1、 Table of contents Introduction 1 Scope 2 Normative references 3 Version number 4 General specifications 5 Header data 6 User data signal format 7 EDH Annex A Bibliography Introduction This revision of SMPTE 305.2M is to document format parameters, and to revise normative references cited in previou
2、s revisions. This revision is compatible with previous revisions of the standard. Implementation guidance is given in section 6.2.3 in order to retain interoperability. In table 2 data type 200his now defined as invalid data, previous ambiguity has been removed. This revision does not implement the
3、extended payload feature of previous versions. 1 Scope 1.1 This standard specifies a data stream protocol used to transport packetized data. The data packets and synchronizing signals are only compatible with 10-bit operation of SMPTE 259M (SDI) as shown in figure 1. Parameters of the protocol are c
4、ompatible with the 4:2:2 component SDI format as shown in figure 2. 1.2 The data stream uses the digital television active line for the payload. Ancillary data packets defined by SMPTE 291M in the horizontal blanking interval are used to identify the payload application. 1.3 This standard does not p
5、rovide the specific protocol for the many SDTI data types. Payload data may be organized in fixed length blocks or variable length blocks. Additional documents will describe particular applications of this standard and will include details of data formatting, data location and other parameters, such
6、 as compression and error correction, if applicable. NOTE SMPTE 352M labels are not used for SDTI application of SMPTE 259M. 2 Normative references The following standards contain provisions that, through reference in this text, constitute provisions of this standard. At the time of publication, the
7、 editions indicated were valid. All standards are subject to revision, Page 1 of 18 pagesSMPTE 305M-2005 Revision of SMPTE 305.2M-2000 Copyright 2005 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (914) 761-1100 ApprovedJuly 21, 2005SMPTE STAN
8、DARD for Television Serial Data Transport Interface SMPTE 305M-2005 Page 2 of 18 pages and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of the standards indicated below. ANSI/SMPTE 125M-1995, Television Component Video
9、 Signal 4:2:2- Bit Parallel interface ANSI/SMPTE 267-1995, Television Bit Parallel Digital interface Component Video Signal 4:2:2 16x9 Aspect Ratio SMPTE 259M, Television SDTV Digital Signal/Data Serial Digital Interface SMPTE 291M-1998, Television Ancillary Data Packet and Space Formatting SMPTE 29
10、4M-2001, Television 720x483 Active Line at 59.94-Hz Progressive Scan Production Bit-Serial Interfaces SMPTE RP 165, Error Detection Checkwords and Status Flags for Use in Bit-Serial Digital Interfaces for Television ITU-R BT.601-5 (10/95), Studio Encoding Parameters of Digital Television for Standar
11、d 4:3 and Wide-Screen Aspect Ratios. ITU-R BT.656-4 (02/98), Interfaces for Digital Component Video Signals in 525-Line and 625-Line Television Systems Operating at the 4:2:2 Level of Recommendation of ITU-R BT.601(Part A) ITU-T X.25 (09/98), Interface Between Data Terminal Equipment (DTE) and Data
12、Circuit-Terminating Equipment (DCE) for Terminals Operating in the Packet Mode and Connected to Public Data Networks by Dedicated Circuit 3 Version number The current version number of this standard is version 3. This version is backwards compatible with the previous published version of SMPTE 305.2
13、M-2000 (version 2). See section 6.2.3 for implementation guidance. 4 General specifications Figure 1 System block diagram Clock InputSDI ENCDa ta InputEQ. SDI DECDa ta OutputClock OutputFormatterSMPTE 259M(4:2:2 Component Digital)Deformatter10bits 10bits9bits 9bits10bits/10bitsSMPTE259MClock InputDa
