Datasheet

TVP5146M2
SLES141H –JULY 2005– REVISED FEBRUARY 2012 www.ti.com
2.6.4 I
2
C Timing Requirements
The TVP5146M2 decoder requires delays in the I
2
C accesses to accommodate the internal processor
timing. In accordance with I
2
C specifications, the TVP5146M2 decoder holds the I
2
C clock line (SCL) low
to indicate the wait period to the I
2
C master. If the I
2
C master is not designed to check for the I
2
C clock
line held-low condition, then the maximum delays must always be inserted where required. These delays
are of variable length; maximum delays are indicated in the following diagram:
Normal register
S 10111000 ACK Subaddress ACK Send Data ACK ...Wait 64 µs... P
2.7 VBI Data Processor
The TVP5146M2 VDP slices various data services such as teletext (WST, NABTS), closed caption (CC),
wide screen signaling (WSS), program delivery control (PDC), vertical interval time code (VITC), video
program system (VPS), copy generation management system (CGMS) data, and electronic program guide
(EPG or Gemstar) 1x/2x. Table 2-6 shows the supported VBI system.
These services are acquired by programming the VDP to enable the reception of one or more VBI data
standard(s) in the VBI. The VDP can be programmed on a line-per-line basis to enable simultaneous
reception of different VBI formats, one per line. The results are stored in a FIFO and/or registers. Because
of its high data bandwidth, the teletext results are stored in FIFO only. The TVP5146M2 decoder provides
fully decoded V-Chip data to the dedicated registers at subaddresses 800540h to 800543h (see
Table 2-117 through Table 2-120).
Table 2-6. Supported VBI System
VBI SYSTEM STANDARD LINE NUMBER NUMBER OF BYTES
Teletext WST A SECAM 6-23 (Fields 1 and 2) 38
Teletext WST B PAL 6-22 (Fields 1 and 2) 43
Teletext NABTS C NTSC 10-21 (Fields 1 and 2) 34
Teletext NABTS D NTSC-J 10-21 (Fields 1 and 2) 35
Closed Caption PAL 22 (Fields 1 and 2) 2
Closed Caption NTSC 21 (Fields 1 and 2) 2
WSS-CGMS PAL 23 (Fields 1 and 2) 14 bits
WSS-CGMS NTSC 20 (Fields 1 and 2) 20 bits
VITC PAL 6-22 9
VITC NTSC 10-20 9
VPS (PDC) PAL 16 13
V-Chip (decoded) NTSC 21 (Field 2) 2
Gemstar 1x NTSC 2
Gemstar 2x NTSC 5 with frame byte
User Any Programmable Programmable
34 Functional Description Copyright © 2005–2012, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Link(s): TVP5146M2