USB PD R3.0 V2.0 ECN - tEnterUSB Clarification
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2020-11-22
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USB Power Delivery ENGINEERING CHANGE NOTICE
USB Power Delivery
ECR Form 20190930
Page: 1
Title: tEnterUSB Clarification
Applied to: USB Power Delivery Specification Revision 3.0
Version 2.0
Brief description of the functional changes proposed:
Clarifies the starting point for the time tEnterUSB so that it aligns with the USB Type-C specification for the start of
tUSB4Timeout, which states that it starts at 1) “Sink attach” or 2) “data connection is reestablished” during Data Reset
process.
1) PD Connection is the point where the source and the sink are attached.
2) The Data_Reset_Complete message signifies that the data connection has been reestablished following a Data
Reset.
This ECN clarifies that a DFP is required to send Enter_USB within tEnterUSB following a DR_Swap.
Sinks are recommended not to initiate any Atomic Message Sequence until the DFP has had time to send the
EnterUSB message.
Benefits as a result of the proposed changes:
This ECN clarifies the tEnterUSB requirement.
An assessment of the impact to the existing revision and systems that currently conform to
the USB specification:
No impact.
An analysis of the hardware implications:
None
An analysis of the software implications:
None
An analysis of the compliance testing implications:
Clarifies the starting point of the tEnterUSB timer. Compliance tests need to take this into account.
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