Patent ID: 7719312

Claim:
Apparatus for configuring input/output signal levels of interfacing logic circuits operating at different voltage levels, said apparatus comprising: a logic circuit for operating on a first printed circuit board (PCB) at a first voltage level; a bank of input/output gates located on a second PCB and coupled to said logic circuit for interfacing input/output signals at a second voltage level, different from said first voltage level, to said logic circuit located on said first PCB, said bank of input/output gates including a port for setting the operational voltage level thereof; a control circuit coupled to said port and governed by a control signal to configure the operational voltage level of said bank of input/output gates to render said first voltage level of said logic circuit located on said first PCB the same as said operational voltage level of said interfacing input/output signals conducted by said bank of input/output gates located on said second PCB; a resistance network; and wherein the governing signal is settable by adjusting the resistance of said resistance network.