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HDMI Forum Confidential Page 1 of 518
High-Definition Multimedia Interface
Specification Version 2.1
November 13, 2017
CONFIDENTIAL
Adopter: Pingping Jiang, Lontium Semiconductor Corporation - User(s): 2 -- Doc No.: 4.
Copyrights held by the HDMI Forum. All rights reserved. This file is subject to a license agreement.

HDMI Forum Confidential Page 2 of 518
Preface
Notice
THIS SPECIFICATION IS PROVIDED “AS IS” WITH NO WARRANTIES WHATSOEVER, EXPRESS OR IMPLIED, INCLUDING,
WITHOUT LIMITATION, NO WARRANTIES OF MERCHANTABILITY, NON-INFRINGEMENT, FITNESS FOR ANY PARTICULAR
PURPOSE, OR ANY WARRANTY OTHERWISE ARISING OUT OF ANY PROPOSAL, SPECIFICATION, OR SAMPLE.
HDMI Forum, Inc. (“HDMI Forum”) and its members disclaim all liability, including liability for infringement of any
proprietary rights, relating to use of information in This Specification.
Copyright 2013-2017 HDMI Forum, Inc. All rights reserved. No license, express or implied, by estoppel or otherwise, to
any intellectual property rights is granted herein. You must have a valid license, separately granted to you in writing by
the HDMI Forum or the HDMI Licensing Administrator, Inc., in order to use or implement this Specification. This
Specification is designated by the HDMI Forum as confidential. Unauthorized use, duplication, or disclosure is
prohibited. The terms HDMI and HDMI High-Definition Multimedia Interface, and the HDMI Logo are trademarks or
registered trademarks of HDMI Licensing Administrator, Inc. in the United States and other countries. Third-party
trademarks and service marks are property of their respective owners.
This Specification incorporates by reference the High Definition Multimedia Interface Specification Version 1.4b
(“HDMI Specification Version 1.4b”). This Specification also reproduces text segments from the HDMI Specification
Version 1.4b as explanatory text.
Text segments that are extracts or are otherwise derived from HDMI Specification Version 1.4b* have been copied
with permission of the owners, and are included here purely for ease of comprehension to avoid excessive references
to the earlier specification.
*The copyright in the HDMI Specification Version 1.4b is owned by Koninklijke Philips N.V.; Lattice Semiconductor
Corporation; Maxell, Ltd.; Panasonic Corporation; Sony Corporation; Technicolor S.A.; and Toshiba Corporation.
When this Specification reproduces text segments from the HDMI Specification Version 1.4b, the reference includes a
“double dagger” marker (‡) and the following statement at the beginning of the section: “This section incorporates
text from the HDMI Specification 1.4b. See Notice for copyright information.” Furthermore, such included text will be
presented in blue text with the “Century” font, a font that has serifs.
This Specification may also incorporate by reference other specifications published by third parties. Any Adopter of this
Specification is solely responsible for acquiring any licenses from such third parties that are necessary to access, use,
and/or implement such third parties’ specifications.
Super Interconnect Technologies LLC, a Texas limited liability company (“SIT”), owns certain patents that may read on
this Specification. SIT is not a member of the HDMI Forum and is therefore not automatically bound by the HDMI
Forum’s Intellectual Property Rights Policy. The HDMI Forum has entered into a Non-Assertion Agreement with SIT
under which SIT has agreed not to assert certain claims of such patents against any licensee of this Specification or its
affiliate with respect to such licensee’s or affiliate’s making, having made, use, importation, offer to sell, sale, lease,
promotion or other distribution of portions of products that implement and are compliant with relevant normative
requirements of this Specification. The Non-Assertion Agreement expressly provides that licensees and their affiliates
are third party beneficiaries of the non-assertion covenants contained in such agreement and may enforce their rights
directly against SIT. If you would like a copy of the Non-Assertion Agreement, please contact HDMI Forum
Administrator at adim@hdmiforum.com. You may be required, as a condition to receiving a copy fo the Non-Assertion
Adopter: Pingping Jiang, Lontium Semiconductor Corporation - User(s): 2 -- Doc No.: 4.
Copyrights held by the HDMI Forum. All rights reserved. This file is subject to a license agreement.

HDMI Forum Confidential Page 3 of 518
Agreement, to sign a confidentiality and non-disclosure agreement under which you agree to maintain the terms of
such Non-Assertion Agreement as confidential.
Although the HDMI Forum has not knowingly included in this Specification proprietary technology owned by any third
party who has not agreed to the patent non-assert covenants set forth in the HDMI Forum’s Intellectual Property
Rights Policy or equivalent non-assert covenants, the HDMI Forum has no obligation to and has not undertaken to
perform or conduct a patent search. The HDMI Forum makes no representations or warranties as to the existence or
absence of patent rights that read on this Specification. The HDMI Forum shall have no responsibility, obligation, or
liability to any person or entity, in any manner or circumstance, under any legal theory whatsoever, for failure to
recognize, disclose, or identify any patent rights or any owners or claimants thereof; for any incomplete or inaccurate
identification or disclosure of such rights, owners, or claimants; for any person’s use of or implementation of this
Specification; or for any peron’s use, manufacture, importation, sale, or offer for sale of products or services that
implement this Specification.
Adopter: Pingping Jiang, Lontium Semiconductor Corporation - User(s): 2 -- Doc No.: 4.
Copyrights held by the HDMI Forum. All rights reserved. This file is subject to a license agreement.

