8M Mini PCIe Clock Generation Termination

[adevries]

Hello,

If I want to use the 8M Mini to generate my PCIe clock signal, does that signal need any external terminating resistors? Or does it have internal 50 ohm terminations?

Thanks

[igorpadykov · Accepted solution]

Hi adevries

corrected:

it is configurable using bit 3 register CMN_REG064
described in sect.11.4.3.1.102 (CMN_REG064)

i.MX 8M Mini Applications Processor Reference Manual

Best regards
igor
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[marcelziswiler]

I really don't think this is true. We added external termination but now the amplitude of the clock is way too low. Removing those external 50 ohm termination resistors again improves the situation but it looks like further tweaking of undocumented registers from the DWC IP is required. Could you please reveal details about how/what exactly one may set to increase the clock swing? Thanks!