1、 Table of contents 1 Scope 2 Normative references 3 General specifications 4 Header data specifications 5 Payload data formats 1 Scope This standard provides the mechanisms necessary to facilitate the transport of packetized data over a synchronous data carrier. The HD-SDTI data packets and synchron
2、izing signals provide a data transport interface which is compatible with SMPTE 292M (HD-SDI) such that it can be readily used by the infrastructure provided by this standard. The standard uses a dual-channel operation where each line carries two data channels each forming an independent HD-SDTI dat
3、a transport mechanism. The two channels are word-multiplexed onto the HD-SDI stream such that one line-channel occupies the C data space and the other line-channel occupies the Y data space. The standard provides for a baseline operation which supports a constant payload length per line-channel havi
4、ng a maximum payload data rate up to approximately 1.0 Gb/s. It further provides for an extended operation which supports a variable payload length through the advancement of the SAV sequence to ensure a constant payload data rate regardless of the HD-SDI frame rate. The HD-SDTI protocol is compatib
5、le with SMPTE 305M. Additional documents shall be used to describe the payloads of particular applications of this standard including details of the data formatting and other parameters such as compression and error correction, if applicable. Page 1 of 13 pages SMPTE 348M-2005 Revision of SMPTE 348M
6、-2000 SMPTE STANDARD for Television High Data-Rate Serial Data Transport Interface (HD-SDTI) Copyright 2005 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 3 Barker Avenue, White Plains, NY 10601 (914) 761-1100 Approved December 9, 2005 SMPTE 348M-2005 Page 2 of 13 pages 2 Normative refere
7、nces The following standards contain provisions which, 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 standard are encouraged to inve
8、stigate the possibility of applying the most recent edition of the standards indicated below. ANSI/SMPTE 125M-1995, Television Component Video Signal 4:2:2 Bit-Parallel Digital Interface SMPTE 291M-1998, Television Ancillary Data Packet and Space Formatting SMPTE 292M-1998, Television Bit-Serial Dig
9、ital Interface for High-Definition Television Systems SMPTE 299M-2004, Television 24-Bit Digital Audio Format for SMPTE 292M Bit-Serial Interface SMPTE 305M-2005, Television Serial Data Transport Interface ITU-T X.25 (10/96), Interface Between Data Terminal Equipment (DTE) and Data Circuit-Terminati
10、ng Equipment (DCE) for Terminals Operating in the Packet Mode and Connected to Public Data Networks by Dedicated Circuit 3 General specifications This standard describes the assembly of two channels of 10-bit words multiplexed onto one HD-SDI line for the purpose of transporting the data streams in
11、a structured framework. The HD-SDTI data blocks and synchronizing signals provide a data transport protocol which can readily be added to the infrastructure provided by SMPTE 292M. SMPTE 292M requires a sequence of 10-bit words which define a television horizontal line comprising five areas in the f
12、ollowing sequence (note: the first 2 areas are often described together): EAV: a 4-word unique timing sequence defining the end of active video (of the previous line); LN/CRC: 2 words defining the line number followed by a 2-word CRC error detection code; Digital line blanking; SAV: a 4-word unique
13、timing sequence defining the start of active video; and Digital active line. An associated television source format standard defines the rate of television horizontal lines by defining the following parameters: The number of words per line; The number of words in the digital active line (and hence t
14、he number of words in the digital line blanking period); The number of lines per frame; and The number of frames per second. SMPTE 292M currently defines 3 source format standards (1035, 1080, and 720 active lines per frame). ANSI/SMPTE 125M describes the meaning of the EAV and SAV word sequences wh
15、ich can be applied to all relevant source formats. A decoder of this standard shall not be required to decode all the source formats available to SMPTE 292M. The source formats which must be supported by the decoder shall be specified in the application document. SMPTE 348M-2005 Page 3 of 13 pages 3
16、.1 HD-SDTI Mapping onto HD-SDI The source format in combination with SMPTE 292M provide the bit-serial format formed from C/Y word-multiplexed channels as illustrated in figure 1. HD-SDIEncoderEqualiserHD-SDIDecoderC Data InputClock Input10 bitsSMPTE 292MHD-SDTIFormatterC Data InputClock Input8 (9)
17、bitsHD-SDTIDeformatterSMPTE292MC DataClock10 bitsY Data Input10 bitsC Data OutputClock Output10 bitsY Data Output10 bitsY Data10 bitsY Data Input8 (9) bitsSerialDataSerialDataC DataClock10 bitsY Data10 bitsC Data OutputClock Output8 (9) bitsY Data Output8 (9) bitsHD-SDTIFigure 1 Arrangement of HD-SD
