AHDL Function Prototype
FUNCTION ALT_IOBUF (i, oe, ) WITH (IO_STANDARD, CURRENT_STRENGTH, SLOW_SLEW_RATE, LOCATION, ENABLE_BUS_HOLD, WEAK_PULL_UP_RESISTOR, TERMINATION); RETURNS (io, o );
FUNCTION ALT_IOBUF (i, oe, ) WITH (IO_STANDARD, CURRENT_STRENGTH, SLOW_SLEW_RATE, LOCATION, ENABLE_BUS_HOLD, WEAK_PULL_UP_RESISTOR, TERMINATION); RETURNS (io, o );