UNIVERSAL SERIAL BUS (USB) SYSTEM WITH SINGLE PORT AND HOST CONTROLLER THEREOF

摘要

A universal serial bus (USB) with single port and a host controller thereof are provided. The USB comprises a USB port, a speed detection circuitry, a start of frame (SOF) generator, and a host controller. The USB port is electrically coupled to an external circuitry. The speed detection circuitry is electrically coupled to the USB port for detecting a transmission speed between the USB and the external circuitry via the USB port to provide a detecting result. The SOF generator is electrically coupled to the speed detection circuitry for receiving the detecting result and outputting a SOF signal, to determine a cycle of the SOF signal based on the detecting result. The host controller is electrically coupled to the SOF generator and the speed detection circuitry for adjusting the host controller based on SOF signal cycle to comply with the USB 2.0, USB 1.1 and USB 1.0 transmission standards.