gistfile1.md

module top(
	input clk16,
	output reg spiflash_cs_n,
	output reg spiflash_clk,
	output reg spiflash_mosi,
	input spiflash_miso,
	output spiflash_wp,
	output spiflash_hold,
	input serial_rx,
	output reg serial_tx,
	inout usb_d_p,
	inout usb_d_n,
	output usb_pullup,
	output user_led0
);

SB_IO #(
	.PIN_TYPE(6'b101001),
	.PULLUP(1'd0)
) SB_IO_1 (
	.D_OUT_0(usbdevice_usb_n_tx),
	.OUTPUT_ENABLE(usbdevice_usb_tx_en),
	.PACKAGE_PIN(usb_d_n),
	.D_IN_0(usbdevice_usb_n_rx_io)
);

Info: Routing..
ERROR: No wire found for port PACKAGE_PIN on destination cell SB_IO_1.
ERROR: Routing design failed.