NEC switch User Manual page 131

(2) Control transfer (OUT) (Transfer byte count: 9 bytes or more)
Packet from
host controller
SETUP
Setup
stage
DATA0
OUT
Data
stage OUT
reception
DATA1
OUT
DATA0
OUT
DATA1
OUT
DATA1/0
Status stage
IN
IN reception
ACK
CHAPTER 8
Packet flow
Packet from
µ
PD789800
ACK
ACK
ACK
ACK
ACK
DATA1
User's Manual U12978EJ3V0UD
USB FUNCTION
Operation of
host controller
Request
OUT packet
OUT packet
OUT packet
OUT packet
IN packet
ACK packet
Operation of USB
µ
function of PD789800
ACK transmission
reservation
• ACK transmission
• NAK transmission
reservation
• NAK transmission
reservation clear
• ACK transmission
reservation
• ACK transmission
• NAK transmission
reservation
• NAK transmission
reservation clear
• ACK transmission
reservation
• ACK transmission
• NAK transmission
reservation
• NAK transmission
reservation clear
• ACK transmission
reservation
• ACK transmission
• NAK transmission
reservation
• NAK transmission
reservation clear
• ACK transmission
reservation
• ACK transmission
• DATA1 transmission
reservation
DATA1 transmission
NAK transmission
reservation
131