CLK