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TUSB4041电脑显示未识别设备

我用TUSB4041设计了一块一带四的USB hub,上行端口暂时从四个焊点引出40cm左右的USB2.0线缆,连接到电脑上显示未识别设备,提示设备可能不能正常工作,请问正常工作的话,电脑设备管理器中会显示出什么设备呢,寄存器配置未改动过?另外,上行端线缆长度有限制吗,只要符合USB2.0规范就可以?