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MIPI Camera Serial Interface 2 (CSI-2).pdf
1 Overview
1.1 Scope
1.2 Purpose
2 Terminology
2.1 Definitions
2.2 Abbreviations
2.3 Acronyms
3 References
4 Overview of CSI-2
5 CSI-2 Layer Definitions
6 Camera Control Interface (CCI)
6.1 Data Transfer Protocol
6.1.1 Message Type
6.1.2 Read/Write Operations
6.2 CCI Slave Addresses
6.3 CCI Multi-Byte Registers
6.3.1 Overview
6.3.2 The Transmission Byte Order for Multi-byte Register Values
6.3.3 Multi-Byte Register Protocol
6.4 Electrical Specifications and Timing for I/O Stages
7 Physical Layer
8 Multi-Lane Distribution and Merging
8.1 Multi-Lane Interoperability
9 Low Level Protocol
9.1 Low Level Protocol Packet Format
9.1.1 Low Level Protocol Long Packet Format
9.1.2 Low Level Protocol Short Packet Format
9.2 Data Identifier (DI)
9.3 Virtual Channel Identifier
9.4 Data Type (DT)
9.5 Packet Header Error Correction Code
9.5.1 General Hamming Code Applied to Packet Header
9.5.2 Hamming-modified Code
9.5.3 ECC Generation on TX Side
9.5.4 Applying ECC on RX Side
9.6 Checksum Generation
9.7 Packet Spacing
9.8 Synchronization Short Packet Data Type Codes
9.8.1 Frame Synchronization Packets
9.8.2 Line Synchronization Packets
9.9 Generic Short Packet Data Type Codes
9.10 Packet Spacing Examples
9.11 Packet Data Payload Size Rules
9.12 Frame Format Examples
9.13 Data Interleaving
9.13.1 Data Type Interleaving
9.13.2 Virtual Channel Identifier Interleaving
10 Color Spaces
10.1 RGB Color Space Definition
10.2 YUV Color Space Definition
11 Data Formats
11.1 Generic 8-bit Long Packet Data Types
11.1.1 Null and Blanking Data
11.1.2 Embedded Information
11.2 YUV Image Data
11.2.1 Legacy YUV420 8-bit
11.2.2 YUV420 8-bit
11.2.3 YUV420 10-bit
11.2.4 YUV422 8-bit
11.2.5 YUV422 10-bit
11.3 RGB Image Data
11.3.1 RGB888
11.3.2 RGB666
11.3.3 RGB565
11.3.4 RGB555
11.3.5 RGB444
11.4 RAW Image Data
11.4.1 RAW6
11.4.2 RAW7
11.4.3 RAW8
11.4.4 RAW10
11.4.5 RAW12
11.4.6 RAW14
11.5 User Defined Data Formats
12 Recommended Memory Storage
12.1 General/Arbitrary Data Reception
12.2 RGB888 Data Reception
12.3 RGB666 Data Reception
12.4 RGB565 Data Reception
12.5 RGB555 Data Reception
12.6 RGB444 Data Reception
12.7 YUV422 8-bit Data Reception
12.8 YUV422 10-bit Data Reception
12.9 YUV420 8-bit (Legacy) Data Reception
12.10 YUV420 8-bit Data Reception
12.11 YUV420 10-bit Data Reception
12.12 RAW6 Data Reception
12.13 RAW7 Data Reception
12.14 RAW8 Data Reception
12.15 RAW10 Data Reception
12.16 RAW12 Data Reception
12.17 RAW14 Data Reception
Annex A JPEG8 Data Format (informative)
A.1 Introduction
A.2 JPEG Data Definition
A.3 Image Status Information
A.4 Embedded Images
A.5 JPEG8 Non-standard Markers
A.6 JPEG8 Data Reception
Annex B CSI-2 Implementation Example (informative)
B.1 Overview
B.2 CSI-2 Transmitter Detailed Block Diagram
B.3 CSI-2 Receiver Detailed Block Diagram
B.4 Details on the D-PHY implementation
B.4.1 CSI-2 Clock Lane Transmitter
B.4.2 CSI-2 Clock Lane Receiver
B.4.3 CSI-2 Data Lane Transmitter
B.4.4 CSI-2 Data Lane Receiver
Annex C CSI-2 Recommended Receiver Error Behavior (informative)
C.1 Overview
C.2 D-PHY Level Error
C.3 Packet Level Error
C.4 Protocol Decoding Level Error
Annex D CSI-2 Sleep Mode (informative)
D.1 Overview
D.2 SLM Command Phase
D.3 SLM Entry Phase
D.4 SLM Exit Phase
Annex E Data Compression for RAW Data Types (normative)
E.1 Predictors
E.1.1 Predictor1
E.1.2 Predictor2
E.2 Encoders
E.2.1 Coder for 10–8–10 Data Compression
E.2.2 Coder for 10–7–10 Data Compression
E.2.3 Coder for 10–6–10 Data Compression
E.2.4 Coder for 12–8–12 Data Compression
E.2.5 Coder for 12–7–12 Data Compression
E.2.6 Coder for 12–6–12 Data Compression
E.3 Decoders
E.3.1 Decoder for 10–8–10 Data Compression
E.3.2 Decoder for 10–7–10 Data Compression
E.3.3 Decoder for 10–6–10 Data Compression
E.3.4 Decoder for 12–8–12 Data Compression
E.3.5 Decoder for 12–7–12 Data Compression
E.3.6 Decoder for 12–6–12 Data Compression
Annex F JPEG Interleaving (informative)
Version 1.01.00 r0.04 2-Apr-2009
DRAFT MIPI Alliance Specification for CSI-2
DRAFT MIPI Alliance Specification for
Camera Serial Interface 2 (CSI-2)
Draft Version 1.01.00 Revision 0.04 – 2 April 2009
Further technical changes to this document are expected as work continues in the Camera Working Group
Copyright © 2005-2009 MIPI Alliance, Inc. All rights reserved.
