39.6.3.9 Management of Control Pipes

A control transaction is composed of three stages:

  • SETUP
  • Data (IN or OUT)
  • Status (IN or OUT)

The user has to change the pipe token according to each stage using the Pipe Token field in PCFG (PCFG.PTOKEN).

For control pipes only, the token is assigned a specific initial data toggle sequence:

  • SETUP: Data0
  • IN: Data1
  • OUT: Data1