Texas Instruments TVP5151 User manual

Application Report
SLEA103–July 2010
TVP5151 VBI Quick Start
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ABSTRACT
The TVP5151 video decoder has an internal vertical data processor (VDP) that can be used to slice
various VBI data services such as V-Chip, Teletext (WST, NABTS), closed captioning (CC), wide screen
signaling (WSS), copy generation management system (CGMS), video program system (VPS), electronic
program guide (EPG or Gemstar), program delivery control (PDC) and vertical interval time code (VITC).
This application report provides an introduction to the VBI data slicing capabilities of the TVP5151 and
focuses on configuring the TVP5151 for the more commonly used VBI data services.
Contents
1 Introduction .................................................................................................................. 2
2 VDP Configuration RAM ................................................................................................... 4
3 Line Mode Registers ........................................................................................................ 6
4 Sliced Data Retrieval ....................................................................................................... 7
5 Managing Data Retrieval ................................................................................................... 7
6 FIFO Access ................................................................................................................. 8
7 Ancillary Data ................................................................................................................ 9
8 Full-Field Mode ............................................................................................................ 10
9 VBI Raw Data Mode ...................................................................................................... 10
Appendix A Subset of the TVP5151 VDP I2C Registers ................................................................... 12
Appendix B Sample WinVCC CMD File for VBI Setup ..................................................................... 20
Appendix C Example TVP5151 C Code ..................................................................................... 21
Appendix D VBI Raw Data I2C Registers .................................................................................... 22
List of Figures
1 The VDP Configuration RAM is Loaded Prior to Line Mode Register Setup ....................................... 3
2 Example Load of WSS/CGMS Configuration RAM..................................................................... 5
3 Line Mode Setup for WSS/CGMS ........................................................................................ 6
4 Example WSS/CGMS Data Retrieval .................................................................................... 7
5 Line 21 Closed Caption ITU-R BT.656 Digital Output Capture with YUV Samples Present Raw Data
Mode Disabled............................................................................................................. 11
6 Line 21 Closed Caption ITU-R BT.656 Digital Output Capture in Raw Data Mode UV (Chroma) Data are
Replaced with Y (Luma) Data ........................................................................................... 11
List of Tables
1 Supported Data Services .................................................................................................. 2
2 Configuration RAM Recommended Settings............................................................................ 4
3 Line Mode Configuration Bits for Supported Modes.................................................................... 6
4 Dedicated VDP Data Registers ........................................................................................... 7
5 Ancillary Data Header ...................................................................................................... 9
6 525-Line Raw Data Setup to Include Line 21.......................................................................... 10
7 625-Line Raw Data Setup................................................................................................ 10
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Introduction www.ti.com
1 Introduction
The TVP5151 video decoder has an internal Vertical Data Processor (VDP) that can be used to slice
various VBI data services such as V-Chip, Teletext (WST, NABTS), Closed Captioning (CC), Wide Screen
Signaling (WSS), Copy Generation Management System (CGMS), Video Program System (VPS),
Electronic Program Guide (EPG or Gemstar), Program Delivery Control (PDC), and Vertical Interval Time
Code (VITC). These data services are typically transmitted during the vertical blanking interval of the video
frame. Table 1 provides a summary of the supported data services including the line numbers on which
they are typically transmitted.
Table 1. Supported Data Services
VBI System Standard Line Number Number of Bytes Specification
Teletext WST A SECAM 6-23 (field 1, 2) 38 ITU-R BT 653-3
Teletext WST B PAL 6-22 (field 1, 2) 43 ITU-R BT 653-3
Teletext NABTS C NTSC-M 10-21 (field 1, 2) 34 ITU-R BT 653-3
Teletext NABTS D NTSC-J 10-21 (field 1, 2) 35 ITU-R BT 653-3
Closed Caption PAL 22 (field 1, 2) 2 EIA-608-D
Closed Caption NTSC 21 (field 1, 2) 2 EIA-608-D
WSS/CGMS PAL 23 (field 1, 2) 14 bits ITU-R BT 1119-1
WSS/CGMS NTSC 20 (field 1, 2) 20 bits IEC 61880
VITC PAL 6-22 9 SMPTE 12M-1999
VITC NTSC 10-20 9 SMPTE 12M-1999
VPS (PDC) PAL 16 13 ETS 300 231
V-ChiP NTSC 21 (field 2) 2 EIA-744-A
Gemstar 1x NTSC 2
Gemstar 2x NTSC 5 with frame byte
User Any Programmable Programmable
A host or backend receiver can retrieve the sliced data using one of three methods:
• I2C access of dedicated Closed Caption, WSS, CGMS, VPS, Gemstar, VITC, and V-Chip data
registers.
