IO Standard for GTS Transceiver REFCLK - IO Standard for GTS Transceiver REFCLK Hi, We use on the Agilex 5 and 3 Transceivers with AC coupling. Agilex 5 requires CML, HCSL in Agilex 5 datasheet. However, Agilex 5 Premium kit uses LVDS Clock for some Transceiver REFCLK. Is it possible to use LVDS as REFCLK for XCVRs when we use with AC Coupling ? Replies: Re: IO Standard for GTS Transceiver REFCLK Yes — LVDS can be used as a REFCLK for Agilex 5 (and Agilex 3) transceivers if it is AC‑coupled and its common‑mode voltage/swing are translated into the allowed CML/HCSL input range.