Interconnectivity Page 10 of 22 Firmware Programming guide for PDIUSBD12 5.2 Control Endpoint Handler Control Write DLE RECEIVE Control transfer always begins with the SETUP stage and then followed later by an optional DATA stage. It then ends with the status stage. the diagram below shows the various states of transitions on the Control endpoints. The firmware uses these 3 states to handle Control transfer correctly Visithttp://www.flerInterconnectivity Page 10 of 22 Firmware Programming Guide for PDIUSBD12 Philips Semiconductors - Asia Product Innovation Centre Visit http://www.flexiusb.com 5.2 Control Endpoint Handler Control transfer always begins with the SETUP stage and then followed later by an optional DATA stage. It then ends with the STATUS stage. The diagram below shows the various states of transitions on the Control endpoints. The firmware uses these 3 states to handle Control transfer correctly. TRANSMIT IDLE RECEIVE No-data Control return Status Control Write Status Control Read Status INs OUTs