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USB transmissions are managed by dividing time into frames that repeat every 1 ms, and
allocating small portions of this transmission time to each device within each frame. The host
starts a frame by sending the SOF packet every 1 ms. This is followed by a token packet sent
from the host, which informs the device of the transfer type, device address, and end point.
Devices may respond to the data and handshake packet only if they have been addressed.
The ACK packet is issued when the data transfer completes, while the NAK packet is issued
when no endpoints are available (requesting the host to resend). STALL is issued when the
endpoint cannot be used.
Figure 4.9-2 Frames
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