Configure USB1 interrupt in Omap L-138

Hi all,
I'm using OMAP L-138 and want to use USB1.1, I pick usb_dev_bulk to modify on it to match my application needs.
In usb_dev_bulk.c:

static void ConfigureDSPINTCIntUSB (void)
{
    IntRegister(4, USB0DeviceIntHandler);
    IntEventMap(4, SYS_INT_USB0);
    IntEnable(4);
}

If this code configures the USB2.0, what to make to on it to let it configure USB1.1 instead of USB2.0 ??
Urgent help please. Regards.
Muhammad