• Grzegorz Daniluk's avatar
    spec_top: update CLOCK_DEDICATED_ROUTE constraint for refclock - we don't need it for Spartan-6 · 9b3a9e8e
    Grzegorz Daniluk authored
    This constraint is needed only when DMTD samples 125m refclock (clock has to be
    fed to D input of a flip-flop). However, in case of SPEC we use
    g_divide_input_by_2 generic in the dmtd_with_deglitcher. This re-generates
    62.5MHz clock from 125Mhz and we don't feed 125M clock directly to D input of a
    flip-flop.
    This constraint would be needed e.g. for Kintex, where refclock is 62.5MHz and
    we don't use g_divide_input_by_2.
    9b3a9e8e
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