• I2C access of an internal 512-byte FIFO used primarily for high-bandwidth data services such as
full-field teletext.
• As ITU-R BT.656 ancillary data, inserted by the TVP5151 in the data stream during the horizontal
blanking interval.
Note: This document will focus primarily on the more commonly used dedicated I2C data registers.
Prior to accessing the VBI sliced data, the TVP5151 must be configured for the desired VBI data service.
This includes loading of the VDP Configuration RAM (C-RAM) and the Line Mode registers that are used
to enable various data services. Detailed descriptions of the VBI related I2C registers are shown in
Appendix A.
2TVP5151 VBI Quick Start SLEA103–July 2010
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www.ti.com Introduction
Figure 1. The VDP Configuration RAM is Loaded Prior to Line Mode Register Setup
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VDP Configuration RAM www.ti.com
2 VDP Configuration RAM
The first step in configuring the TVP5151 for VBI data slicing is to load the VDP Configuration RAM
(C-RAM). The C-RAM defines the data slicing modes for the various data services, with each mode
having its own unique RAM address and 16 byte block of memory. Table 2 shows the recommended
setup values for the various data services that are supported. Prior to loading the C-RAM, the Line Mode
registers must all be programmed with a value of FFh to avoid conflict between the VDP and
microprocessor during the load process. Full field mode must also be disabled in I2C register CFh.
Table 2. Configuration RAM Recommended Settings
Index Address 0 1 2 3 4 5 6 7 8 9 A B C D E F
Reserved 000h Reserved
WST SECAM 010h AA AA FF FF E7 2E 20 A6 E4 B4 OE 0 7 0 10 0
Reserved 020h Reserved
WST PAL B 030h AA AA FF FF 27 2E 20 AB A4 72 10 0 7 0 10 0
Reserved 040h Reserved
WST PAL C 050h AA AA FF FF E7 2E 20 22 A4 98 0D 0 0 0 10 0
Reserved 060h Reserved
WST NTSC 070h AA AA FF FF 27 2E 20 23 63 93 0D 0 0 0 10 0
Reserved 080h Reserved
NABTS, NTSC 090h AA AA FF FF E7 2E 20 A2 63 93 0D 0 7 0 15 0
Reserved 0A0h Reserved
NABTS, NTSC-J 0B0h AA AA FF FF A7 2E 20 A3 63 93 0D 0 7 0 10 0
Reserved 0C0h Reserved
CC, PAL/SECAM 0D0h AA 2A FF 3F 04 51 6E 02 A4 7B 09 0 0 0 27 0
Reserved 0E0h Reserved
CC, NTSC 0F0h AA 2A FF 3F 04 51 6E 02 63 8C 09 0 0 0 27 0
Reserved 100h Reserved
WSS/CGMS, PAL/SECAM 110h 5B 55 C5 FF 0 71 6E 42 A4 CD 0F 0 0 0 3A 0
Reserved 120h Reserved
WSS/CGMS, NTSC C 130h 38 0 3F 0 0 71 6E 43 63 7C 08 0 0 0 39 0
Reserved 140h Reserved
VITC, PAL/SECAM 150h 0 0 0 0 0 8F 6D 49 A4 85 08 0 0 0 4C 0
Reserved 160h Reserved
VITC, NTSC 170h 0 0 0 0 0 8F 6D 49 63 94 08 0 0 0 4C 0
Reserved 180h Reserved
VPS, PAL 190h AA AA FF FF BA CE 2B 8D A4 DA 0B 0 7 0 60 0
Reserved 1A0h Reserved
Gemstar Custom 1 1B0h 99 99 FF FF 05 51 6E 05 63 18 13 80 0 0 60 0
The C-RAM is accessed through the use of three I2C registers (C3h-C5h). Registers C4h and C5h must
be programmed with the 9-bit starting address of the block of C-RAM to be programmed. I2C read and
write operations are then performed indirectly using register C3h. The C-RAM address is automatically
incremented following each I2C transaction. Only the portion of the C-RAM that includes the data service
to be used needs to be programmed. If WSS/CGMS for NTSC is the only desired data service, for
example, only the 16 bytes starting at C-RAM address 130h need to be programmed. Figure 2 shows
example C code for loading the WSS/CGMS C-RAM.
