Three Families — LX/SX/FX-Virtex-4 LX: High-performance logic applications solution-Virtex-4 SX: High-performance solution for digital signalprocessing (DSP) applications-Virtex-4 FX: High-performance, full-featured solution forembedded platform applicationsXesium Clock Technology-Digital clock manager (DCM) blocks-Additional phase-matched clock dividers (PMCD)