1. Explain USB transaction format(frame format)
2. Explain significance of various USB packet fields
   1. Sync
   1. PID
   1. ADDR
   1. ENDP
   1. CRC
   1. EOP
3. Explain PID significance and various PID types

• List down USB packet types
  • Token packets
    • In, out
  • Data packets
    • Data0, Data1, Data2, MData
  • Handshake packets
    • ACK: Ack that packet has been successfully received
    • NAK: Reports that the device temporary cannot send or received data. Also used during interrupt transactions to inform the host there is no data to send.
    • STALL – The device finds it’s in a state that it requires intervention from the host.
  • SOF
• Explain various aspects of USB Device
• Explain the significance of End point, buffer associated with them. How EP helps achieve improved throughput?
  • Maximum number of buffer?
  • What are the buffer configurable parameters?
• Explain significance of EP0, why is it compulsory?
• Explain Pipe concept in USB?
  • Pipe types
    • Stream pipes
      • Support Bulk, Isochronous, and interrupt
    • Message pipes
      • Support control transfers
• List down various endpoint types