4TVP5151 VBI Quick Start SLEA103–July 2010
Copyright © 2010, Texas Instruments Incorporated

// TVP5151 NTSC WSS/CGMS C-RAM Load Example
#define TVP5151 0xB8; // TVP5151 main I2C address
byte I2C_Data;
int CRAM_Address, count;
byte I2CData ={0x14,0x02};
// recommended WSS/CGMS settings
byte WSS_ARRAY[]={0x38,0,0x3F,0,0,0x71,0x6E,0x43,0x63,0x7C,0x08,0,0,0,0x39,0};
I2C_RegAddress = 0xD0; // starting address of Line Mode registers
I2C_Data = 0xFF;
For (count = 0; count < 44; count ++)
{
I2CWriteByte(TVP5151, I2C_RegAddress, I2C_Data); //write FFh to Line Mode registers
I2C_RegAddress ++;
}
I2CWriteByte(TVP5151, 0xCF, 0); // disable full field mode
CRAM_Address = 0x130; // address of NTSC WSS/CGMS C-RAM block
I2CWriteByte(TVP5151, 0xC4, 0x30); // load C4h with C-RAM address[7:0]
I2CWriteByte(TVP5151, 0xC5, 0x01); // load C5h with C-RAM address[8]
For (count = 0; count < 16; count++)
{
I2CWriteByte(TVP5151, 0xC3, WSS_ARRAY[count]); // write 16 bytes of WSS/CGMS C-RAM
} // data to register C3h.
www.ti.com VDP Configuration RAM
Configuration RAM I2C Access Registers
Address C3h-C5h
Address 7 6 5 4 3 2 1 0
C3h Configuration data
C4h RAM address [7:0]
C5h Reserved RAM
address 8
Example: (Write 2 data bytes starting at C-RAM address 130h)
1. Set C-RAM starting address.
(a) Write 30h to register C4h (C-RAM address [7:0]).
(b) Write 01h to register C5h (C-RAM address [8]).
2. Write the two bytes (38h and 00h)
(a) Write 38h to register C3h. Write first byte to C-RAM address 130h.
(b) Write 00h to register C3h. Write next byte to C-RAM address 131h.
Figure 2. Example Load of WSS/CGMS Configuration RAM
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// Example C Code for setting up WSS/CGMS Line Mode Registers
//
// Load C-RAM
//
// NTSC WSS/CGMS Line Mode setup for line 20 of both fields
I2CWriteByte(TVP5151, 0xEC, 0x09); // line 20 field 1 (0xEC), mode bits = 0x09
I2CWriteByte(TVP5151, 0xED, 0x09); // line 20 field 2 (0xED), mode bits = 0x09
I2CWriteByte(TVP5151, 0xCB, 0x4E); // Set Pixel Alignment [7:0]to 0x4E
I2CWriteByte(TVP5151, 0xCC, 0x00); // Set Pixel Alignment [9:8]to 0x00
// PAL WSS/CGMS Line Mode setup for line 23 (source input) of both fields.
// PAL line numbering has 3 line offset so the Line 26 line mode registers are used.
