ST STM32 User Manual page 10

USB-C™ PD architecture
exit specified modes according to those supported by both provider and consumer
sides.
•
Protocol layer high (PRL layer high)
This layer's role is to construct, transmit and receive messages from/to TCPC layers
to/from the PE layer.
It interacts with the TCPM layer to transmit messages to TCPC through the TCPCi
interface.
•
Type-C™ protocol management (TCPM)
This layer must handle messages exchanged between PRL and TCPC layers. It
means the management of alerts raised by TCPC, wrap communications, and others.
•
Type-C™ protocol controller (TCPC) component
This layer is used to define all the registers accesses linked to TCPC component used
for Type-C™
•
Type-C™ protocol controller interface (TCPCi)
This layer manages all the I
interruptions linked to alerts.
•
TCPC hardware
This layer is responsible for sending and receiving messages across the CC wires.
The TCPC hardware implements the entire USB-PD PHY layer with BMC encoding.
The TCPC implements a portion of the protocol layer transmission state diagram.
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Note: For more information about the USB Power Delivery protocol, refer to the official
specification document mentioned in
10/18
CRCReceiveTimer
RetryCounter
Messages that are received are passed to the TCPM via I
BIST handling
2
C transactions between TCPM and TCPC and also
Section 1.2.
UM2063 Rev 5
UM2063
2
C