1、 Copyright 2012 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 3 Barker Avenue, White Plains, NY 10601 (914) 761-1100 Approved October 8, 2012 Table of Contents Page Foreword . 2 Intellectual Property 2 Introduction 2 1 Scope . 3 2 Conformance Notation . 3 3 Normative References . 3 4 Sou
2、rce Data . 4 5 Parallel Data Format 4 6 Serial Data Format . 4 7 Coaxial Cable Interface 5 Annex A Bibliography (Informative) . 9 Annex B Channel Code (Informative) . 10 Page 1 of 10 pages SMPTE ST 424:2012 Revision of SMPTE 424M-2006 SMPTE STANDARD 3 Gb/s Signal/Data Serial Interface SMPTE ST 424:2
3、012 Page 2 of 10 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. SMPTEs Engineer
4、ing Documents, including Standards, Recommended Practices, and Engineering Guidelines, are prepared by SMPTEs 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, inclu
5、ding ISO, IEC and ITU. SMPTE Engineering Documents are drafted in accordance with the rules given in Part XIII of its Operations Manual. SMPTE ST 424 was prepared by Technology Committee 32NF. Intellectual Property At the time of publication no notice had been received by SMPTE claiming patent right
6、s 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
7、informative and does not form an integral part of this Engineering Document. This standard defines a bit-serial data interface for the transport of 3 Gb/s nominal component digital signals or packetized data. The SMPTE ST 425 set of standards define the mapping of various source image formats to the
8、 bit-serial data structure defined here in this document. SMPTE 425-0 contains an informative roadmap for 3 Gb/s Signal/Data Serial Interfaces. SMPTE ST 424:2012 Page 3 of 10 pages 1 Scope This standard defines a bit-serial data structure and coaxial cable interface for the transport of signals with
9、 a total payload of 2.970 Gb/s or 2.970/1.001 Gb/s. This standard specifies the electrical and physical characteristics of a coaxial cable interface suitable for applications where the signal loss does not exceed an amount specified by the receiver manufacturer. Typical loss amounts would be in the
10、range of up to 30 dB at one-half the clock frequency. 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 use
11、r, 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“ o
12、r 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
13、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“ ind
14、icate 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 ne
15、ver 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 no
16、t 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 l
17、anguage forms. 3 Normative References The following standards contain provisions that, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this
18、 standard are encouraged to investigate the possibility of applying the most recent edition of the standards indicated below. SMPTE ST 425-1:2011, Source Image Format and Ancillary Data Mapping for the 3Gb/s Serial Interface SMPTE RP 184:2004, Specification of Jitter in Bit Serial Digital Systems IE
19、C 61169-8 (2007-2), Part 8: Sectional Specification R.F. Coaxial Connectors with Inner Diameter of Outer Conductor 6,5 mm (0,256 in) with Bayonet Lock Characteristic Impedance 50 (Type BNC), Annex SMPTE ST 424:2012 Page 4 of 10 pages A (Normative) Information for Interface Dimensions of 75 Character
20、istic Impedance Connector with Unspecified Reflection Factor14 Source Data For this interface, the source data shall be a virtual interface consisting of two 10-bit parallel data streams data stream one and data stream two. The virtual interface shall be constructed in accordance with SMPTE ST 425-1
21、. Data for each line of data stream one and data stream two of the virtual interface are divided into four areas: EAV (end of active line) timing reference plus LN and CRC data words; the blanking area optionally containing ancillary data; SAV (start of active video) timing reference; and the digita
22、l active line as shown in Figure 1. 5 Parallel Data Format The 10-bit data words of parallel data stream one and data stream two of the virtual interface, are shown in Figure 1. By way of example, Figure 1 illustrates the mapping of SMPTE ST 274 4:2:2 (YCBCR)/10-bit signals at 60 or 60/1.001 frame r
