HIGH DENSITY, LOW JITTER, SYNCHRONOUS USB EXPANSION

摘要

A method of providing a synchronisation channel to a SuperSpeed USB device, comprising: establishing a SuperSpeed communication channel connection to the SuperSpeed USB device with a USB cable that has USB 2.0 D+ and D- data signalling lines disabled or disconnected at an upstream connection point; multiplexing synchronization information onto the D+/D- data signalling lines at the upstream connection point; and demultiplexing the synchronization information from the D+/D- signalling lines at a downstream connection point of the cable; whereby the synchronisation channel is maintained across the D+/D- data signalling lines.