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MIPI D-PHY is a popular PHY for cameras and displays in smartphones because it is a flexible, high-speed, low-power and low-cost solution. It can be applied for many other use cases, such as automotive camera sensing systems, collision avoidance radars, in-car infotainment and dashboard displays.
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MIPI Alliance Specification for D-PHY v0.90.00
* Cautions and Notes to Implementers and Reviewers *
Adopted MIPI Specification:
This document is a MIPI Specification adopted by the MIPI Board of Directors. MIPI member
companies’ rights and obligations apply to this MIPI Specification as defined in the MIPI Membership
Agreement and MIPI Bylaws.
Recommended for Implementation:
It is the good faith expectation of the MIPI PHY Working Group that D-PHY v0.90.00 is stable and
robust. The MIPI Alliance currently recommends that any member companies considering
implementation of D-PHY base their work on v0.90.00.
Past Revisions:
For avoidance of doubt, MIPI Alliance strongly recommends that member companies NOT implement
the previously adopted D-PHY v0.65, which is superseded by v0.90.00.
Future Revisions and Pending Changes:
It is the good faith expectation of the MIPI PHY WG that there will be no significant functional
changes to the fundamental technology described in this specification. Currently known areas of
discussion (as of November 2007) which may conceivably result in incremental changes are
described below. If any such changes are pursued, every reasonable effort will be made to
ensure backward compatibility of future versions and forward compatibility of this version.
• The PHY Working Group expects to gain important insight into D-PHY as silicon
implementations are completed by member companies and interoperability and/or
conformance testing begins on that silicon. If such post-silicon insight indicates that
further revision to v0.90.00 could substantially improve interoperability, ease
implementation, or aid testing, the working group MAY make further changes to the
specification.
• The MIPI Alliance is initiating a program to aid in conformance and interoperability testing
for several MIPI Specifications, including D-PHY. This program is likely to involve direct
interaction between contracted, external test organization(s) and the MIPI PHY WG and
may eventually result in test definitions and/or procedures being added to the D-PHY
Specification.
• The MIPI PHY Working Group is investigating the possibility to relax some S-parameter
specifications from section 7 of D-PHY v0.90.00, particularly those related to section 7.7
“Driver and Receiver Characteristics”. If this investigation results in a specification
modification, the changes will be backward compatible, such that they will not impact
interoperability between devices.
• The D-PHY Specification requires that powered-up Lanes be initialized simultaneously,
but some corresponding protocol specifications may not mention this. The D-PHY
specification will continue to describe this requirement until all corresponding protocol
specifications are updated.
• Throughout the document, the upper-case/lower-case distinction between the terms
‘events’/ ’Events’ is inconsistent, particularly in the context of Lane type descriptors but
also in the remaining specification text. A future specification revision is likely to include
changes which define this term and ensure it is used consistently in the specification.
• The parameters related to T
LPX
are specified such that they are not measurable. A future
release may make a change to the T
LPX
parameters such that they are measurable. Any
such change will be backward compatible.
• In the current specification version, T
LPX
in the drawing of Fig 15 can not be measured
from the D
n
V
IL(max)
till the next D
p
V
IL(max)
. The PHY working group recognizes that a split
of T
LPX
into external and internal would have been beneficial. The specification currently
has an intended maximum LP signal rate, which theoretically can be exceeded.
• The PPI in Annex A will remain informative.
Version 0.90.00 8-Oct-2007 MIPI Alliance Specification for D-PHY
Copyright © 2007 MIPI Alliance, Inc. All rights reserved.
MIPI Alliance Member Confidential.
MIPI Alliance Specification for D-PHY
Version 0.90.00 – 8 October 2007
MIPI Board Approved 13-Nov-2007
Further technical changes to D-PHY are expected as work continues in the PHY Working Group
Version 0.90.00 8-Oct-2007 MIPI Alliance Specification for D-PHY
Copyright © 2007 MIPI Alliance, Inc. All rights reserved.