14、 ta InputDa ta OutputClock OutputSMPTE 305M-2005 Page 3 of 18 pages Figure 2 Signal format (1 line) 4.1 As shown in figure 1, packetized payload data of either 8 or 9 bits is mapped into a stream of 10-bit words compatible with the active line area of standard digital television signals. The resulti
15、ng word stream shall be formatted, serialized, scrambled, and coded according to SDI standard SMPTE 259M. 4.2 The signal format for one line is shown in figure 2. Header data is contained in an ancillary data packet as described in section 5. The payload consists of user data and the optional CRC de
16、scribed in section 6. 4.3 The following specifications are required for compliance with the SDI standard: 4.3.1 Formatted data word length shall be 10 bits, B0 through B9. B9 is the most significant bit (MSB). 4.3.2 Timing reference signals, end of active video (EAV) and start of active video (SAV),
17、 shall occur on every line. Their location will depend on the scanning standard associated with the data type selected from table 2. The locations of EAV and SAV shall conform to ANSI/SMPTE 125M, ANSI/SMPTE 267, SMPTE 294M, or ITU-R BT.656 4.4 For data types using SMPTE 294M, only the first 1920 wor
18、ds of the 2160-word active line are used for payload. 4.5 An ANC data packet forming the header data is placed after EAV, as specified in section 5. All payload is placed between the SAV and EAV. The space after the header data but before SAV is available for ANC data as specified by SMPTE 291M. NOT
19、E Some applications may place header data on every line of the relevant SDI interface, regardless if user data are present on the line payload or not. To differentiate such “empty” line from line with user data, the code value of byte 10 of header data is set to 0000h. 5 Header data The data structu
20、re for the header data shall conform to SMPTE 291M ancillary data packet (type 2). The header data, shown in figure 3, shall be located immediately after the EAV on lines specified in the application document for the data type selected from table 2. PayloadEAVSAVAncillary DataHeader DataCRCUser Data
21、1440 words : 270 Mbit/s 1920 words : 360 Mbit/sSMPTE 305M-2005 Page 4 of 18 pages Ancillary data flag (ADF) Data ID (DID) Secondary data ID (SDID) 53 words Data count (DC) Header data 46 words Checksum (CS) The header data shall include the following: Line number (2 words) Line number CRC (2 words)
22、Code and AAI (1 word) Destination address (16 words) Source address (16 words) Block type (1 word) CRC flag (1 word) Reserved data (5 words) Header CRC (2 words) Figure 3 - Header data structure NOTE Byte 43 block type, should be considered as block type (size). 5.1 Ancillary data formatting The ADF
23、, DID, SDID, DC, and CS shall conform to SMPTE 291M. 5.1.1 Data ID (DID) The data ID shall have the value of (40h) for B7 through B0. B8 is even parity for B7 through B0 B9 is the complement of B8 3FF000000XYZ0003FF3FF140EAV ADFLinenumber0Linenumber1LinenumberCRC0LinenumberCRC10356Code&AAI810 27 443
24、DIDCo deDestinationAddress(16 words)SourceAddress(16words)ReservedReservedReservedReservedReserved0123HeaderCRC0HeaderCRC1CheckSum50BlocktypeHeader Data Packet (53 words)CRCflagData count5211 44 4522E101SMPTE 305M-2005 Page 5 of 18 pages 5.1.2 Secondary data ID (SDID) The secondary data ID shall hav
25、e the value of (01h) for B7 through B0. B8 is even parity for B7 through B0 B9 is the complement of B8 5.1.3 Data count (DC) The data count shall specify 46 words for the header with the value (2Eh) for B7 through B0. B8 is even parity for B7 through B0 B9 is the complement of B8 5.2 Line number 5.2
