UTMI+ Low Pin Interface (ULPI) 规范的修订版1.1，英文版。 中文版地址：https://download.csdn.net/download/yalsim/12736242

USB2.0 UTMI PHY CY7C68000手册 inout模式数据口，支持8bit或者16bit，

VHDL的USB接口，来自Joris van Rantwijk，编写了完整的协议，只需要和符合UTMI接口的芯片外接构成USB。非常好，开源的，请注明GPL – GNU General Public License

USB2.0 utmi接口协议 USB2.0硬件开发

USB3300的vrilog版本的驱动代码，搬运自外网opencores. This file is open source HDL; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This file is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

英特尔公司颁布的usb2.0 utmi协议。实现的是usb 2.0 中底层协议，可以参考usb 2.0协议第七章进行研究。

UTMI +低引脚接口（ULPI）规范V1.1(中文版)； 本人通过机翻后逐页校正，重新排版，添加目录。 该中文版翻译完成度较高。 英文原版地址：https://download.csdn.net/download/yalsim/12736019

ULPI (UTMI+ Low Pin Interface) 规范

The purpose of this document is to specify an interface to which USB 2.0 ASIC, ASSP, discrete PHY, system peripherals and IP vendors can develop USB2.0 products.