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PCIe AC coupling of the MCIMX6DL-SDP

Question asked by torus1000 on Feb 18, 2018
Latest reply on Feb 18, 2018 by igorpadykov



I created this thread for separating new questions from original one. igorpadykov

My questions about PCIe of MCIMX6DL-SDP are as following.
Please refer to the circuit diagram SPF-27417_C4.pdf on page 16.

According to the PCIe standard, All Transmitters shall be AC coupled.

PCIe AC coupling capacitors values p357


(Q) Why 0 ohm resister placed at C7 and C8 instead of capacitor.


I think REFCLKM/P need no capacitors but there was differntial termination and AC coupled.


(Q) Why reference clocks also AC coupled?


Can anyone help me?