23、ates. Data stream one of the virtual interfaceData stream two of the virtual interfaceEAV + Line number + CRCBlanking Area Blanking Codewords or Ancillary DataSAVEAV(3FFh)EAV(000h)EAV(000h)EAV(XYZh)EAV(3FFh)EAV(000h)EAV(000h)EAV(XYZh)LN0LN1LN0LN1CR0CR1CR0CR1SAV(3FFh)SAV(000h)SAV(000h)SAV(XYZh)SAV(3F
24、Fh)SAV(000h)SAV(000h)SAV(XYZh)Blanking AreaBlanking AreaDigital Active Line Active Picture or Ancillary dataY 0Y 1Y 2Y 3CR0CR1Y 1918Y 1919CR959Digital Active LineDigital Active LineCB959CB1CB0EAV + Line number + CRCEAV(3FFh)EAV(000h)EAV(000h)EAV(XYZh)EAV(3FFh)EAV(000h)EAV(000h)EAV(XYZh)LN0LN1LN0LN1C
25、R0CR1CR0CR1Figure 1 Example parallel data format for data stream one and data stream two of the virtual interface 6 Serial Data Format The two parallel data streams of the virtual interface are transmitted over a single channel in bit-serial form after word-multiplexing, parallel-to-serial conversio
26、n and scrambling have been applied. Data stream one and data stream two of the virtual interface shall be multiplexed word-by-word into a single 10-bit parallel stream in the order: data stream two; data stream one; data stream two.etc, as shown in Figure 2. 1Please note that the title of this norma
27、tive reference may be misleading. This standard requires the use of the 75ohm connector defined in Annex A ofthis reference.SMPTE ST 424:2012 Page 5 of 10 pages The single 10-bit parallel interface so produced shall have an interface frequency of 297 MHz or 297/1.001 MHz. Data stream one of the virt
28、ual interfaceData stream two of the virtual interfaceMultiplexed 10-bit parallel interfaceEAV(3FFh)EAV(000h)EAV(000h)EAV(XYZh)EAV(3FFh)EAV(000h)EAV(000h)EAV(XYZh)LN0LN1LN0LN1CR0CR1CR0CR1SAV(3FFh)SAV(000h)SAV(000h)SAV(XYZh)SAV(3FFh)SAV(000h)SAV(000h)SAV(XYZh)Blanking Codewords orOptional Ancillary Da
29、taBlanking Codewords orOptional Ancillary DataEAV(3FFh)EAV(3FFh)EAV(000h)EAV(000h)EAV(000h)EAV(000h)EAV(XYZh)EAV(XYZh)LN0LN0LN1LN1CR0CR0CR1CR1SAV(3FFh)SAV(3FFh)SAV(000h)SAV(000h)SAV(000h)SAV(000h)SAV(XYZh)SAV(XYZh)Blanking Codwrods orOptional Ancillary DataY 0Y 1Y 2Y 3CB0CR0CB1CR1Y 1918Y 1919CB959CR
30、959EAV(3FFh)EAV(000h)EAV(000h)EAV(XYZh)EAV(3FFh)EAV(000h)EAV(000h)EAV(XYZh)LN0LN1LN0LN1CR0CR1CR0CR1Digital Active LineDigital Active LineCB0Y 0CR0Y 1CB1Y 2CR1Y 3CR959Y 1919CB959Y 1918EAV(3FFh)EAV(3FFh)EAV(000h)EAV(000h)EAV(000h)EAV(000h)EAV(XYZh)EAV(XYZh)LN0LN0LN1LN1CR0CR0CR1CR1Digital Active LineFi
31、gure 2 10-bit multiplex of data stream one and data stream 2 Multiplexed data shall be serialized with the LSB (least significant bit) of each data word transmitted first at a serial data rate of 2.97 Gb/s or 2.97/1.001 Gb/s. The channel coding scheme shall be scrambled NRZI (non-return to zero inve
32、rted). (See Annex B.) The generator polynomial for the scrambled NRZ shall be G1(X) = X9 + X4 + 1. Polarity-free scrambled NRZI sequence data shall be produced by the generator polynomial G2(X) = X + 1. The input signal to the scrambler shall be positive logic, where the highest voltage represents d
33、ata 1 and the lowest voltage represents data 0. 7 Coaxial Cable Interface 7.1 Generator Signal Levels and Specifications These specifications are defined for measurement of the serial output of a source derived from a parallel domain signal. The output of the generator shall be measured across a 75-
34、ohm resistive load connected through a 1 meter coaxial cable and 75 ohm BNC connectors meeting the requirements defined in Section 7.2. Figure 3 depicts the measurement dimensions for amplitude, rise-time and overshoot. The generator shall have an unbalanced output circuit with a source impedance of
35、 75 ohms and a return loss of at least 15 dB over the frequency range of 5 MHz to one-half the clock frequency and at least 10 dB over the frequency range one-half the clock frequency up to the clock frequency of the signal being transmitted. SMPTE ST 424:2012 Page 6 of 10 pages Figure 3 Waveform me
36、asurement dimensions The peak-to-peak signal amplitude shall be 800 mV 10%. The dc offset, as defined by the mid-amplitude point of the signal, shall be nominally 0.0 V 0.5 V. The rise and fall times, determined between the 20% and 80% amplitude points shall be no greater than 135 ps and shall not d
