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[usb] Read and writes in usb device



Hi all,
 
I have basic doubt in USB host controller. On what basis the host will send IN and OUT tokens? Assume the device has some data and wants to send to host. One way is during status read, the device can reply with interrupt status (if it is configured for interrupt mode). How to indicate the host, if it is not in this mode?
 
Waiting for reply.
 
Thanks and regards,
Veeresh