Freescale-semiconductor TWR-MCF52259-Ethenet Manual do Utilizador Página 110

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TM
Software – General Concepts
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Frames in More Detail
Each frame begins with a Start of
Frame packet followed by the
hosts transactions to device
endpoints for data transfer.
The host may schedule
transactions anywhere in the
frame, but they must complete
within the frame.
The host schedules
transactions within 1mS
frames for low and full
speed.
Token Data Handshake
Transfers may span
multiple frames.
Control, Interrupt,
Bulk,
Isochronous
Unused
1 Ms Frame
Transfer 1
Transaction
Start of Frame
Transfer 2
Transaction 1
Packet 1
Packet 2
Packet 3
Transaction 2
Packet 1
Packet 2
Packet 3
Transaction 3
Packet 1
Packet 2
Packet 3
Transfer N
Transaction 1
Packet 1
Packet 2
Packet 3
Unused
Transfer 1
Transaction
Start of Frame
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