Are external LVDS termination resistors needed for Virtex-E or Spartan-IIE devices?
Yes. For more information on this, please see the "Detailed Functional Description" on page 45 of the Virtex-E Data Sheet:
For Spartan-IIE device termination schematics, please use the Virtex-E information as stated above. The implementation of LVDS in Spartan-IIE devices is the same as for Virtex-E devices.