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AM1808: AM1808 usb2.0 USB2.0 PHY reference clock input frequencies 48MHz

Part Number: AM1808

你好请问AM1808 usb2.0  PHY reference clock input frequencies  配置成24MHz usb2.0可以正常工作,但是配置成48MHz导致usb2.0无法正常工作是什么原因?由于我们的usb1.1需要usb2.0提供48MHz时钟源