Concepts
The General USB Process | ||||
How Data is Transferred in USB | ||||
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| Transaction |
| Transaction |
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General
Packet 1
Packet 2
Packet 3
Packet 1
Packet 2
Packet 3
TM
Software –
For each transaction there are three types of packets that communicate the data between host and device:
1.Token Packet – the header that defines what follows
2.Optional Data Packet – contains the data being transmitted
3.Status/Handshake Packet – used to acknowledge transactions and provide a means of error correction
