[SOLVED] Explanation of USB transaction flow

[zel]

Hi guys
I just want to know.
I've read the USB3.0 spec, but i still dont understand.
what will happen 1st after we connect a host to a device using usb.
in terms of packet transaction..
please help me to understand the transaction flow..

Thanks

:?::?::?::?::?::?:

 

[vipinlal]

USB Transaction

I found this while googling... i hope this is a nice tutorial..
https://www.beyondlogic.org/usbnutshell/usb1.htm

--vipin
https://vhdlguru.blogspot.com/

 

[zel]

Re: USB Transaction

the site is helpfully..
but the spec explained in the site is USB2.0..
or maybe it has similar transaction like USB3.0..i dont know, still searching for it..if anybody can explained it clearly to me, i really appreciate it..

 

[varkylin]

USB Transaction

After we connect the device to the host controller, the host will do Receiver detection, then do Polling and enter into U0 state. In U0 state, it will do header sequence number advertisement and Rx heaser buffer credit advertisement, then both host and device exchange port capability LMP and do port configuration. Then we can transmit any packet as USB2.0 does. When no packer is to be transmitted, it can enter into U1/U2/U3 state to save power. This is the basic sequence of USB3.0.

 

[mrflibble]

Re: USB Transaction

Snoop the usb 3.0 transaction using wireshark to capture the usb traffic and let us know what you found.

 

[zel]

Re: USB Transaction

wow..thanks varkylin, your explanation help me a lot..
mrflibble, i really dont know that we can capture it?
its awesome..problem solved!