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Copyright © 2008 by THE SOCIETY OF
MOTION PICTURE AND TELEVISION ENGINEERS
3 Barker Avenue, White Plains, NY 10601
(914) 761-1100
Approved
July 3, 2008
Table of Contents Page
Foreword ................................................................................................................................................. 2
Intellectual Property ................................................................................................................................ 2
Introduction ............................................................................................................................................. 2
1 Scope ................................................................................................................................................. 3
2 Conformance Notation ....................................................................................................................... 3
3 Normative References ....................................................................................................................... 3
4 Direct Mapping of Source Image Formats ......................................................................................... 4
4.1 20-Bit Virtual Interface ............................................................................................................... 5
4.1.1 Timing Reference Signals............................................................................................... 5
4.1.2 Line Numbers.................................................................................................................. 5
4.1.3 Line CRC Codes ............................................................................................................. 5
4.1.4 Ancillary Data .................................................................................................................. 6
4.1.5 Audio Data ...................................................................................................................... 6
4.1.6 Payloader Identifier ......................................................................................................... 7
4.2 Virtual Interface – Data Stream Mappings................................................................................. 8
4.2.1 Mapping Structure 1 – SMPTE 274M – 4:2:2 (Y'C'
B
C'
R
)/10-Bit Signals at 60,
60/1.001 and 50 Progressive Frames/Sec ................................................................ 8
4.2.2 Mapping Structure 2 – 4:4:4 (R'G'B') / (Y'C'
B
C'
R
) and 4:4:4:4 (R'G'B'+A)/
(Y'C'
B
C'
R
+A)//10-Bit Signals ..................................................................................... 10
4.2.3 Mapping Structure 3 – 4:4:4 (R'G'B')/(Y'C'
B
C'
R
)/(X'Y'Z') / 12-Bit Signals ....................... 11
4.2.4 Mapping Structure 4 – 4:2:2 (Y'C'
B
C'
R
)/12-Bit Signals at 30, 30/1.001, 25, 24,
and 24/1.001 Frame Rates and 60, 60/1.001 and 50 Field Rates............................. 14
5 Mapping of 2 x SMPTE 292 HD SDI Interfaces................................................................................. 16
5.1 20-Bit Virtual Interface ............................................................................................................... 16
5.2 Payload identifier........................................................................................................................ 17
5.2.1 Byte 1: Video Payload and Digital Interface Identification ............................................. 17
6 Levels of Operation (Informative)...................................................................................................... 18
6.1 Examples of Compliance Nomenclature.................................................................................... 18
Annex A Bibliography (Informative) ...................................................................................................... 19
Annex B Level B Mapping – 2 x SMPTE 292 HD SDI Interfaces (Informative)................................... 20
Page 1 of 21 pages
SMPTE 425-2008
Revision of
SMPTE 425M-2006
SMPTE STANDARD
3 GB/s Signal/Data
Serial Interface —
Source Image Format Mapping
SMPTE 425-2008
Page 2 of 21 pages
Foreword
SMPTE (the Society of Motion Picture and Television Engineers) is an internationally-recognized standards
developing organization. Headquartered and incorporated in the United States of America, SMPTE has
members in over 80 countries on six continents. SMPTE’s Engineering Documents, including Standards,
Recommended Practices and Engineering Guidelines, are prepared by SMPTE’s Technology Committees.
Participation in these Committees is open to all with a bona fide interest in their work. SMPTE cooperates
closely with other standards-developing organizations, including ISO, IEC and ITU.
SMPTE Engineering Documents are drafted in accordance with the rules given in Part XIII of its
Administrative Practices.
SMPTE Standard 425 was prepared by Technology Committee N26.
Intellectual Property
At the time of publication no notice had been received by SMPTE claiming patent rights essential to the
implementation of this Standard. However, attention is drawn to the possibility that some of the elements of
this document may be the subject of patent rights. SMPTE shall not be held responsible for identifying any or
all such patent rights.
Introduction
This section is entirely informative and does not form an integral part of this Engineering Document.
