Can Virtex-E/-II/-II Pro/-4/-5/-6 or Spartan-IIE devices receive or transmit nondifferential (single-ended) LVPECL signals?
No. There is no support for nondifferential (single-ended) LVPECL signals.
These devices may be able to drive only non-differential LVPECL signals. However, this is not a supported flow as it is up to the designer to set and regulate the voltage levels.
These devices cannot receive nondifferential LVPECL signals, and cannot receive a nondifferential LVPECL clock on a global clock pin.