The RocketIO GTP Wizard is used to generate the correct settings and some interconnect based on what is selected by the user in the Wizard GUI. Many settings are in a default state when the Wizard is first opened, with the expectation that the user will define them as needed by the end system. One such setting that needs to be changed by the user is the Termination Voltage setting on page 5.
According to the Virtex-5 RocketIO GTP User's Guide (UG196), if the internal AC Coupling capacitor is disabled, then the termination voltage needs to be set to 2/3VTTRX. This recommendation is mentioned in the note for the Termination Voltage portion of the Wizard, and should be selected if the internal AC coupling capacitor is bypassed.