Cyclone III FPGA development kit USB communication

We have used SLS USB 2.0 IP Core to have a USB communication between the Cyclone III kit and PC. But we did not use the USB port on the board, but additional boards with the PHY. The set up looks like in the picture http://www.slscorp.com/images/ref_design/setup/onbrd_device_b.jpg and http://www.slscorp.com/images/ref_design/setup/h3sum_utmi_a.jpg