MIPI Alliance Member Confidential.
Version 1.01.00 r0.04 2-Apr-2009
DRAFT MIPI Alliance Specification for CSI-2
NOTICE OF DISCLAIMER
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®. The material contained herein is provided on
an “AS IS” basis and 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 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.
All materials contained herein are 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, tradenames, and other intellectual property are the exclusive property of MIPI Alliance and
cannot be used without its express prior written permission.
ALSO, THERE IS NO WARRANTY OF CONDITION OF TITLE, QUIET ENJOYMENT, QUIET
POSSESSION, CORRESPONDENCE TO DESCRIPTION OR NON-INFRINGEMENT WITH REGARD
TO THIS MATERIAL OR THE CONTENTS OF THIS DOCUMENT. IN NO EVENT WILL ANY
AUTHOR OR DEVELOPER OF THIS MATERIAL OR THE CONTENTS OF THIS DOCUMENT 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, SPECIFICATION OR DOCUMENT RELATING TO THIS MATERIAL,
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Without limiting the generality of this Disclaimer stated above, the user of the contents of this Document is
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does not make any search or investigation for IPR, nor does MIPI require or request the disclosure of any
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Questions pertaining to this document, or the terms or conditions of its provision, should be addressed to:
MIPI Alliance, Inc.
c/o IEEE-ISTO
445 Hoes Lane
Piscataway, NJ 08854
Attn: Board Secretary
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Contents
Draft Version 1.01.00 Revision 0.04 – 2 April 2009 ........................................................................................ i
1 Overview ............................................................................................................................................... 16
1.1
1.2
Scope ............................................................................................................................................. 16
Purpose .......................................................................................................................................... 16
2
Terminology .......................................................................................................................................... 17
2.1
2.2
2.3
Definitions ..................................................................................................................................... 17
Abbreviations ................................................................................................................................ 18
Acronyms ...................................................................................................................................... 18
3 References ............................................................................................................................................. 20
4 Overview of CSI-2 ................................................................................................................................ 21
5 CSI-2 Layer Definitions ........................................................................................................................ 22
6 Camera Control Interface (CCI) ............................................................................................................ 24
6.1
Data Transfer Protocol ................................................................................................................... 24
6.1.1 Message Type ........................................................................................................................ 24
6.1.2
Read/Write Operations .......................................................................................................... 25
6.2
6.3
CCI Slave Addresses ..................................................................................................................... 28
CCI Multi-Byte Registers .............................................................................................................. 28
6.3.1
6.3.2
Overview ............................................................................................................................... 28
The Transmission Byte Order for Multi-byte Register Values .............................................. 30
6.3.3 Multi-Byte Register Protocol ................................................................................................. 31
6.4
Electrical Specifications and Timing for I/O Stages ...................................................................... 35
7
Physical Layer ....................................................................................................................................... 38
8 Multi-Lane Distribution and Merging ................................................................................................... 39
8.1 Multi-Lane Interoperability ........................................................................................................... 43
9
Low Level Protocol ............................................................................................................................... 46
9.1
Low Level Protocol Packet Format ............................................................................................... 46
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9.1.1
9.1.2
Low Level Protocol Long Packet Format .............................................................................. 46
Low Level Protocol Short Packet Format .............................................................................. 48
9.2
9.3
9.4
9.5
Data Identifier (DI) ........................................................................................................................ 48
Virtual Channel Identifier .............................................................................................................. 48
Data Type (DT) ............................................................................................................................. 49
Packet Header Error Correction Code ........................................................................................... 50
9.5.1
9.5.2
9.5.3
9.5.4
General Hamming Code Applied to Packet Header .............................................................. 51
Hamming-modified Code ...................................................................................................... 51
ECC Generation on TX Side ................................................................................................. 54
Applying ECC on RX Side .................................................................................................... 55
9.6
9.7
9.8
Checksum Generation .................................................................................................................... 56
Packet Spacing ............................................................................................................................... 58
Synchronization Short Packet Data Type Codes ........................................................................... 59
9.8.1
9.8.2
Frame Synchronization Packets ............................................................................................. 59
Line Synchronization Packets ................................................................................................ 60
9.9
Generic Short Packet Data Type Codes ......................................................................................... 60
9.10 Packet Spacing Examples .............................................................................................................. 61
9.11 Packet Data Payload Size Rules .................................................................................................... 63
9.12 Frame Format Examples ................................................................................................................ 64
9.13 Data Interleaving ........................................................................................................................... 66
9.13.1 Data Type Interleaving .......................................................................................................... 66
