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Confidential

Specification for

Unified Protocol

(UniPro

)

Version 2.0 – 19 February 2022

MIPI Board Adopted 15-June-2022

* CAUTION TO IMPLEMENTERS *

This document is a MIPI Specification. MIPI member companies’ rights and obligations apply to this MIPI Specification

as defined in the MIPI Membership Agreement and MIPI Bylaws.

The UniPro v2.0 Specification is a feature update succeeding the UniPro v1.8 Specification.

The UniPro v2.0 Specification references the following documents:

• Specification for M-PHY®, Version 5.0

• Specification for Device Descriptor Block (DDB), Version 1.0

Backwards Compatibility

The UniPro v2.0 Specification was designed to ensure interoperability with UniPro v1.8. A few features defined in

earlier versions of UniPro have been obsoleted in UniPro v2.0, mainly because they proved to be less useful or

outdated. With the removal of features, the statement of interoperability relates only to those features that are

common to UniPro v2.0 and predecessor versions. Backward compatibility to UniPro versions v1.61 and earlier is not

maintained.

Changes

• Added protocol support for HS-G5 transmission in M-PHY

• Added optional protocol support for increased payload length in data frames. Ensures overhead reduction

due to protocol layer header at higher bandwidth.

• Deprecated the MK2 Extension feature

• Deprecation of PWM-G2 to PWM-G7 is mentioned to align with M-PHY v5.0

• Implemented deprecation path for Dummy Burst.

• Improve FastAuto_Mode with programmable burst closure delay

Known Issues

• No known issues.

NOTE: LICENSING OBJECTION RECEIVED

Implementers should be aware that a licensing objection was received from Intel in regard to version 0.80.00 of this

Specification, MIPI Alliance Standard for Unified Protocol (UniPro), Version 0.80.00, dated 6 September 2006 and

adopted by the MIPI Board of Directors on 26 February 2007 (UniPro v0.80.00). The UniPro v0.80.00 Specification is

available at https://members.mipi.org/wg/UniPro/document/51407. Intel's licensing objection is available at

https://members.mipi.org/wg/All-Members/document/9315.

Licensing objections are defined in Article X, Section 1 of the MIPI Bylaws. Member companies considering

implementation or use of this standard are strongly encouraged to review this information.

UniPro v0.90.00 was drafted by the MIPI UniPro Working Group taking into account the Licensing Objection of Intel

with respect to UniPro v0.80.00. UniPro v0.90.00 was renumbered to v1.00.00 upon approval by the MIPI Board as a

MIPI Specification. The UniPro v1.00.00 Specification is available at

https://members.mipi.org/wg/UniPro/document/51463.

Specification for UniPro Version 2.0

19-Feb-2022

Confidential

NOTICE OF DISCLAIMER

The material contained herein is provided on an “AS IS” basis. To the maximum extent permitted by

applicable law, this material is provided AS IS AND WITH ALL FAULTS, and the authors and developers

of this material and MIPI Alliance Inc. (“MIPI”) hereby disclaim all other warranties and conditions, either

express, implied or statutory, including, but not limited to, any (if any) implied warranties, duties or

conditions of merchantability, of fitness for a particular purpose, of accuracy or completeness of responses,

of results, of workmanlike effort, of lack of viruses, and of lack of negligence. ALSO, THERE IS NO

WARRANTY OR CONDITION OF TITLE, QUIET ENJOYMENT, QUIET POSSESSION,

CORRESPONDENCE TO DESCRIPTION OR NON-INFRINGEMENT WITH REGARD TO THIS

MATERIAL.

IN NO EVENT WILL ANY AUTHOR OR DEVELOPER OF THIS MATERIAL OR MIPI BE LIABLE TO

ANY OTHER PARTY FOR THE COST OF PROCURING SUBSTITUTE GOODS OR SERVICES, LOST

PROFITS, LOSS OF USE, LOSS OF DATA, OR ANY INCIDENTAL, CONSEQUENTIAL, DIRECT,

INDIRECT, OR SPECIAL DAMAGES WHETHER UNDER CONTRACT, TORT, WARRANTY, OR

OTHERWISE, ARISING IN ANY WAY OUT OF THIS OR ANY OTHER AGREEMENT RELATING TO

THIS MATERIAL, WHETHER OR NOT SUCH PARTY HAD ADVANCE NOTICE OF THE

POSSIBILITY OF SUCH DAMAGES.

