18.104.22.168. Link Coupling
A high-speed serial link can be AC-coupled or DC-coupled, depending on the serial protocol you are implementing.
In a DC-coupled link, the transmitter VCM is seen unblocked at the receiver buffer. The link VCM depends on the transmitter VCM and the receiver VCM. The on-chip or off-chip receiver termination and biasing circuitry must ensure compatibility between the transmitter and receiver VCM.
You can DC-couple a GX/GS channel transmitter to a GX/GS channel receiver for the entire data rate range from 600 Mbps to 14.1 Gbps.
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