ST STM32G471 User Manual

USB Type-C™ / USB Power Delivery interface (UCPD) RM0440
2050/2126 RM0440 Rev 4
Packet format
Messages other than Hard Reset and Cable Reset
The packet format is shown in the following figure, with information on 4b5b encode and
data source.
Figure 677. Packet format
Hard Reset
The physical layer handles the Hard Reset signaling differently than the other types of
message as it has higher priority to be able to interrupt an on-going transfer.
The physical layer specification implies the following sequence in the case of an ongoing Tx
message:
1. Terminate the message by sending an EOP K-code and discard the rest of the
message.
2. Wait for tInterFrameGap time.
3. If the CC line is not idle, wait until it goes idle.
4. Send the preamble followed by the four K-codes of Hard Reset signaling.
5. Disable the CC channel (stop sending and receiving), reset the physical layer and
inform the protocol layer that the physical layer is reset.
6. Re-enable the channel when requested by the protocol layer.
Figure 678. Line format of Hard Reset
MSv45539V2
Preamble
(training for receiver)
SOP*
(start of packet)
Legend:
CRC
EOP
(end of packet)
...
Header Byte 0 ...
Provided by the physical layer, not 4b5b-encoded
Provided by the physical layer, 4b5b-encoded
Provided by the protocol layer, 4b5b-encoded
Byte 1
Byte n-1 Byte n
MSv45540V2
Preamble
(training for receiver)
RST-1
Legend:
Provided by the physical layer, not 4b5b-encoded
Provided by the physical layer, 4b5b-encoded
Hard Reset ordered set
RST-1 RST-1 RST-2

ST STM32G471 Specifications

General

Brand	ST
Model	STM32G471
Category	Microcontrollers
Language	English