3.2.4 AC/DC Coupled Connection

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DC coupled connection option is set for using AC or DC coupled channels to the receiver. The device does include an internal coupling capacitor option, however, it also includes internal biasing circuitry required for AC coupled applications.

AC coupled with external cap. VICM is internally generated.
DC coupled – Link partner is in control of the Vcim through the incoming signal.

Note: For AC coupled with external cap, user must still place ac-coupling capacitor on PCB for AC coupled connection.

AC-coupling or DC-coupling is configured through the XCVR Signal Integrity options, which is available in Libero SoC v12.2 and later. Coupling options can be set in the Signal Integrity View tab (open the I/O Editor > XCVR View).