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M30245 Group
Transaction
A transaction is the unit in which the host CPU schedules one frame. Each transaction is config-
ured with packet, and the transaction types are determined according to the configuration pat-
tern. The transaction types and formats are shown below:
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Isochronous transaction (IN)
(idle state)
Figure 2.8.3. Formats of transactions
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
IN transaction
(idle state)
IN
DATA0/1 NAK STALL
ACK
(idle state)
IN
DATA0
(idle state)
Token packet issued by the host
Handshake packet issued by the host
Data packet issued by the host
Data packet issued by the device
Handshake packet issued by the device
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OUT transaction
(idle state)
OUT
DATA0/1
ACK NAK STALL
(idle state)
Isochronous transaction (OUT)
(idle state)
OUT
DATA0
(idle state)
2. USB function
SETUP transaction
(idle state)
SETUP
DATA0
ACK
(idle state)
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