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