[SI-LIST] [SI-LIST]: PCIe2 Rx Eye Spec inside Pad

  • From: vinod ah <ah.vinod@xxxxxxxxx>
  • To: SI-LIST <si-list@xxxxxxxxxxxxx>
  • Date: Tue, 19 May 2015 15:23:03 +0530

Hi All,
I was trying to measure BER contour (Eye) inside PCIe2 Rx after CTLE-CDR,
not on RX pins.

I see that i am getting eye height of 250mV & eye width of 64ps inside the
Rx pad using internal eye measurement circuit.

I was going through PCIe2 spec, i see that spec defines 120mV & 0.4 UI i.e.
80ps at Rx pins, but not inside Rx after CTLE, CDR.

I am unable to run Jitter tolerance test on PCIe2 Rx as Root complex and
End point are on the same board soldered down (not motherboard-Add-in card).

PCIe3 CEM spec defines 46mV & 41ps after DFE. Is there similar spec for
PCIe2 Rx.

Regards
Vinod A H


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