MIPI Alliance Member Confidential.
ii
NOTICE OF DISCLAIMER 1
The material contained herein is not a license, either expressly or impliedly, to any IPR owned or 2
controlled by any of the authors or developers of this material or MIPI. The material contained herein is 3
provided on an “AS IS” basis and to the maximum extent permitted by applicable law, this material is 4
provided AS IS AND WITH ALL FAULTS, and the authors and developers of this material and MIPI 5
hereby disclaim all other warranties and conditions, either express, implied or statutory, including, but not 6
limited to, any (if any) implied warranties, duties or conditions of merchantability, of fitness for a 7
particular purpose, of accuracy or completeness of responses, of results, of workmanlike effort, of lack of 8
viruses, and of lack of negligence. 9
ALSO, THERE IS NO WARRANTY OF CONDITION OF TITLE, QUIET ENJOYMENT, QUIET 10
POSSESSION, CORRESPONDENCE TO DESCRIPTION OR NON-INFRINGEMENT WITH 11
REGARD TO THIS MATERIAL OR THE CONTENTS OF THIS DOCUMENT. IN NO EVENT WILL 12
ANY AUTHOR OR DEVELOPER OF THIS MATERIAL OR THE CONTENTS OF THIS DOCUMENT 13
OR MIPI BE LIABLE TO ANY OTHER PARTY FOR THE COST OF PROCURING SUBSTITUTE 14
GOODS OR SERVICES, LOST PROFITS, LOSS OF USE, LOSS OF DATA, OR ANY INCIDENTAL, 15
CONSEQUENTIAL, DIRECT, INDIRECT, OR SPECIAL DAMAGES WHETHER UNDER 16
CONTRACT, TORT, WARRANTY, OR OTHERWISE, ARISING IN ANY WAY OUT OF THIS OR 17
ANY OTHER AGREEMENT, SPECIFICATION OR DOCUMENT RELATING TO THIS MATERIAL, 18
WHETHER OR NOT SUCH PARTY HAD ADVANCE NOTICE OF THE POSSIBILITY OF SUCH 19
DAMAGES. 20
Without limiting the generality of this Disclaimer stated above, the user of the contents of this Document is 21
further notified that MIPI: (a) does not evaluate, test or verify the accuracy, soundness or credibility of the 22
contents of this Document; (b) does not monitor or enforce compliance with the contents of this Document; 23
and (c) does not certify, test, or in any manner investigate products or services or any claims of compliance 24
with the contents of this Document. The use or implementation of the contents of this Document may 25
involve or require the use of intellectual property rights ("IPR") including (but not limited to) patents, 26
patent applications, or copyrights owned by one or more parties, whether or not Members of MIPI. MIPI 27
does not make any search or investigation for IPR, nor does MIPI require or request the disclosure of any 28
IPR or claims of IPR as respects the contents of this Document or otherwise. 29
Questions pertaining to this document, or the terms or conditions of its provision, should be addressed to: 30
MIPI Alliance, Inc. 31
c/o IEEE-ISTO 32
445 Hoes Lane 33
Piscataway, NJ 08854 34
Attn: Board Secretary 35
36
Version 0.90.00 8-Oct-2007 MIPI Alliance Specification for D-PHY
Copyright © 2007 MIPI Alliance, Inc. All rights reserved.
MIPI Alliance Member Confidential.
iii
Contents 37
Version 0.90.00 – 8 October 2007 ................................................................................................................... i
38
1
Overview ............................................................................................................................................... 1439
1.1
Scope ............................................................................................................................................. 1440
1.2
Purpose .......................................................................................................................................... 1541
2
Terminology .......................................................................................................................................... 1642
2.1
Definitions ..................................................................................................................................... 1643
2.2
Abbreviations ................................................................................................................................ 1744
2.3
Acronyms ...................................................................................................................................... 1745
3
D-PHY Introduction .............................................................................................................................. 2046
3.1
Summary of PHY Functionality .................................................................................................... 2047
3.2
Mandatory Functionality ............................................................................................................... 2048
4
Architecture ........................................................................................................................................... 2149
4.1
Lane Modules ................................................................................................................................ 2150
4.2
Master and Slave ........................................................................................................................... 2251
4.3
High Frequency Clock Generation ................................................................................................ 2252
4.4
Clock Lane, Data Lanes and the PHY-Protocol Interface ............................................................. 2253
4.5
Selectable Lane Options ................................................................................................................ 2354
4.6
Lane Module Types ....................................................................................................................... 2555
4.6.1
Unidirectional Data Lane ....................................................................................................... 2656
4.6.2
Bi-directional Data Lanes ...................................................................................................... 2657
4.6.3
Clock Lane ............................................................................................................................. 2758
4.7
Configurations ............................................................................................................................... 2759
4.7.1
Unidirectional Configurations ............................................................................................... 2960
4.7.2
Bi-Directional Half-Duplex Configurations .......................................................................... 3161
4.7.3
Mixed Data Lane Configurations .......................................................................................... 3262
5
Global Operation ................................................................................................................................... 3363
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