Mechanism of USB2.0 Hub Transaction Translator
Zhao Qiu · 2003
Universal Serial Bus(USB) is a new generation of the standard peripheral interface bus. Different from USB 1.0, USB2.0 adds a third transfer rate of 480Mbps to the 12Mbps and 1.5Mbps originally defined for USB. USB2.0 provides a mechanism that supports full-/low speed devices connected the hub, while transmitting all device data between the host controller and the hub at high-speed. The mechanism minimizes the impact that full /low speed devices have upon the bandwidth available for high speed devices.