The material contained herein is not a license, either expressly or impliedly, to any IPR owned or controlled

by any of the authors or developers of this material or MIPI. Any license to use this material is granted

separately from this document. This material is protected by copyright laws, and may not be reproduced,

republished, distributed, transmitted, displayed, broadcast or otherwise exploited in any manner without the

express prior written permission of MIPI Alliance. MIPI, MIPI Alliance and the dotted rainbow arch and all

related trademarks, service marks, tradenames, and other intellectual property are the exclusive property of

MIPI Alliance Inc. and cannot be used without its express prior written permission. The use or

implementation of this material may involve or require the use of intellectual property rights (“IPR”)

including (but not limited to) patents, patent applications, or copyrights owned by one or more parties,

whether or not members of MIPI. MIPI does not make any search or investigation for IPR, nor does MIPI

require or request the disclosure of any IPR or claims of IPR as respects the contents of this material or

otherwise.

Without limiting the generality of the disclaimers stated above, users of this material are further notified that

MIPI: (a) does not evaluate, test or verify the accuracy, soundness or credibility of the contents of this

material; (b) does not monitor or enforce compliance with the contents of this material; and (c) does not

certify, test, or in any manner investigate products or services or any claims of compliance with MIPI

specifications or related material.

Questions pertaining to this material, or the terms or conditions of its provision, should be addressed to:

MIPI Alliance, Inc.

c/o IEEE-ISTO

445 Hoes Lane, Piscataway New Jersey 08854, United States

Attn: Managing Director

Version 2.0  Specification for UniPro 
19-Feb-2022 
  Copyright © 2007–2022 MIPI Alliance, Inc.  iii 
  All rights reserved. 
  Confidential 
Contents 
Figures ............................................................................................................................... ix 
Tables .................................................................................................................................xv 
Release History ............................................................................................................... xix 
Introduction .................................................................................................................1 
1  Scope ............................................................................................................................... 1 
2  Purpose ............................................................................................................................ 2 
Terminology .................................................................................................................3 
1  Definitions ....................................................................................................................... 3 
2  Service Primitives ............................................................................................................ 7 
3  Abbreviations ................................................................................................................... 8 
4  Acronyms ......................................................................................................................... 8 
References .................................................................................................................. 11 
Architecture Overview (informative) ......................................................................13 
1  UniPro Layering ............................................................................................................ 13 
2  Comparison of UniPro to the OSI/RM .......................................................................... 14 
3  Service Access Points (SAP) ......................................................................................... 15 
3.1  Service Primitives ..................................................................................................... 15 
3.2  SAP Significance ....................................................................................................... 15 
3.3  Data Flow Through the Stack .................................................................................... 15 
4  Signal Interfaces ............................................................................................................ 16 
4.1  CPort Signal Interface ............................................................................................... 16 
4.2  Interface to the Physical Layer .................................................................................. 16 
5  Protocol Data Units (PDU) ............................................................................................ 17 
6  Physical Layer (L1) ....................................................................................................... 18 
6.1  M-PHY Technology .................................................................................................. 18 
6.2  L1 Symbol Encoding ................................................................................................. 18 
6.3  M-PHY Data Rates .................................................................................................... 19 
6.4  M-PHY Power States ................................................................................................ 20 
6.5  L1 Idles...................................................................................................................... 20 
7  PHY Adapter Layer (L1.5) ............................................................................................ 21 
7.1  L1.5 Multi-Lane Support........................................................................................... 21 
7.2  L1.5 Power States and Power Modes ........................................................................ 22 
7.3  L1.5 and Symbol Encoding ....................................................................................... 24 
7.4  PACP frames as Used with M-PHY .......................................................................... 24 
7.5  L1.5 Automatic Capability Discovery (M-PHY only) .............................................. 25 
7.6  PHY Testing .............................................................................................................. 25 
8  Data Link Layer (L2) ..................................................................................................... 26 
8.1  L2 Data Frames ......................................................................................................... 26 
8.2  L2 Control Frames .................................................................................................... 27 
8.3  L2 Retransmission on Errors ..................................................................................... 27 
8.4  L2 Flow Control ........................................................................................................ 27 
8.5  L2 Traffic Classes and Priorities ............................................................................... 28 