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About USB memory

Honored Contributor II

Hello everyone, 

I am developping software with using Cyclone5 now. 

I have one question about USB memory. 

With USB controler in HPS and USB3300 PHY chip, I found that there are two type about USB memory. 

One is detected and the other is NOT detected. 

Linux kernel version is 3.10-ltsi. 


Please tell me how to distinguish the USB memory which isn't recognized and a recognized USB memory.
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