LOCATE COMP "ext_clk" SITE "A9";
IOBUF PORT "ext_clk" IO_TYPE=LVCMOS33;

LOCATE COMP "ext_rst" SITE "J2";
IOBUF PORT "ext_rst" PULLMODE=UP IO_TYPE=LVCMOS33 DRIVE=4;

LOCATE COMP "uart0_txd" SITE "N17";
LOCATE COMP "uart0_rxd" SITE "M18";

IOBUF PORT "uart0_txd" IO_TYPE=LVCMOS25;
IOBUF PORT "uart0_rxd" IO_TYPE=LVCMOS25;

LOCATE COMP "led_a" SITE "V17";
LOCATE COMP "led_b" SITE "T17";
LOCATE COMP "led_c" SITE "J3";

IOBUF PORT "led_a" IO_TYPE=LVCMOS25;
IOBUF PORT "led_b" IO_TYPE=LVCMOS25;
IOBUF PORT "led_c" IO_TYPE=LVCMOS25;