RT1710S
Application Information
Start of Packet Sequence Prime (SOP’)
The SOP’ ordered set is defined as: two Sync-1
K-codes followed by two Sync-3 K-codes
K-code number
1
2
3
4
K-code in code table
Sync-1
Sync-1
Sync-3
Sync-3
Setting the VDM Type field to 1 (Structured VDM)
defines the use of bits Bit[14:0] in the Structured VDM
Header. The fields in the Structured VDM Header are
defined in Table.
The following rules apply to the use of Structured VDM
messages:
Structured VDMs shall only be used when an
Explicit Contract is in place with the following
exception :
Prior to establishing an Explicit Contract a Source
may issue Discover Identity messages, to a Cable
Plug using SOP’ Packets, as an Initiator.
Only the DFP shall be an Initiator of Structured
VDMs except for the Attention Command that shall
only be initiated by the UFP.
Only the UFP or a Cable Plug shall be a Responder
to Structured VDMs.
Structured VDMs shall not be initiated or responded
to under any other circumstances.
A DFP or UFP which does not support Structured
VDMs shall ignore any Structured VDMs received.
A Command sequence shall be interruptible e.g.
due to the need for a message sequence using SOP
Packets.
A Cable Plug capable of SOP’ Communications shall
only detect and communicate with packets starting with
SOP’.
A DFP or Source needing to communicate with a Cable
Plug capable of SOP’ Communications, attached
between a Port Pair will be able to communicate using
both packets starting with SOP’ to communicate with
the Cable Plug and starting with SOP to communicate
with its Port Partner. The DFP or Source shall
co-ordinate SOP and SOP’ Communication so as to
avoid collisions.
Structured VDM
Bit(s)
Bit[31:16]
Bit[15]
Field
Description
Standard or Vendor ID (SVID) Unique 16 bit unsigned integer, assigned by the USB-IF
VDM Type
1 = Structured VDM
Version Number of the Structured VDM (not this specification
Version):
Version 1.0 = 0
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
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
Shall be set to 0 and shall be ignored
is a registered trademark of Richtek Technology Corporation.
Bit[14:13]
Structured VDM Version
Bit[12:11]
Reserved
Bit[10:8]
Object Position
Bit[7:6]
Bit[5]
Command Type
Reserved
Copyright © 2017 Richtek Technology Corporation. All rights reserved.
www.richtek.com
8
DS1710S-00
February 2017
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
