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USB host disconnect automatically

RDals.1
Associate

Hi,

We are designed board using STM32F207 for USB host. I have 2 keyboard. one keyboard work perfectly & other keyboard also work but after few second automatically disconnect from host & connect it again. Same keyboard work perfectly with STM32F407Discovery board.

0693W000004JLMgQAO.png 

any one can help on us, how to solve this problem?

Thanks

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