HDMI Forum Confidential Page 4 of 518
Document Revision History
Version 2.0
• The initial specification developed by the HDMI Forum.
Version 2.0a
• Minor Editorial Updates
• Incorporated the following released errata:
Errata 2.0.1: Updates to Appendix C
Errata 2.0.2: Updates to Appendix A
• Incorporated the following unreleased errata
Update to Section 10.4.4, clarifies limits for TestReadRequest transitions
Fill in missing cell in Table E-3
• Updates to support HDR Static Metadata
Added reference to CEA-861.3
Added EOTF to Section 4.3.2
Added Dynamic Range and Mastering InfoFrame to Table 8-1: Packet Types
Added Section 8.7: Dynamic Range and Mastering InfoFrame
Added Section 10.3.4: HDR Static Metadata Data Block
Version 2.0b
• Minor Editorial Updates
• Clarify when BT.2020 encoded pixels may be transmitted. (Section 7.2.2)
• Clarify which audio formats from CEA-861.2 may be used in conjunction with This
Specification (Section 9.1).
Version 2.1
• Editorial Updates
• Incorporated the following released errata:
Errata 2.0.3: Errata to HDMI 2.0b 3D L-PCM Audio
• Updated specification throughout for changes in CTA-861-G (from CEA-861-F)
Updated Section 7.1: YC
B
C
R
4:2:0 Pixel Encoding
Updated Section 7.2: Colorimetry
Updated Section 7.5: Additional Video Formats
Updated Section 8.3: Audio Metadata Packet
Updated Section 9.1: Supported Audio Formats
Added Section 9.3.6: CTA 3D Audio Channel/Speaker Assignment
Updated Section 10.1: Use of the AVI InfoFrame in This Specification
Added Section 10.3.5: CTA-861-G HDR Dynamic Metadata Data Block
Added Section 10.10.2.3: CTA-861-G HDR Dynamic Metadata Extended InfoFrame
• Added support for Category 3 Cables
Added Section 5 and subsections: Cables and Connectors
Added Appendix I: Category 3 Cable Assembly Reference Design (Informative)
(Continued below)
Adopter: Pingping Jiang, Lontium Semiconductor Corporation - User(s): 2 -- Doc No.: 4.
Copyrights held by the HDMI Forum. All rights reserved. This file is subject to a license agreement.

HDMI Forum Confidential Page 5 of 518
• Added support for Fixed Rate Link (FRL)
Added Section 6.4 and subsections: Fixed Rate Link (FRL) Electrical Characteristics
Added Section 6.5 and subsections: Fixed Rate Link - Link Layer
Added Section 6.6: FRL Character Error Detection
Added Section 6.7: FRL Content Protection
Added Section 7.8: FRL Video Support Requirements
Added Section 9.2.2: Recommended N and Expected CTS Values in FRL Mode
Updated Section 10.3.2: HDMI Forum Vendor Specific Data Block
Updated Section 10.4.1: Status and Control Data Channel Structure
• Added support for Variable Refresh Rate (VRR) and Fast Vactive (FVA)
Added Section 7.6: Variable Refresh Rate and Fast Vactive
Updated Section 10.3.2: HDMI Forum Vendor Specific Data Block
• Added support for Compressed Video Transport over FRL mode
Added Section 7.7: Compressed Video Transport
Updated Section 10.3.2: HDMI Forum Vendor Specific Data Block
• Added Extended Metadata Packet definition
Added Section 8.8: Extended Metadata Packet (EMP)
Updated Section 10.3.2: HDMI Forum Vendor Specific Data Block
Added Section 10.10: Extended Metadata Transport
• Added support for an Enhanced Audio Return Channel (eARC)
Added Section 9.5: Enhanced Audio Return Channel (eARC)
Added Appendix H: eARC Capabilities and E-EDID Relationship Examples
(Informative)
• Added support for Auto Low-Latency Mode
Updated Section 10.2: HDMI Forum Vendor Specific InfoFrame
Updated Section 10.3.2: HDMI Forum Vendor Specific Data Block
Added Section 10.11: Auto Low-Latency Mode
Added Appendix G: Auto Low-Latency Mode (Informative)
• Added support for Color Content Bits Per Component (CCBPC)
Updated Section 10.2: HDMI Forum Vendor Specific InfoFrame
Updated Section 10.3.2: HDMI Forum Vendor Specific Data Block
• Added Section 10.12: General Control Packets
• Added clarifying details related to Repeater operation
Added Section 12 and subsections: Repeaters
• Updated references, including:
Updated CEA 861.2, CEA 861.3, CEA-861-F to CTA-861-G
Added CTA-861-G Errata concerning AVI InfoFrame Version
Added VESA Display Stream Compression (DSC) Standard, Version 1.2a
Adopter: Pingping Jiang, Lontium Semiconductor Corporation - User(s): 2 -- Doc No.: 4.
Copyrights held by the HDMI Forum. All rights reserved. This file is subject to a license agreement.
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