37、iffer by more than 50 ps. Overshoot of the rising and falling edges of the waveform shall not exceed 10% of the amplitude. Output amplitude excursions due to signals with a significant dc component occurring for a horizontal line (pathological signals), shall not exceed 50 mV above or below the aver
38、age peak-to-peak signal envelope. (In effect, this specification defines a minimum output coupling time constant). The jitter in the timing of the transitions of the data signal shall be measured in accordance with SMPTE RP 184. Measurement parameters are defined in SMPTE RP 184 and shall have the v
39、alues shown in Table 1 for compliance with this standard. SMPTE ST 424:2012 Page 7 of 10 pages Table 1 Jitter specifications f1 10 Hz Timing jitter lower band edge f3 100 kHz Alignment jitter lower band edge f4 1/10 the clock rate Upper band edge A1 2 UI Timing jitter (Note 1) A2 0.3 UI Alignment ji
40、tter (UI = unit interval) (Note 2) Test signal Color bar test signal (Note 3) n 10 (preferred) Serial clock divided (Note 4) Notes: 1 Designers are cautioned that parallel signals could contain jitter up to 2 ns p-p. Direct conversion of such signals from parallel to serial could result in excessive
41、 serial signal jitter. 2 This should be considered an absolute maximum requirement. An alignment jitter specification of 0.2 UI or better is strongly recommended. 3 Color bars are chosen as a non-stressing test signal for jitter measurements. Use of a stressing signal with long runs of zeros could g
42、ive misleading results. 4 Use of a serial clock divider value of 10 could mask word correlated jitter components. 5 See SMPTE RP 184 for definition of terms. 7.2 Receiver Signal Levels and Specifications The receiver of the serial interface signal shall present an impedance of 75 ohms with a return
43、loss of at least 15 dB over a frequency range of 5 MHz to one-half the clock frequency of the signal being transmitted and at least 10 dB over a frequency range from one-half the clock frequency up to the clock frequency of the signal being transmitted. Receivers operating with input cable losses in
44、 the range of up to 30 dB at one-half the clock frequency are typical; however, receivers designed to work with greater or lesser signal attenuation are acceptable. When connected to a line driver operating at the lower limit of voltage permitted by Section 7.1, it is recommended but not required th
45、at the receiver correctly senses the binary data in the presence of the superimposed interfering signal at the following levels: dc 2.5V Below 5kHz 3.0 GHz based on a return loss at 3.0 GHz that is greater than 10 dB shall be used on equipment and installations that are compliant with this standard.
46、 The mechanical characteristics of the preferred connector shall conform to the 75-ohm BNC as defined in IEC 61169-8, Annex A. 7.3.2 Other connectors Other application-specific connector types may also be used so long as they meet the electrical requirements as defined in Section 7.3.1. Manufacturer
47、s are encouraged to indicate in publications which connector type is being used. 7.3.3 Cables 75-ohm video coax cable that is specified for operation at frequencies 3.0 GHz shall be used in installations that are compliant with this standard. It is necessary for the frequency response of the coaxial
48、 cable loss, in decibels, to be approximately proportional to 1/f from 1 MHz to the clock frequency of the signal being transmitted to ensure correct operation of automatic cable equalizers over moderate to maximum cable lengths. Return loss of the correctly terminated transmission line shall be gre
49、ater than 15 dB over a frequency range of 5 MHz to one-half the clock frequency of the signal being transmitted and greater than 10 dB over the range one-half the clock frequency to the clock frequency of the signal being transmitted. SMPTE ST 424:2012 Page 9 of 10 pages Annex A Bibliography (Informative) Note: All references in this document to other SMPTE documents use the current numbering style (e.g. SMPTE ST 297:2006) although, during a transitional phase, the docu