I2CWriteByte(TVP5151, 0xF8, 0x08); // line 26 field 1 (0xF8), mode bits = 0x08
I2CWriteByte(TVP5151, 0xF9, 0x08); // line 26 field 2 (0xF9), mode bits = 0x08
I2CWriteByte(TVP5151, 0xCB, 0x4E); // Set Pixel Alignment [7:0]to 0x4E
I2CWriteByte(TVP5151, 0xCC, 0x00); // Set Pixel Alignment [9:8]to 0x00
Line Mode Registers www.ti.com
3 Line Mode Registers
After the VDP Configuration RAM is loaded, the Line Mode Registers (D0h-FBh) must be properly
configured for the desired VBI data service. Each register in this register bank is linked to a specific video
line number and video field. Video lines 6 through 27 of both Field 1 and Field 2 are supported. For each
desired data service, the proper mode configuration bits need to be loaded into the line mode register that
is linked to the correct video line number. Additional data slicing options such as filtering, error correction,
and FIFO routing are also available in the line mode registers. Unused line mode and line address
registers must be programmed with FFh. A detailed description of these registers is shown in Appendix A.
The TVP5151 VDP is based on an NTSC line numbering convention, resulting in a 3-line VDP offset
relative to actual PAL line numbers. For PAL systems, the Line Mode register for line “N+3” must be used
to configure a data service transmitted on line N of the input source. Figure 3 shows example C code for
configuring WSS/CGMS data services for NTSC and PAL. Included in this example is an I2C write to the
Pixel Alignment Registers (CBh-CCh), which define the horizontal position where data slicing begins. The
value used (4Eh) is recommended for all data services.
Table 3. Line Mode Configuration Bits for Supported Modes
Line Mode Register Name Video Line Number Description
(D0h-FCh) Bits [3:0]
0000b WST SECAM 6-23 (field 1, 2) Teletext, SECAM
0001b WST PAL B 6-22 (field 1, 2) Teletext, PAL, System B
0010b WST PAL C 6-22 (field 1, 2) Teletext, PAL, System C
0011b WST, NTSC B 10-21 (field 1, 2) Teletext, NTSC, System B
0100b NABTS, NTSC C 10-21 (field 1, 2) Teletext, NTSC, System C
0101b NABTS, NTSC D 10-21 (field 1, 2) Teletext, NTSC, System D (Japan)
0110b CC, PAL/SECAM 22 (field 1, 2) Closed caption PAL/SECAM
0111b CC, NTSC 21 (field 1, 2) Closed caption NTSC
1000b WSS/CGMS, PAL/SECAM 23 (field 1, 2) Wide-screen signal, PAL/SECAM
1001b WSS/CGMS, NTSC 20 (field 1, 2) Wide-screen signal, NTSC
1010b VITC, PAL/SECAM 6-22 Vertical interval timecode, PAL/SECAM
1011b VITC, NTSC 10-20 Vertical interval timecode, NTSC
1100b VPS, PAL 16 Video program system, PAL
1101b EPG/Gemstar Electronic program guide - Custom mode
1110b x x Reserved
1111b Active Video Active Video Active video/full field
Figure 3. Line Mode Setup for WSS/CGMS
6TVP5151 VBI Quick Start SLEA103–July 2010
Copyright © 2010, Texas Instruments Incorporated

// Example C Code for WSS/CGMS NTSC Sliced Data Read
// Load C-RAM
// Configure Line Mode Registers
byte Status;
byte WSSData[3];
I2CReadBuffer(TVP5151,0xC6,&Status,1); //read 1 byte(status)from register C6h
if ((Status & 0x20) == 1)
{
I2CReadBuffer(TVP5151,0x94,&WSSData[0],3); // if WSS/CGMS bit set,
// read the 3 WSS/CGMS bytes
// at WSS/CGMS data registers 94h–96h.
I2CWriteByte(TVP5151,0xC6,0x20); // clear WSS/CGMS available status bit
}
www.ti.com Sliced Data Retrieval
4 Sliced Data Retrieval
The TVP5151 provides dedicated I2C registers (see Table 4) for the retrieval of sliced data. Due to higher
bandwidth requirements, teletext data is stored in a 512-byte FIFO. With all other data services, sliced
data can be automatically sent to the dedicated registers or to the FIFO depending on the line mode
setup. The WSS/CGMS example in Figure 3 results in WSS/CGMS data being routed to the dedicated
WSS/CGMS data registers.
