Texas Instruments TVP5154A, Быстрый старт

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Introduction
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1 Introduction
The TVP5154A 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:
•
I
2
C access of dedicated Closed Caption, WSS, CGMS, VPS, Gemstar, VITC, and V-Chip data
registers.
• I
2
C 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 TVP5154A in the data stream during the horizontal
blanking interval.
Note: This document will focus primarily on the more commonly used dedicated I
2
C data registers.
Prior to accessing the VBI sliced data, the TVP5154A 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 I
2
C registers are shown in
Appendix A .
2 TVP5154A VBI Quick Start SLEA104 – July 2010
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