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TUSB8041 输出USB兼容问题

Other Parts Discussed in Thread: TUSB8041

Hi, TI 专家

 TUSB8041是一个四端口USB3.0 hub控制器,但根据原理USB3.0需要向下支持USB2.0设备;

当我将USB3.0插入输入接口;四个输出接口兼容性均良好-USB3.0/2.0/1.1皆可以支持,如下图1所示:

但我将输入改为USB2.0时;输出接口插入USB3.0(以USB3.0U盘为例)设备时会出现无法识别设备的情况,但理论上USB3.0的设备将自动降级为2.0才对,如下图2所示:

这个问题是否可以通过电路调整使其解决?

特付相关部分原理图见附件

                         图一

                                 图二

USB8041_demo.doc