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LLC_DLL mux phase shift on adv7842

Question asked by mbu on Nov 10, 2014
Latest reply on Nov 10, 2014 by GuenterL



We have a design with adv7842 where we had to adjust the phase of the LLC clock to adapt to the back-end fpga.


Ie.enabled LLC_DLL_MUX and LLC_DLL_EN and setting phase in LLC_DLL_PHASE.


This works and we can adjust the phase.

However, looking more closely at this we have found that phase-shift seems to depend on the LLC frequency.


Our LLC frequency range form 25MHz to 154MHz.


We would expect that the phase shift was constant with regards to the data/sync.


There have been some posts on this before, for instance:


But could you shed some light over phase-shift versus frequency on the LLC_DLL mux ?