9.13.2 Virtual Channel Identifier Interleaving .................................................................................. 69
10
Color Spaces ...................................................................................................................................... 71
10.1 RGB Color Space Definition ......................................................................................................... 71
10.2 YUV Color Space Definition......................................................................................................... 71
11
Data Formats ..................................................................................................................................... 72
11.1 Generic 8-bit Long Packet Data Types .......................................................................................... 73
11.1.1 Null and Blanking Data ......................................................................................................... 73
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11.1.2
Embedded Information .......................................................................................................... 73
11.2 YUV Image Data ........................................................................................................................... 73
11.2.1
Legacy YUV420 8-bit ........................................................................................................... 74
11.2.2 YUV420 8-bit ........................................................................................................................ 76
11.2.3 YUV420 10-bit ...................................................................................................................... 79
11.2.4 YUV422 8-bit ........................................................................................................................ 81
11.2.5 YUV422 10-bit ...................................................................................................................... 82
11.3 RGB Image Data ........................................................................................................................... 83
11.3.1 RGB888 ................................................................................................................................. 84
11.3.2 RGB666 ................................................................................................................................. 85
11.3.3 RGB565 ................................................................................................................................. 86
11.3.4 RGB555 ................................................................................................................................. 87
11.3.5 RGB444 ................................................................................................................................. 88
11.4 RAW Image Data .......................................................................................................................... 88
11.4.1 RAW6 .................................................................................................................................... 89
11.4.2 RAW7 .................................................................................................................................... 89
11.4.3 RAW8 .................................................................................................................................... 90
11.4.4 RAW10 .................................................................................................................................. 91
11.4.5 RAW12 .................................................................................................................................. 92
11.4.6 RAW14 .................................................................................................................................. 93
11.5 User Defined Data Formats ........................................................................................................... 94
12
Recommended Memory Storage ....................................................................................................... 97
12.1 General/Arbitrary Data Reception ................................................................................................. 97
12.2 RGB888 Data Reception ............................................................................................................... 97
12.3 RGB666 Data Reception ............................................................................................................... 98
12.4 RGB565 Data Reception ............................................................................................................... 99
12.5 RGB555 Data Reception ............................................................................................................... 99
12.6 RGB444 Data Reception ............................................................................................................... 99
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12.7 YUV422 8-bit Data Reception .................................................................................................... 100
12.8 YUV422 10-bit Data Reception .................................................................................................. 100
12.9 YUV420 8-bit (Legacy) Data Reception ..................................................................................... 101
12.10
YUV420 8-bit Data Reception ................................................................................................ 102
12.11
YUV420 10-bit Data Reception .............................................................................................. 103
12.12
RAW6 Data Reception ............................................................................................................ 105
12.13
RAW7 Data Reception ............................................................................................................ 105
12.14
RAW8 Data Reception ............................................................................................................ 105
12.15
RAW10 Data Reception .......................................................................................................... 106
12.16
RAW12 Data Reception .......................................................................................................... 106
12.17
RAW14 Data Reception .......................................................................................................... 107
Annex A JPEG8 Data Format (informative) ............................................................................................... 108
A.1
A.2
A.3
A.4
A.5
A.6
Introduction ................................................................................................................................. 108
JPEG Data Definition .................................................................................................................. 109
Image Status Information ............................................................................................................ 109
Embedded Images........................................................................................................................ 111
JPEG8 Non-standard Markers ..................................................................................................... 112
JPEG8 Data Reception ................................................................................................................ 112
Annex B CSI-2 Implementation Example (informative) ............................................................................. 113
B.1 Overview ..................................................................................................................................... 113
B.2 CSI-2 Transmitter Detailed Block Diagram ................................................................................ 113
B.3 CSI-2 Receiver Detailed Block Diagram ..................................................................................... 114
B.4 Details on the D-PHY implementation ........................................................................................ 115
