apparatus for configuring input / output signal levels of interfacing logic circuits operating at different voltage levels comprises : a logic circuit for operating at a first voltage level ; a bank of input / output gates coupled to the logic circuit for interfacing input / output signals at a second voltage level , different from the first voltage level , to the logic circuit , the bank of gates including a port for setting the operational voltage level thereof ; and a control circuit coupled to the port and governed by a control signal to configure the operational voltage level of the bank of gates to render the logic circuit and the interfacing input / output signals voltage level compatible .