18、TI wrapped around SMPTE 292M The HD-SDTI data shall be serialized, scrambled, coded, and interfaced according to SMPTE 292M and the associated source format standard. The signal specifications and connector types shall be as described in SMPTE 292M. The data word length shall be 10 bits defined as b
19、its B0 through to B9. B0 is the least significant bit (LSB) and B9 is the most significant bit (MSB). The order of bit-transmission shall be LSB first as defined in SMPTE 292M. Source data shall be in groups of four 10-bit words representing a word-multiplexed CB, Y1, CR, Y2signal, where CBand CRfor
20、m one parallel C-data channel and Y1and Y2form a second parallel Y-data channel. The C/Y word clock rate shall be exactly 74.25 MW/s for those picture rates which are an exact integer number per second and shall be 74.25/1.001 MW/s for those picture rates which are offset by a divisor of 1.001. The
21、bit clock rate shall be 20 times the C/Y word clock rate (i.e. 1.485 Gb/s or 1.485/1.001 Gb/s). The timing reference signals, EAV and SAV, shall occur on every line and shall be C/Y interleaved as described in the source format document. The line number (LN) and CRC shall occur on every line and sha
22、ll be C/Y interleaved as described in SMPTE 292M. The HD-SDTI header data shall be encapsulated by an ancillary data packet according to SMPTE 291M and placed in the data space between the end of the EAV/LN/CRC and the beginning of the SAV. SMPTE 348M-2005 Page 4 of 13 pages The HD-SDTI payload shal
23、l be placed between the end of the SAV and the beginning of the EAV. There shall be space for two HD-SDTI header data and payloads per line. The first HD-SDTI header data and payload shall use the C data channel and the second HD-SDTI header data and payload shall use the Y data channel. The two cha
24、nnels shall be word multiplexed according to SMPTE 292M. Each C/Y multiplexed line is treated as a separate HD-SDTI payload. Any line may carry an HD-SDTI payload on either the C-channel or the Y-channel. Where a line carries both C-channel and Y-channel payloads, the C-channel payload shall be assu
25、med first in time, followed by the Y-channel payload. Figure 2 shows the data placement of the two HD-SDTI header data and payloads for one line. EAV/LN/CRCC-channelHeaderDataSAVH-AncSpaceC-channel User Data AreaC-channel Ancillary Data C-Channel Payload AreaEAV/LN/CRCY-channelHeaderDataSAVH-AncSpac
26、eY-channel User Data AreaY-channel Ancillary Data Y-Channel Payload AreaFigure 2 General layout of the dual-channel HD-SDTI header data and payload 3.2 Extended mode for constant payload data rate The default HD-SDTI payload for each channel is the defined C/Y digital active line- period for the sou
27、rce format at all picture rates. An optional extension mode allows source formats which would otherwise reduce the payload data rate, to advance the timing of the SAV marker so that the payload data rate remains a constant value. In extended mode, the constant payload data rate value is either exact
28、ly 129.6 MB/s or 129.6/1.001 MB/s depending on whether the frame rate of the source format includes a 1.001 divisor. The payload length values associated with particular source formats are given in table 1. Table 1 Payload length extension values for varying source frame rates Frame rate Total lines
29、 per frame Samples per line Blanking length Payload length Gross (Y+C) payload rate 25 1125 2640 336 2304 129.6 MB/s 24 (24/1.001) 1125 2750 350 2400 129.6 MB/s 60 (60/1.001) 750 1650 210 1440 129.6 MB/s 50 750 1980 252 1728 129.6 MB/s 30 (30/1.001) 750 3300 420 2880 129.6 MB/s 25 750 3960 504 3456
30、129.6 MB/s 24 (24/1.001) 750 4125 525 3600 129.6 MB/s SMPTE 348M-2005 Page 5 of 13 pages NOTES 1 Not all equipment may support the extended mode. Users are cautioned to check whether advancement of the SAV is supported by the HD-SDI infrastructure and the HD-SDTI decoder. 2 Table 1 does not include
31、the default frame rates of 30 Hz and 30/1.001 Hz for 1125 line interfaces as these offer the gross payload rate without changing the digital active line period. 3.3 Double-rate operation The source format may allow frequencies of double the baseline rate to accommodate the carriage of progressively
32、scan pictures at the rates of 50 Hz, 60/1.001 Hz, and 60 Hz for some source formats. The use of double-rate sampling frequencies is allowed within this standard as a specified extension. The effect is a doubling of the number of line-channels per second and there is no effect on the data structure w
33、ithin each line-channel save doubling of the clock rates. This is a significant extension of the source format capability and only specified equipment may support this operation. Users are cautioned to check whether double clock rate is supported by the HD-SDI infrastructure and the HD-SDTI decoder.