SMPTE 292 was originally developed to provide a serial digital connection between HDTV equipment
operating largely with 10-bit Y’/C’
B
/C’
R
4:2:2 signals to a maximum frame rate of 30 frames per second. Over
time, SMPTE 292 applications were expanded to include larger picture formats, higher refresh rates and to
provide support for R’G’B’ and 12-bit source signal formats and the carriage of packetized data.
The total data rate required to support these additional applications is 2.970 Gb/s or 2.970/1.001Gb/s and the
digital interface used to carry these payloads is currently realized using a dual-link structure as defined in
SMPTE 372M.
This standard defines the mapping of various source image formats onto a single link serial digital interface
operating at a nominal rate of 3Gb/s, offering an alternate method to SMPTE 372M for the transport of signals
with a total payload of 2.970 Gb/s or 2.970/1.001 Gb/s.
SMPTE 425-2008
Page 3 of 21 pages
1 Scope
This standard specifies the direct mapping of various television and D-Cinema source image formats as
defined in Table 1 below; the carriage of embedded audio; the carriage of ancillary data and the stream ID, in
a serial digital interface operating at a nominal rate of 3Gb/s.
This standard also specifies the mapping of 2 x SMPTE 292 HD SDI interfaces including SMPTE 372M into a
serial digital interface operating at a nominal rate of 3Gb/s.
2 Conformance Notation
Normative text is text that describes elements of the design that are indispensable or contains the
conformance language keywords: "shall", "should", or "may". Informative text is text that is potentially helpful
to the user, but not indispensable, and can be removed, changed, or added editorially without affecting
interoperability. Informative text does not contain any conformance keywords.
All text in this document is, by default, normative, except: the Introduction, any section explicitly labeled as
"Informative" or individual paragraphs that start with "Note:”
The keywords "shall" and "shall not" indicate requirements strictly to be followed in order to conform to the
document and from which no deviation is permitted.
The keywords, "should" and "should not" indicate that, among several possibilities, one is recommended as
particularly suitable, without mentioning or excluding others; or that a certain course of action is preferred but
not necessarily required; or that (in the negative form) a certain possibility or course of action is deprecated
but not prohibited.
The keywords "may" and "need not" indicate courses of action permissible within the limits of the document.
The keyword “reserved” indicates a provision that is not defined at this time, shall not be used, and may be
defined in the future. The keyword “forbidden” indicates “reserved” and in addition indicates that the provision
will never be defined in the future.
A conformant implementation according to this document is one that includes all mandatory provisions
("shall") and, if implemented, all recommended provisions ("should") as described. A conformant
implementation need not implement optional provisions ("may") and need not implement them as described.
Unless otherwise specified the order of precedence of the types of normative information in this document
shall be as follows. Normative prose shall be the authoritative definition. Tables shall be next, followed by
formal languages, then figures, and then any other language forms.
3 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this
recommended practice. At the time of publication, the editions indicated were valid. All standards are subject
to revision, and parties to agreements based on this recommended practice are encouraged to investigate the
possibility of applying the most recent edition of the standards indicated below.
SMPTE 274M-2008, Television — 1920 x 1080 Image Sample Structure, Digital Representation and Digital
Timing Reference Sequences for Multiple Picture Rates
SMPTE 291M-2006, Television — Ancillary Data Packet and Space Formatting
SMPTE 292-2008, 1.5 Gb/s Signal / Data Serial Interface
SMPTE 425-2008
Page 4 of 21 pages
SMPTE 296M-2001, Television — 1280 x 720 Progressive Image Sample Structure — Analog and Digital
Representation and Analog Interface
SMPTE 299M-2004, Television — 24-Bit Digital Audio Format for SMPTE 292M Bit-Serial Interface
SMPTE 352M-2002 for Television — Video Payload Identification for Digital Interfaces
SMPTE 372M-2002, Television — Dual Link 292M Interface for 1920 x 1080 Picture Raster.
SMPTE 428-9-2008, D-Cinema Distribution Master — Image Pixel Structure Level 3 — Serial Digital Interface
signal formatting
4 Direct Mapping of Source Image Formats
For this interface, the source data shall be an uncompressed 10-bit or 12-bit video signal corresponding to the
source image formats identified in Table 1, or packetized data.
