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notes/USB.md
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@ -12,4 +12,12 @@ USB devices are one of the following:
# Interconnects # Interconnects
# Protocol # Protocol
A Universal Serial bus is strictly a *polled* bus, meaning the A Universal Serial bus is strictly a *polled* bus, meaning the host controller initiates every data transfer.
Most bus transactions involve the transmission of up to three packets.
1. The token packet
> Each transaction begins when the host, on a scheduled basis, sends a USB packet describing the type and direction of a transaction, the USB device address, and endpoint number.
2. The data packet
> Depending on the di
3. The handshake packet
> The destination, in general, responds to a handshake packet indicating whether the transfer was successful.