RT1731
Functional Block Diagram
SCL
2
SDA
M-OTP
I C Controller
Internal Bus
Cable Policy
Engine
MUX Control
Register Block
Detection
Protocol Layer
Voltage
Regulator
USB PD Physical
Layer
VCON1
CCIN
GND
RA
RA
VCON2
Operation
40Gbps Model operation. There are several
SVID/MODE configuration setting to supports up to 3
kinds of Modal operation (40Gbps Modal Operation
included). Flexibility is retained for new applications in
the feature.
SOP’ and SOP’’ Communication
A Cable Plug capable of SOP’ Communication shall
only detect and communicate with packets starting with
SOP’. The eMarker in a Passive Cable shall be capable
of SOP’ Communication only after VCONN is on. Or
the eMarker in an Active Cable shall be capable of
SOP’ Communication only after VCONN is on and
SOP’’ Controller is not present.
PD 3.0 Compliance
The RT1731 supports PD3.0 Get_Status capability.
Customized response above will be returned. The
RT1731 also support Active Cable VDO and Active
Cable VDO2 response when product is configured as
PD3.0, Active Cable VDO version = 1.2 and act as
Active Cable.
A Cable Plug capable of SOP’’ Communication shall
have a SOP’ Communication capability in the other
Cable Plug. No cable shall only support SOP’’
Communication. A Cable Plug to which SOP’’
Communication is assigned shall only detect and
communicate with packets starting with SOP’’. The
eMarker in an Active Cable with SOP’’ Controller
present will support SOP’ communication in one Cable
Plug and SOP’’ communication in the other Cable Plug.
Proprietary Authentication
Proprietary
Authentication
is
supported
with
cooperating Device, TA, etc., that need certain
authentication before enabling proprietary charging or
customized function to ensure Cable Plug’s reliability
and quality.
The term Cable Plug in the SOP’ Communication and
SOP’’ Communication case is used to represent a
logical entity (RT1731) in the cable which is capable of
PD Communication.
Inter-Frame Gap Timings
The transmitter (Host command) shall drive the bus for
no longer than tEndDriveBMC after transmitting the final
bit of the Frame.
PD Modal Operation
The RT1731 supports PD Model operation when the
feature of Mode Enter/Exit process is specified, e.g.
Copyright © 2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS1731-01 April 2019
www.richtek.com
3
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