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TUSB2046之应用

最近我在用TUSB2046的芯片做一个USB HUB的电路,工作模式为总线供电。将设备与计算机连接后总是提示“unknow device"。想请教是什么原因?是需要安装驱动吗?可我在网上找了USB通用驱动,安装后仍然如此。请指教。谢谢。