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Do I need AC coupling on the RX side (GXB_RX pins) to achieve PCIe Gen2 x4 on Arria V GX?
Not required on the Rx side.
As stated in the standards and Note 9 of Altera's Pin Connection Guideline, AC coupling is required only on the Tx side.
【reference】
https://www.altera.co.jp/content/dam/altera-www/global/ja_JP/pdfs/literature/dp/arria-v/pcg-01013.pdf
Note9) For AC-coupled links, the AC-coupling capacitor can be placed anywhere along the channel.
PCI Express protocol requires that the AC-coupling capacitor is placed on the transmitter side of the interface that permits adapters to be plugged and unplugged.
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