26、.1 The line number shall represent the number from 1 through 525 for 525 systems, and 1 through 625 for 625 systems in order to check the data continuity. The line numbering is defined in SMPTE 125M and ITU-R BT.601. 5.2.2 The line number shall be contained within L9 through L0. R5 through R0 are re
27、served and set to zero (see figure 4). EP1 is even parity for L7 through L0 EP2 is even parity for R5 through R0, L9, L8 5.3 Line number CRC Following each line number, a line number CRC shall be inserted. The line number CRC applies to the data ID through the line number for the entire ten bits (se
28、e figure 5). The generator polynomial for the line number CRC shall be G(X) = X18+ X5+ X4+ 1, which conforms to ITU-T X.25 (see figure 6). Line number CRC shall be contained in C17 through C0, and the initial value shall be set to all ones. 5.4 Code and AAI (Authorized address identifier) Both code
29、and AAI shall consist of four bits (see figure 7). Code: B3 through B0 AAI: B7 through B4 B8 is even parity for B7 through B0 B9 is the complement of B8 5.4.1 Code The code is intended to identify the length of the payload with the following values. The payload shall be contained in the area between
30、 SAV and EAV. Description B3 B2 B1 B0 Reserved for SDI: 1440 word payload: 1920 word payload: 0 0 0 0 0 0 0 0 1 0 1 0 SMPTE 305M-2005 Page 6 of 18 pages NOTES 1 Code = 0000 is used where uncompressed 4:2:2 data are transmitted in the line containing the header. However, uncompressed video signals an
31、d compressed video signals should not be mixed in the same line or block. 2 Code = 1000 is reserved for 143 Mb/s applications. 5.4.2 AAI The AAI specifies the format of the destination and source address words. Description B7 B6 B5 B4 Unspecified format: IPv6 address: 0 0 0 0 0 0 0 1 The value (0h)
32、is reserved for applications where no source and destination address format is specified. Figure 4 Line number Figure 5 Line number CRC SMPTE 305M-2005 Page 7 of 18 pages Figure 6 Generator polynomial Figure 7 Code and AAI 5.5 Destination and source address The destination and source address represe
33、nts the address of the devices within the connection according to the AAI. Sixteen bytes are allocated for both destination and source address with the following structure (see figure 8): Address: B7 through B0 B8 is even parity for B7 through B0 B9 is the complement of B8 When all 16 bytes of the d
34、estination address are zero filled in accordance with AAI = 0000, it shall indicate the universal address to all devices connected to the interface. The default condition when no destination and source address is required is that all 16 bytes of each the destination and source address shall be set t
35、o zero in accordance with AAI = 0000. B0_EPB1B2B3B4B5B6B7B8B9EPAAICo deC 1 7 C 1 6 C 1 5 C 1 4 C 1 3 C 1 2 C 1 1 C 1 0 C 9 C 8 C 7 C 6 C 5 C 4 C 3 C 2 C 1 C 0 Serial data in (LSB first) + + + SMPTE 305M-2005 Page 8 of 18 pages Figure 8 Source and destination address 5.6 Block type (size) The block t
36、ype (byte 43) shall consist of one word and is intended to indicate the segmentation of the payload. Either fixed block size or variable block size may be selected. B7 or B6 is the prefix to define the fixed block data structure as follows: B7 B6 Fixed block size without ECC: 0 0 Fixed block size wi
37、th ECC: 0 1 Unassigned: 1 0 Reserved (*): 1 1 *The reserved prefix (B7, B6) = (1, 1) can only be used with the variable block size whose value is (01h) for B5 through B0. NOTE Error correction codes (ECC) will be determined individually in accordance with the application document for the data type s
38、elected in table 2. 5.6.1 Fixed block size The block type segmentation word for the fixed block size is indicated by setting b7 and b6 according to section 5.6, and the values for B5 through B0 are shown in table 1. Each data packet (data type + data block) shall be placed one right after the other.