An auxiliary component signal designated A or Alpha, may optionally accompany the R’G’B’ or Y’C’
B
C’
R
video
signal. Interfaces containing the auxiliary component are denoted as R’G’B’+A and Y’C’
B
C’
R
+A. The auxiliary
component is referred to as either the A channel or Alpha channel in this document. The A or Alpha channel
component if present shall have the same characteristics as the Y’ or G’ channel as defined in the source
image formatting document.
Table 1 – Source Image Formats
Mapping
Structure
Reference
SMPTE
Standard
Image Format
Signal Format Sampling
Structure/Pixel Depth
Frame/Field Rates
1
274M
1920 × 1080
4:2:2 (Y’C’
B
C’
R
)/10-bit
60, 60/1.001 and 50 Frames Progressive
4:4:4 (R’G’B’),
4:4:4:4 (R’G’B’ +A)/10-bit
296M 1280 x 720
4:4:4 (Y’C’
B
C’
R
),
4:4:4:4 (Y’C’
B
C’
R
+A)/10-bit
60, 60/1.001 and 50 Frames Progressive
30, 30/1.001, 25, 24 and 24/1.001 Frames
Progressive
4:4:4 (R’G’B’),
4:4:4:4 (R’G’B’ +A)/10-bit
2
274M 1920 x 1080
4:4:4 (Y’C’
B
C’
R
),
4:4:4:4 (Y’C’
B
C’
R
+A)/10-bit
60, 60/1.001 and 50 Fields Interlaced
30, 30/1.001, 25, 24 and 24/1.001 Frames
Progressive, PsF
4:4:4 (R’G’B’)/12-bit
274M 1920 x 1080
4:4:4 (Y’C’
B
C’
R
)/12-bit
60, 60/1.001 and 50 Fields Interlaced
30, 30/1.001, 25, 24 and 24/1.001 Frames
Progressive
3
428-1 2048 x 1080 4:4:4 (X’Y’Z’)/12-bit 24 Frames Progressive, PsF
4 274M 1920 x 1080 4:2:2 (Y’C’
B
C’
R
)/12-bit
30, 30/1.001, 25, 24 and 24/1.001 Frames
Progressive, PsF
60, 60/1.001 and 50 Fields Interlaced
SMPTE 425-2008
Page 5 of 21 pages
4.1 20-Bit Virtual Interface
R’, G’, B’, Y’, C’
B
, C’
R
, and A components shall be mapped into a virtual interface consisting of two parallel 10-
bit data streams – data stream one and data stream two, as shown in Figures 1 through 4.
Each data stream shall have an interface frequency of 148.5 MHz or 148.5/1.001 MHz.
Mapping of the data created by the signal format, sampling structure and pixel depth shall be in accordance
with § 4.2.1 through § 4.2.6 of this standard.
4.1.1 Timing Reference Signals
EAV (End of Active Video) and SAV (Start of Active Video), timing references shall be inserted into data
stream one and data stream two of the virtual interface on a line-by-line basis as shown in Figures 1 through 4.
The EAV and SAV sequence, F (field/ frame), V (vertical), H (horizontal) and parity bits P3 through P1 shall
be as defined in the source image formatting document.
Mapping of the timing reference signals into the virtual interface shall be in accordance with § 4.2.1 through § 4.2.6
of this standard.
4.1.2 Line Numbers
Line numbers shall be inserted into data stream one and data stream two of the virtual interface starting at the
first data word (of the virtual interface) following the EAV XYZ word, as shown in Figures 1 through 4.
The virtual interface line numbers shall be in accordance with the picture source line numbers as defined in
the source image formatting document.
Line number data are composed of two words, LN0 and LN1 and shall be as shown in Table 2.
Table 2 – Line Number Data
9 (msb) 8 7 6 5 4 3 2 1 0 (lsb)
LN0
B8
L6 L5 L4 L3 L2 L1 L0 Res Res
LN1
B8
Res Res Res L10 L9 L8 L7 Res Res
Notes:
1 L10 : L0 = line number in binary code.
2 Res = reserved, set to “0” and shall be ignored by receivers.
4.1.3 Line CRC Codes
CRC (Cyclic Redundancy Codes) shall be inserted into data stream one and data stream two of the virtual
interface starting at the first data word (of the virtual interface) following the final word of the line number –
LN1, as shown in Figures 1 through 4.
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