34、 4 Header data specifications For each line-channel carrying an HD-SDTI payload, HD-SDTI header data shall be encapsulated by an ancillary data packet conforming to a SMPTE 291M ancillary data packet structure (type 2) as shown in table 2. Table 2 HD-SDTI ancillary data packet structure Name Acronym
35、 Value Ancillary data flag (10-bit words) ADF 000h, 3FFh, 3FFhData identification DID 40hSecondary data identification SDID 02hData count DC 2AhHD-SDTI header data 42 words Check sum CS The total size of the ancillary data packet shall be 49 words of which the HD-SDTI header data comprises the 42 wo
36、rds as shown in table 3. The structure of the HD-SDTI header data packet is further described in figure 3. Table 3 HD-SDTI header data Name Word length Code and AAI 1 word Destination address 16 words Source address 16 words Block type 1 word CRC flag 1 word Data extension flag 1 word Reserved data
37、4 words Header CRC 2 words SMPTE 348M-2005 Page 6 of 13 pages ADF (3W)SDIDData Count AAI & CodeDestinationAddressSourceAddressBlock TypeCRC FlagData Ext FlagReserved(4 words)HeaderCRC (2W)Check SumDIDHD-SDTI Header Data Ancillary PacketHD-SDTI Header Data000h 3FFh 3FFh 140h 102h 22EhEAV (3W)CRCLNFig
38、ure 3 Header data structure HD-SDTI header data shall be located immediately after the EAV/LN/CRC sequence as shown in figure 3 on lines specified in the application document. In the special case of HD-SDTI applications which embed digital audio according to SMPTE 299M, the HD-SDTI header data packe
39、ts shall be placed immediately following any such SMPTE 299M ancillary data packets. For line-channels which do not carry an HD-SDTI payload, the “block type” (section 4.4) shall be set to a value of “00h” to indicate a null payload. (plus definition of other header data). All data in the HD-SDTI he
40、ader data shall use 8-bit words using bits B0 to B7 of each word. For all words of the HD-SDTI header data, bit B8 shall be the even parity of bits B0 to B7 and bit B9 shall be the complement of bit B8. 4.1 Ancillary data formatting The ADF, DID, SDID, DC and CS data words shall conform to SMPTE 291
41、M. All data in the ancillary packet following the ADF shall be 8 bit words where the word value is defined by bits B7 through B0. Bit B8 is even parity of bits B7 through B0 and bit B9 is the complement of bit B8. 4.1.1 Data ID (DID) The data ID shall have the value 40hfor bits B7 through B0. 4.1.2
42、Secondary data ID (SDID) The secondary data ID shall have the value 02hfor bits B7 through B0. 4.1.3 Data count (DC) The data count shall represent 42 words for the header and have the value 2Ahfor bits B7 through B0. 4.2 AAI (Authorized address identifier) and code Both AAI and code shall consist o
43、f 4 bits (see figure 4). AAI shall comprise bits B7 to B4. Code shall comprise bits B3 to B0. SMPTE 348M-2005 Page 7 of 13 pages B7B6B5B4B3B2B1B0AAICodeFigure 4 Assignment of AAI and code bits 4.2.1 AAI The AAI shall identify the format of both the destination and source address words from one of 16
44、 different states. Table 4 Assignment of payload size Address identification B7 B6 B5 B4 Unspecified format 0 0 0 0 IP-v6 addressing 0 0 0 1 The value 0h is reserved for applications where no source and destination address format is specified. In this case, any non-zero value in the source and desti
45、nation address shall be ignored. 4.2.2 Code “Code” shall identify the length of the payload which shall be contained in the area between the SAV and EAV timing reference points. Table 5 Assignment of payload size Payload Bits: B3 B2 B1 B0 SDI 0 0 0 0 1440 words 0 0 0 1 1920 words 0 0 1 0 1280 words
46、0 0 1 1 Reserved for 143Mb/s applications 1 0 0 0 2304 words (extension mode) 1 0 0 1 2400 words (extension mode) 1 0 1 0 1440 words (extension mode) 1 0 1 1 1728 words (extension mode) 1 1 0 0 2880 words (extension mode) 1 1 0 1 3456 words (extension mode) 1 1 1 0 3600 words (extension mode) 1 1 1
47、1 Reserved but not defined All other codes The value 0h is reserved to carry a line of SDI signal in the digital active line area. SMPTE 348M-2005 Page 8 of 13 pages The code values higher than 8h shall only be used if the HD-SDTI is being used in extended mode with support for advanced SAV position
48、ing as detailed in table 1. 4.3 Destination and source address The destination and source address represents the address of the devices within the connection according to the AAI. Sixteen bytes are allocated for both destination and source address with the bit allocation for each address as shown in
49、 figure 5. A7A6A5A4A3A2A1A0A15A14A13A12A11A10A9A8A23A22A21A20A19A18A17A16A127A126A125A124A123A122A121A120A31A30A29A28A27A26A25A24A39A38A37A36A35A34A33A32A47A46A45A44A43A42A41A40A55A54A53A52A51A50A49A48A63A62A61A60A59A58A57A56A71A70A69A68A67A66A65A64A79A78A77A76A75A74A73A72A87A86A85A84A83A82A81A80A95A94A93A92A91A90A89A88A103A102A101A100A99A98A97A96A111A110A109A108A107A106A105A104A119A118A117A116A115A114A113A112Figure 5 Assignment of bits for the source and destination addresses The default condition when no destinati
