When CLKFX is not used in my design, what is the value on the STATUS bit?
When CLKFX is not used in the design, STATUS bit of the DCM is always a "don't care".
Xilinx has observed on silicon a default value of "1" when CLKFX is unused. Xilinx does not test STATUS bit values when the CLKFX is not used and cannot guarantee this value.
Xilinx strongly recommends not using the STATUS bit in your design if the CLKFX outputs of the DCM are unused.