Anyone up for a USB question?
I know that USB uses NRZI encoding for data, Tx and Rx, but is there a framing scheme or particular protocol that USB uses beyond just the encoded data? And would anybody happen to know what that protocol is called? Thanks!

 

Anyone up for a USB question?
I know that USB uses NRZI encoding for data, Tx and Rx, but is there a framing scheme or particular protocol that USB uses beyond just the encoded data? And would anybody happen to know what that protocol is called? Thanks!

It is just the USB protocol and it is unique to the USB system. You can download the specifications at:

www.usb.org

It's free, but be prepared to dring from the firehose. Jan Axelson wrote several boooks on inplementing USB which you might find helpful in your reaserch. Here is one of them:

http://www.amazon.com/USB-Complete-Everything-Develop-Peripherals/dp/0965081958