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mipi_C-PHY_specification_v2-1.pdf
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Copyright © 2013–2021 MIPI Alliance, Inc.
All rights reserved.
Confidential
Specification for
C-PHY
SM
Version 2.1 – 1 April 2021
MIPI Board Adopted 21 July 2021
* NOTE 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.
Copyright © 2013–2021 MIPI Alliance, Inc.
All rights reserved.
Confidential
This page intentionally left blank.
Copyright © 2013–2021 MIPI Alliance, Inc.
All rights reserved.
Confidential
Specification for
C-PHY
SM
Version 2.
1
1 April 20
21
MIPI Board Adopted 21 July 2021
Further technical changes to this document are expected as work continues in the
C-PHY Working
Group.
Specification for C-PHY Version 2.1
01-Apr-2021
ii Copyright © 2013–2021 MIPI Alliance, Inc.
All rights reserved.
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
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CONDITION OF TITLE, QUIET ENJOYMENT, QUIET POSSESSION, CORRESPONDENCE TO
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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,
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MIPI does not make any search or investigation for IPR, nor does MIPI require or request the disclosure of
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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
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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 2.1 Specification for C-PHY
01-Apr-2021
Copyright © 2013–2021 MIPI Alliance, Inc. iii
All rights reserved.
Confidential
Contents
Figures ............................................................................................................................... ix
Tables ............................................................................................................................... xiii
Release History ............................................................................................................... xvi
1 Introduction .............................................................................................................. 1
1.1 Scope ........................................................................................................................... 1
1.2 Purpose ....................................................................................................................... 2
2 Terminology .............................................................................................................. 3
2.1 Use of Special Terms .................................................................................................. 3
2.2 Definitions .................................................................................................................. 3
2.3 Abbreviations .............................................................................................................. 4
2.4 Acronyms .................................................................................................................... 4
3 References ................................................................................................................. 6
4 C-PHY Overview ...................................................................................................... 7
4.1 Summary of PHY Functionality ................................................................................. 8
4.1.1 Summary of Lane Signaling States ................................................................ 8
4.1.2 Representation of Symbols in High-Speed Mode ........................................ 10
4.1.3 Representation of High-Speed Signaling States .......................................... 11
4.2 Mandatory Functionality ........................................................................................... 11
5 Architecture ............................................................................................................ 13
5.1 Lane Modules ........................................................................................................... 13
5.2 Primary and Secondary ............................................................................................. 14
5.3 High Frequency Clock Generation ........................................................................... 15
5.4 Lanes and the PHY-Protocol Interface ...................................................................... 16
5.5 Selectable Lane Options ........................................................................................... 16
5.6 Lane Module Types ................................................................................................... 18
5.6.1 Unidirectional Lane ..................................................................................... 19
5.6.2 Bi-Directional Lanes .................................................................................... 19
5.7 Configurations .......................................................................................................... 20
5.7.1 Unidirectional Configurations ..................................................................... 22
5.7.2 Bi-Directional Half-Duplex Configurations ................................................ 23
5.7.3 Mixed Lane Configurations ......................................................................... 24
6 Global Operation .................................................................................................... 25
6.1 Transmission Data Structure ..................................................................................... 25
6.1.1 Data Units .................................................................................................... 25
6.1.2 Bit Order, Serialization, and De-Serialization ................................
............. 25
6.1.3 Encoding, Decoding, Mapping and De-Mapping ........................................ 25
6.1.4 Data Buffering ............................................................................................. 37
6.2 Lane States and Line Levels ..................................................................................... 37
6.2.1 HS and LP Mode Line States and Line Levels ............................................ 37
6.2.2 ALP Mode Line States and Line Levels ...................................................... 39
6.3 Operating Modes: Control, High-Speed, and Escape ............................................... 40
6.3.1 HS and LP Operating Modes ....................................................................... 40
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