39、 B8 is even parity for B7 through B0 B9 is the complement of B8 _ EPB0B1B8A0B9A1A2A3A4A5A6A7A8A9A10A11A12A13A14A15_EPA16A17A18A19A20A21A22A23A24A25A26A27A28A29A30A31EPB2B3B4B5B6B7A32A33A34A35A36A37A38A39A40A41A42A43A44A45A46A47A48A49A50A51A52A53A54A55A56A57A58A59A60A61A62A63A64A65A66A67A68A69A70A711
40、0 2345 67891011A72A73A74A75A76A77A78A79A80A81A82A83A84A85A86A87A88A89A90A91A92A93A94A95A96A97A98A99A100A101A102A10312A104A105A106A107A108A109A110A11113 14A112A113A114A115A116A117A118A119A120A121A122A123A124A125A126A12715_EPEP_EPEP_EPEP_EPEP_EPEP_EPEP_EPEP_EPEP_EPEP_EPEP_EPEP_EPEP_EPEP_EPEP_EPEPSMPTE
41、 305M-2005 Page 9 of 18 pages 5.6.2 Variable block size The block type segmentation word for the variable block size shall have the following value: B7 B6 B5 B4 B3 B2 B1 B0 Variable block size: 1 1 0 0 0 0 0 1 B8 is even parity for B7 through B0 B9 is the complement of B8 With the variable block siz
42、e, any size of consecutive block data words is permitted. The next data packet can be either placed immediately after the other, or on the next line. For block lengths exceeding the payload of one line, fields “code and AAI“ through data “reserved 0“, within the header data, shall be repeated for ea
43、ch line that carries part of the block. 5.7 Payload CRC flag The payload CRC flag shall consist of one word. The payload CRC flag is intended to indicate the presence of the payload CRC with the following values: B7 through B0 (00h): The CRC shall not be inserted at the end of the payload, the space
44、 may be used for data. (01h): The CRC shall be inserted at the end of the payload. (02h) - (FFh): Reserved B8 is even parity for B7 through B0 B9 is the complement of B8. SMPTE 305M-2005 Page 10 of 18 pages Table 1 Fixed block size Block type (B5-B0) Block size 270 Mb/s 360 Mb/s 01h1438 (1437) words
45、 1 block 1 block 02h719 (718) words 2 blocks 2 blocks 03h479 (478) words 3 blocks 4 blocks 04h359 (358) words 4 blocks 5 blocks 09h1918 (1917) words - 1 block 0Ah959 (958) words 1 block 2 blocks 0Bh639 (638) words 2 blocks 3 blocks 11h766 (765) words 1 block 2 blocks 12h383 (382) words 3 blocks 5 bl
46、ocks 13h255 (254) words 5 blocks 7 blocks 14h191 (190) words 7 blocks 10 blocks 21h5 (4) words 287 blocks 383 blocks 22h9 (8) words 159 blocks 213 blocks 23h13 (12) words 110 blocks 147 blocks 24h17 (16) words 84 blocks 112 blocks 25h33 (32) words 43 blocks 58 blocks 26h49 (48) words 29 blocks 39 bl
47、ocks 27h65 (64) words 22 blocks 29 blocks 28h97 (96) words 14 blocks 19 blocks 29h129 (128) words 11 blocks 14 blocks 2Ah193 (192) words 7 blocks 9 blocks 2Bh257 (256) words 5 blocks 7 blocks 2Ch385 (384) words 3 blocks 4 blocks 2Dh513 (512) words 2 blocks 3 blocks 2Eh609 (608) words 2 blocks 3 bloc
48、ks 31h62 (61) words 23 blocks 30 blocks 32h153 (152) words 9 blocks 12 blocks 33h171 (170) words 8 blocks 11 blocks 34h177 (176) words 8 blocks 10 blocks 35h199 (198) words 7 blocks 9 blocks 36h256 (255) words 5 blocks 7 blocks 37h144 (143) words 10 blocks 13 blocks 38h160 (159) words 9 blocks 12 bl
49、ocks NOTE The values in parenthesis are the size of the data block because the first word is used for “type“. 5.8 Header expansion reserved data The header expansion reserved data (5 words) shall be positioned after the CRC flag. The default value for the reserved data is (200h). SMPTE 305M-2005 Page 11 of 18 pages 5.9 Header CRC Following each ancillary data header, the header CRC shall be inserte
