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Comment: Migrated to Confluence 5.3

The user can freely set voltage VREF0 through pin 37 of B2B connector JM4. VREF0 is the reference voltage for setting the input switching threshold for certain I/O standards of FPGA bank 0. For more information on reference voltages, please consult Xilinx DS610: Spartan-3A DSP FPGA Family: Complete Data Sheet.
Recommended operating voltage for VREF0 is 0.75 to 1.5 V

Warning
Absolute maximum voltage range for VREF0 is -0.5 to VCCCIO+0.5 V.