B.4.1
CSI-2 Clock Lane Transmitter ............................................................................................. 117
B.4.2
CSI-2 Clock Lane Receiver ................................................................................................. 117
B.4.3
CSI-2 Data Lane Transmitter ............................................................................................... 118
B.4.4
CSI-2 Data Lane Receiver ................................................................................................... 120
Annex C CSI-2 Recommended Receiver Error Behavior (informative) ..................................................... 122
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C.1 Overview ..................................................................................................................................... 122
C.2 D-PHY Level Error ..................................................................................................................... 123
C.3
C.4
Packet Level Error ....................................................................................................................... 123
Protocol Decoding Level Error .................................................................................................... 124
Annex D CSI-2 Sleep Mode (informative) .................................................................................................. 126
D.1 Overview ..................................................................................................................................... 126
D.2
D.3
D.4
SLM Command Phase ................................................................................................................. 126
SLM Entry Phase ......................................................................................................................... 126
SLM Exit Phase ........................................................................................................................... 127
Annex E Data Compression for RAW Data Types (normative) .................................................................. 128
E.1
Predictors ..................................................................................................................................... 129
E.1.1
Predictor1 ............................................................................................................................ 130
E.1.2
Predictor2 ............................................................................................................................ 130
E.2
Encoders ...................................................................................................................................... 131
E.2.1
Coder for 10–8–10 Data Compression ................................................................................ 131
E.2.2
Coder for 10–7–10 Data Compression ................................................................................ 133
E.2.3
Coder for 10–6–10 Data Compression ................................................................................ 136
E.2.4
Coder for 12–8–12 Data Compression ................................................................................ 138
E.2.5
Coder for 12–7–12 Data Compression ................................................................................ 141
E.2.6
Coder for 12–6–12 Data Compression ................................................................................ 145
E.3 Decoders ...................................................................................................................................... 148
E.3.1
Decoder for 10–8–10 Data Compression ............................................................................. 148
E.3.2
Decoder for 10–7–10 Data Compression ............................................................................. 150
E.3.3
Decoder for 10–6–10 Data Compression ............................................................................. 153
E.3.4
Decoder for 12–8–12 Data Compression ............................................................................. 156
E.3.5
Decoder for 12–7–12 Data Compression ............................................................................. 159
E.3.6
Decoder for 12–6–12 Data Compression ............................................................................. 163
Annex F JPEG Interleaving (informative) ................................................................................................... 168
Copyright © 2005-2009 MIPI Alliance, Inc. All rights reserved.
MIPI Alliance Member Confidential.
vii
Version 1.01.00 r0.04 2-Apr-2009
Figures
Figure 1 CSI-2 and CCI Transmitter and Receiver Interface ....................................................................... 21
DRAFT MIPI Alliance Specification for CSI-2
Figure 2 CSI-2 Layer Definitions ................................................................................................................. 22
Figure 3 CCI Message Types ....................................................................................................................... 25
Figure 4 CCI Single Read from Random Location ...................................................................................... 25
Figure 5 CCI Single Read from Current Location ........................................................................................ 26
Figure 6 CCI Sequential Read Starting from a Random Location ............................................................... 26
Figure 7 CCI Sequential Read Starting from the Current Location .............................................................. 27
Figure 8 CCI Single Write to a Random Location ....................................................................................... 27
Figure 9 CCI Sequential Write Starting from a Random Location ............................................................... 28
Figure 10 Corruption of a 32-bit Wide Register during a Read Message ..................................................... 29
Figure 11 Corruption of a 32-bit Wide Register during a Write Message .................................................... 30
Figure 12 Example 16-bit Register Write ..................................................................................................... 30
Figure 13 Example 32-bit Register Write (address not shown) .................................................................... 31
Figure 14 Example 64-bit Register Write (address not shown) .................................................................... 31
Figure 15 Example 16-bit Register Read ...................................................................................................... 32
Figure 16 Example 32-bit Register Read ...................................................................................................... 33
Figure 17 Example 16-bit Register Write ..................................................................................................... 34
Figure 18 Example 32-bit Register Write ..................................................................................................... 35
Figure 19 CCI Timing .................................................................................................................................. 37
Figure 20 Conceptual Overview of the Lane Distributor Function .............................................................. 39
Figure 21 Conceptual Overview of the Lane Merging Function .................................................................. 40
Figure 22 Two Lane Multi-Lane Example ................................................................................................... 41
Figure 23 Three Lane Multi-Lane Example ................................................................................................. 42
Figure 24 Four Lane Multi-Lane Example ................................................................................................... 43
Figure 25 One Lane Transmitter and Four Lane Receiver Example ............................................................ 44
Figure 26 Two Lane Transmitter and Four Lane Receiver Example ........................................................... 44
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