Table 4. Dedicated VDP Data Registers
Register Name I2C Address
VDP Closed Caption Data (field 1) 90h - 91h
VDP Closed Caption Data (field 2) 92h - 93h
VDP WSS/CGMS Data (field 1) 94h - 96h
VDP WSS/CGMS Data (field 2) 97h - 99h
VDP VPS (PAL) /Gemstar 2x (NTSC) Data 9Ah - A6h
VDP VITC Data A7h - AFh
The internal 512-byte FIFO is used primarily for high-bandwidth teletext acquisition but can also be used
for capture of the other data services if enable in the Line Mode register. A header containing information
about the sliced data precedes all sliced data that is routed to the FIFO. The FIFO can be directly
accessed by the host at I2C address B0h. Bit 0 of the FIFO output control register (CDh) must be set to a
logic1 to enable host access to the FIFO.
5 Managing Data Retrieval
The VDP Status Registers (C6h) can be used to determine if sliced data is available. Unmasked data
available bits for the supported data services are available in this register.
VDP Status Register
Address C6h
76543210
FIFO full error FIFO empty TTX available CC field 1 CC field 2 WSS/CGMS VPS/Gemstar VITC available
available available available 2x available
A logic 1 indicates that sliced data is available. Once set, these bits need to be cleared after data retrieval. Writing a 1 to the appropriate
bit(s) in this register clears the status bit. Figure 4 shows an example WSS/CGMS data retrieval.
Figure 4. Example WSS/CGMS Data Retrieval
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FIFO Access www.ti.com
6 FIFO Access
The internal 512-byte FIFO is used primarily for high-bandwidth teletext acquisition but can also be used
for capture of the other data services. The FIFO can be directly accessed by the host at I2C address B0h.
Bit 0 of the VDP FIFO output control register (CDh) must be set to logic 1 to enable host access to the
FIFO. A header containing information about the sliced data precedes all sliced data that is routed to the
FIFO. A VDP FIFO Interrupt threshold register (C8h), FIFO word count register (C7h), and FIFO full/empty
status bits (C6h) are available for managing FIFO data flow.
8TVP5151 VBI Quick Start SLEA103–July 2010
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www.ti.com Ancillary Data
7 Ancillary Data
An option is available to enable transmission of sliced VBI data as ancillary data in the ITU-R BT.656
video data stream. In this mode, the sliced data is inserted on the Y[7:0] output terminals during the
horizontal blanking interval. An 8-byte header containing information about the sliced data is also inserted
in the data stream prior to the sliced data. The header includes a 00h, FFh, FFh preamble that identifies
the data as VBI ancillary data, so the host or backend must be able to distinguish between this preamble
and the ITU-R BT.656 embedded sync codes (FFh, 00h, 00h, E/SAV). The first header byte is inserted
immediately following the EAV code during the horizontal blanking interval of the digital line where it
occurred. The ancillary data header is summarized in Table 5.
The ancillary data mode is enabled by setting bit 6 in the appropriate line-mode register to a logic 1 and
the host-access enable bit (bit 0) in register CDh to a logic 0. When the ancillary data mode is enabled in
register CDh, sliced data is not routed to the internal 512-byte FIFO.
Table 5. Ancillary Data Header
Byte D7 D0
D6 D5 D4 D3 D2 D1 Description
No. (MSB) (LSB)
000000000
1 1 1 1 1 1 1 1 1 Ancillary data preamble
211111111
3 NEP EP 0 1 0 DID2 DID1 DID0 Data ID (DID)
4 NEP EP F5 F4 F3 F2 F1 F0 Secondary data ID (SDID)
5 NEP EP N5 N4 N3 N2 N1 N0 Number of 32 bit data (NN)
6 Video line # [7:0] Internal Data ID0 (IDID0)
7 0 0 0 Data error Match #1 Match #2 Video Line # [9:8] Internal Data ID1 (IDID1)
8 1. Data Data byte 1st word
9 2. Data Data byte
10 3. Data Data byte
11 4. Data Data byte
... ... ...
m-1. Data Data byte Nth word
m. Data Data byte
CS [7:0] Checksum
4N + 7 0 0 0 0 0 0 0 0 Fill byte
EP: Even parity for D0-D5
NEP: Negate even parity
DID: 91h: Sliced data from the vertical blanking interval of first field
53h: Sliced data from outside of the vertical blanking interval of first field
55h: Sliced data from the vertical blanking interval of second field
97h: Sliced data from outside of the vertical blanking interval of second field
SDID: This field holds the data format taken from the line-mode register of the corresponding line.
