USB protocol question

Discussion in 'Computing and Networks' started by Pavlo138, Jan 18, 2010.

  1. Pavlo138

    Thread Starter Member

    Feb 26, 2009
    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!
  2. Papabravo


    Feb 24, 2006
    It is just the USB protocol and it is unique to the USB system. You can download the specifications at:

    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: