Signal transmission method for USB interface and apparatus thereof

摘要

A signal transmission method for a USB interface and an apparatus thereof are provided. The method includes: receiving a first USB signal sent from a sending terminal, processing the first USB signal into a USB-like signal, and transmitting the USB-like signal via a networking cable; receiving the USB-like signal, processing the USB-like signal into a second USB signal, and sending the second USB signal to a receiving terminal. According to the embodiments of the present invention, the first USB signal is processed into a USB-like signal which is similar to the USB signal, the USB-like signal is transmitted via a networking cable, and the USB-like signal is processed into a second USB signal. The transmission process does not require converting the USB signal into a networking-cable signal which is to be transmitted via a networking cable, thereby avoiding conversion between protocols, and simplifying the entire transmission process.

主权项

1. A signal transmission method for a USB interface, comprising:
receiving a first USB signal sent from a sending terminal, obtaining a squelch signal according to the first USB signal, processing the first USB signal into a USB-like signal, and transmitting the USB-like signal via a networking cable; and receiving the USB-like signal, processing the USB-like signal into a second USB signal, and sending the second USB signal to a receiving terminal, wherein the USB-like signal is a pair of differential signals that meets a USB transmission protocol, does not meet USB signal electrical specifications, and has a signal swing different from those of the first USB signal and the second USB signal, wherein the processing the first USB signal into a USB-like signal comprises:
abstracting a first clock according to a data edge of the first USB signal;sampling the first USB signal and the squelch signal according to the first clock to obtain a processed first USB signal and a processed squelch signal, and sending the processed first USB signal and the processed squelch signal;receiving the processed first USB signal and the processed squelch signal, and sending the processed first USB signal and the processed squelch signal to a first-in first-out (FIFO) unit by using the first clock;receiving a second clock sent from a phase-locked loop (PLL), the second clock having a frequency different from that of the first clock;reading the processed first USB signal and the processed squelch signal from the FIFO unit by using the second clock;sending the processed first USB signal and the processed squelch signal read from the FIFO unit; andreceiving the processed first USB signal and the processed squelch signal read from the FIFO unit, and processing the processed first USB signal and the processed squelch signal read from the FIFO unit into the USB-like signal.