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The packets shown in Figure 4.9-3 are combined to form a frame for transferring over the USB.
Each packet will be explained.
All packets begin with a SYNC field. This is an 8-bit field used to synchronize the input data and
local clock on the input circuit. The SYNC field is used only for synchronizing. The frame starting
packet contains an SOF (Start of Frame) field after the SYNC field.
SOF is a type of PID (Packet ID), but used only for the frame starting packet. The Frame
Number field is for counting the number of frames.
The CRC (Cyclic Redundancy Check) field is used to detect transmission errors.
An EOP (End of Packet) is sent at the end of each packet.
In the token packet, the PID is followed by a 7-bit address and 4-bit endpoint number, plus a
5-bit CRC for detecting transmission errors.
In the data packet, the PID is followed by a 16-bit CRC for detecting transmission errors.
The side that receives the data sends a handshake packet.
Figure 4.9-3 USB packet format
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