WARNING:PhysDesignRules:367 - The signal <BTN0_IBUF> is incomplete. The signal
   does not drive any load pins in the design.
WARNING:PhysDesignRules:367 - The signal <BTN1_IBUF> is incomplete. The signal
   does not drive any load pins in the design.
WARNING:PhysDesignRules:367 - The signal <BTN3_IBUF> is incomplete. The signal
   does not drive any load pins in the design.
INFO:PhysDesignRules:772 - To achieve optimal frequency synthesis performance
   with the CLKFX and CLKFX180 outputs of the DCM comp DCM_SP_inst/DCM_SP_inst,
   consult the device Interactive Data Sheet.
WARNING:PhysDesignRules:549 - Unexpected DCM programming. For DCM comp
   DCM_SP_inst/DCM_SP_inst, when the CLKFX or CLKFX180 pins are used the
   CLKIN_PERIOD attribute must be specified in order to achieve optimal
   performance.
DRC detected 0 errors and 4 warnings.