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Altera_Forum's avatar
Altera_Forum
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9 years ago

numbers of lanes QSYS Cyclone V hard IP for PCI Express

Hi guys I need your helping please. I'm using Qsys and I've selected a PCIe interface. When I customized amount lanes I've selected x1 lanes, but when I watched the interface I've noticed tha...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

PCIe is bidirectional and full duplex. Each lane consists of two separate diff pairs - one Rx and one Tx. What exactly are you asking? The JPEG you attached is too small to see, so can't comment on your Qsys setup.

If you're asking why only one Rx and one Tx interface is shown when each consists of a diff pair, think logical vs. physical here. Qsys is not going to show you the + and - wires of each pair, but they are there.