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Intel: How should I use AC coupling/DC coupling for Cyclone® 10 GX transceiver Reference Clock (Refclk)? The evaluation board has a mix of AC-coupled and DC for REFCLK.
Category: Walkie-talkie
tool:-
Device: Cyclone® 10 GX
If the Refclk I/O Standard is LVDS or LVPECL, it will be AC coupled.
HCSL, an I/O standard used in PCI-Express, uses DC coupling.
(reference)
Intel® Cyclone® 10 GX Device Family Pin Connection Guidelines
https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/dp/cyclone-10/pcg-01022.pdf
(see REFCLK_GXB pin section)
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