Stratix V Device Handbook: Volume 2: Transceivers

ID 683779
Date 11/23/2021
Document Table of Contents 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.

Figure 18. DC-Coupled Link

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.

Note: The GT channels only support AC coupling.