If CLOCKING_MODE = DUAL CLOCK is selected, then the two clocks:
LOOKUP_INTERFACE_FREQ and RAM_FREQ should be
sourced/derived from the same clock generator (MMCM or PLL).
If CLOCKING_MODE = DUAL CLOCK is selected, then the two clocks:
LOOKUP_INTERFACE_FREQ and RAM_FREQ should be
sourced/derived from the same clock generator (MMCM or PLL).