NEC switch - Manual (Page 134)

CHAPTER 8 USB FUNCTION
User’s Manual U12978EJ3V0UD
134
(5) No data control
Request
Operation of host
controller
IN packet
SETUP
DATA0
ACK
Packet from
host controller
Packet from
PD789800
Setup
stage
Status
stage
No data
control
IN
DATA1
• ACK transmission
• DATA1 transmission
reservation
Operation of USB
function of PD789800
ACK transmission
reservation
DATA1 transmission
Packet flow
ACK
ACK packet
NAK transmission
reservation
µ
µ