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Altera_Forum
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15 years ago

PCIe polarity inversion Setting

I am using Altera PCIe x4 Soft IP 9.1 with a 2SGX60E device. As a result of the pcb layout, I have to reverse the polarity of the diffential pairs in both the receiver and the transmitter. To i...
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Altera_Forum
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15 years ago

For PCIe you should not have to worry about the polarity at all. During link initialization all PCIe devices are required to detect the polarity of the incoming signals and invert as needed. The Altera PCIe Soft IP core supports this automatically as delivered. You should not have to edit the core or the SERDES files.