NN: Number of Dwords beginning with byte 8 through 4N+7. Note that each Dword is 4 bytes.
IDID0: Transaction video line number [7:0]
IDID1: Bit 0/1: Transaction video line number [9:8].
Bit 2: Match 2 flag.
Bit 3: Match 1 flag.
Bit 4: Value = 1 if a single error was detected in the EDC block. Value = 0 if no error was detected.
CS: Sum of D0-D7 of 1.Data through last data byte.
Fill byte: Fill byte makes a multiple of 4 bytes from byte zero to last fill byte.
Note: The number of bytes (m) varies depending on the VBI data service.
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Full-Field Mode www.ti.com
8 Full-Field Mode
Some teletext services transmit data on multiple video lines occurring anywhere in the video field. The
TVP5151 provides a full-field mode which arms VDP slicing for all lines in the video field. When full-field
mode is enabled, all video lines excluding those defined in the line-mode registers are sliced as specified
in the VDP full-field mode register (FCh). The full-field mode register uses the same mode configuration
format as the line-mode registers. Full-field mode is enabled by setting the full-field enable bit in register
CFh to a logic 1. Sliced data is then retrieved by I2C FIFO access or as ancillary data in the ITU-R BT.656
data stream.
9 VBI Raw Data Mode
The TVP5151 offers a VBI raw data mode for use in systems where VBI data slicing and processing is
handled in the digital backend receiver instead of the video decoder. In this mode of operation, the
decoders are configured to output raw 2x over-sampled luma data on the ITU-R BT.656 output during the
defined VBLK (vertical blanking) interval. The raw, un-sliced A/D video data is transmitted during the
active video portion of the line with chroma samples being replaced with the luma samples.
The default VBLK interval for Field 1 is defined as lines 1 through 20 for 525-line video formats and lines
623 through 23 for 625-line video formats. This interval may be adjusted to include additional lines.
Support for NTSC line 21 closed caption data, for example, requires extension of the VBLK interval to
include line 21.
The default VBLK interval for the TVP5151 is defined as lines 1 through 20 for 525-line video formats and
lines 623 through 23 for 625-line formats. The TVP5151 VBLK interval can be adjusted with the VBLK
Start and Stop registers (18h-19h). The TVP5151 VBLK Start and Stop registers provide relative
adjustments to the default VBLK interval. After configuring the desire VBLK interval, the Luma bypass (bit
4) in the Luminance Processing Control #1 register (07h) must be set to a logic 1 to enable raw data
output. Table 6 shows the default I2C registers with a modified VBLK interval for Line 21 inclusion, while
Table 7 shows the default 625-line setup. Also shown in Figure 5 and Figure 6 are digital captures of the
TVP5151 ITU-R BT.656 output for comparison of normal operation and raw data operation. Insertion of a
4-byte preamble (00h FFh FFh 60h) prior to the start of the raw data is optional in I2C register 07h.
Table 6. 525-Line Raw Data Setup to Include Line 21
I2C Subaddress Default I2C Data Description
07h 00h 10h Enable raw data (Luma bypass) and Preamble
18h 00h 00h VBLK Start = default line 1
19h 00h 01h VBLK Stop = default +1 to include line 21
Table 7. 625-Line Raw Data Setup
I2C Subaddress Default I2C Data Description
07h 00h 10h Enable raw data (Luma bypass) and Preamble
18h 00h 00h VBLK Start LSB = default line 623
19h 00h 00h VBLK Stop = default
Note: Detailed descriptions of the TVP5151 I2C registers related to VBI Raw Data Mode are shown in
Appendix A.
Example (set up NTSC for raw data on lines 1 through 21)
1. Set up VBLK interval.
• Write 01h to register 19h to include line 21.
2. Enable Raw Data Mode
• Write 10h to register 07h to enable raw data mode.
10 TVP5151 VBI Quick Start SLEA103–July 2010
Copyright © 2010, Texas Instruments Incorporated