HD3SS6126EVM Datasheet, PDF (2/12 Pages) TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS – HD3SS6126EVM Device Reference Design

Preliminary
User's Guide
SLAU541 – October 2013
HD3SS6126EVM Device Reference Design
This user's guide shows a USB 3.0 KVM switch application example of the HD3SS6126 device and
provides recommendations for high-speed digital signal PCB design.
1 HD3SS6126EVM Overview
1.1 Basic Function Introduction of HD3SS6126EVM
Use the HD3SS6126 evaluation module (EVM) board to select between one of two USB host systems for
an USB device and to switch between two USB hosts. Figure 1 shows the KVM switch application. The
bidirectional capability of the HD3SS6126 also supports applications that allow connections between two
target devices and one source device, such as a shared USB 3.0 host between two USB 3.0 devices.
Figure 1. KVM Switch Application of HD3SS6126EVM
USB 3.0 has additional differential TX and RX super-speed signal paths in addition to the USB 2.0 signal
path. USB 3.0 always tries to work in super-speed mode first, if the system super-speed path is connected
well. Otherwise, it works in USB 2.0 mode. The HD3SS6126EVM manually selects different USB 3.0
paths according to demand. For the HD3SS6126EVM, USB 3.0 micro-B receptacles are employed on the
host-side USB port, but a standard type-B receptacle is available, if desired. USB 3.0 standard type-A
receptacle is used as the device-side USB port. The USB ports can be attached through a standard USB
cable to any USB 3.0, or legacy USB host, hub, or device. However, a legacy USB cable forces the
system to use high-speed operation.
2
HD3SS6126EVM Device Reference Design
Copyright © 2013, Texas Instruments Incorporated
SLAU541 – October 2013
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