Legend : NC = Not Connected, unbonded pin PE = Port Enable pin WPU = Unused with Internal Weak Pull Up TIE = Unused I/O floating -- must tie to VCC, GND or other signal VCC = Dedicated Power Pin GND = Dedicated Ground Pin TDI = Test Data In, JTAG pin TDO = Test Data Out, JTAG pin TCK = Test Clock, JTAG pin TMS = Test Mode Select, JTAG pin PROHIBITED = User reserved pin