Cyclone 10GX: Do I need 100 MHz CLK_USR input with PCI Express? - Cyclone 10GX: Do I need 100 MHz CLK_USR input with PCI Express? On a Cyclone 10GX, if a single lane of PCIe is the only transceiver I'm using, do I need a 100 MHz CLK_USR input? I imagine I probably do, but it's not 100% clear from the docs I have read. Replies: Re: Cyclone 10GX: Do I need 100 MHz CLK_USR input with PCI Express? If further support is needed in this thread, please post a response within 15 days. After 15 days, this thread will be transitioned to community support. The community users will be able to help you with your follow-up questions. Replies: Re: Cyclone 10GX: Do I need 100 MHz CLK_USR input with PCI Express? Thanks, just wanted to be sure. Replies: Re: Cyclone 10GX: Do I need 100 MHz CLK_USR input with PCI Express? Hi, This is required to connect a free running clock for the CLKUSR. else the transceiver calibration cannot be started, and it will impact the PCIe. Intel® Cyclone® 10 GX Device Family Pin Connection Guidelines Regards -SK