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
(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?