PCIe differential REFCLK connection from M.2 connector to an Agilex 5 device

Question

We will make a M.2-card with an Agilex 5 device and connect the M.2-card trough PCIe with the host (laptop).

Is it possible to connect the REFCLKp and REFCLKn pins from a M.2 connector directly (DC coupling without any devices like capacitors) to the REFCLK_GTS1x_RXp and REFCLK_GTS1x_RXn pins of the GTS transceiver?

fvm · Answer

According to datasheet, dc coupled CML input standard is supported.

rongy_altera · Answer

Hi,Please follow the guideline to do this.https://www.intel.com/content/www/us/en/docs/programmable/813266/current/gts-transceiver-pins-42864.htmlThe intention to reduce the PCB size is understandable for such design. You may check more different clock components, either low power or ultra small size for example.Regards,Rong

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PCIe differential REFCLK connection from M.2 connector to an Agilex 5 device

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