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AR# 58921

Recommended GT AC coupling capacitor value for PCIe Gen 3

Description

What is the recommended AC coupling capacitor value in PCIe Gen3?

Solution

The 7 Series transceiver user guide UG476 v1.10 specifies 100 nF as the recommended value for the AC coupling capacitor on the transceiver TX/RX pins. 

However PCI Express Base Specification calls for 176 to 265 nF capacitor value for Gen3.

The values recommended in the PCI Express Base Specification can be used for Gen3. 

The value in the user guide is a generic recommendation and the user guide will be updated to reflect this for PCI Express.

AR# 58921
Date Created 12/19/2013
Last Updated 08/08/2014
Status Active
Type General Article
Devices
  • Kintex-7
  • Virtex-7