NEC switch User Manual page 135

(6) Interrupt transfer
Packet flow
Packet from
Packet from
µ
host controller
IN
IN
DATA1
ACK
IN
IN
DATA0
ACK
IN
CHAPTER 8
Operation of host
PD789800
controller
NAK
NAK
NAK
User's Manual U12978EJ3V0UD
USB FUNCTION
IN packet
IN packet
IN packet
IN packet
Operation of USB
µ
function of PD789800
ACK transmission
reservation
• NAK transmission
• DATA1 transmission
reservation
• DATA1 transmission
• NAK transmission
reservation
NAK transmission
reservation clear
• NAK transmission
• DATA0 transmission
reservation
• DATA0 transmission
• NAK transmission
reservation
• NAK transmission
• NAK transmission
reservation
135