Hi
Good evening, I am a student and just start learning about USB. I am very confuse in enumeration process of USB.
I used cypress FX3S and load the USBBulkLoopAuto example firmware into the DVK board. Then i plug to the PC with USB 3.0 port. I am using USBlyzer to analyse the USB.
Here is the screenshots of the USBlyzer (website:
https://www.dropbox.com/s/b82g0zdofjcdawh/Cypress.zip), i had included some text and questions in the screenshot. Html file is the exported list.
The things make me confused is that the descriptor is send again and again (
about 3 times) in the enumeration process.
Is it the descriptor will send more detailed after assigned a driver and selected the configuration?Please follow the screenshots 1 by 1, i had included some text and questions there.
Please help me to understand the actual process of enumeration. Very thanks in advance.
Best Regards
Chong Han