RT1710
Bit (s)
Bit[31:16]
Bit[15]
Field
Standard or Vendor ID (SVID)
VDM Type
Description
Unique 16 bit unsigned integer, assigned by the
USB-IF
1 = Structured VDM
Version Number of the Structured VDM (not this
specification Version) :
Version 1.0 = 0
Bit[14:13]
Bit[12:11]
Structured VDM Version
Reserved
Values 1-3 are reserved
Shall be set to 0 and shall be ignored
For the Enter Mode and Exit Mode Commands :
000b = Reserved
001b..110b = Index into the list of VDOs to
identify the desired Mode VDO
Bit[10:8]
Object Position
111b = Exit all Modes (equivalent of a power on
reset). Shall not be used with the Enter Mode
Command.
00b = Initiator
01b = Responder ACK
10b = Responder NAK
11b = Responder BUSY
Bit[7:6]
Bit[5]
Command Type
Reserved
Shall be set to 0 and shall be ignored
0 = Reserved, shall not be used
1 = Discover Identity
2 = Discover SVIDs
3 = Discover Modes
Bit[4:0]
Command (note 1)
4 = Enter Mode
5 = Exit Mode
6 = Attention
7-15 = Reserved, shall not be used
16..31 = SVID Specific Commands
Note 1 : In the case where a SID is used the modes are defined by a standard. When a VID is used the modes
are defined by the Vendor.
Discover Identity
The Discover Identity Command is provided to enable an Initiator (DFP) to identify its Port Partner and for an Initiator
(Source or DFP) to identify the attached Cable Plug (Responder).
The SVID in the Discover SVIDs Command shall be set to the PD SID by both the Initiator and the Responder for this
Command.
The Discover Identity Command sent back by the Responder contains an ID Header, a Cert Stat VDO and some Type
specific VDOs which depend on the Product Type. This specification defines the following Type specific VDOs :
Header
No. of Data Objects = 4..7
VDM
Header
ID
Header
0..3 Product
Type VDO(s)
Cert Stat VDO
Product VDO
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is a registered trademark of Richtek Technology Corporation.
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10
DS1710-00 May 2016
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
