Datasheet

SLES084C − August 2007 TVP5146

2.6.4 I

C Timing Requirements

The TVP5146 decoder requires delays in the I

C accesses to accommodate the internal

processor timing. In accordance with I

C specifications, the TVP5146 decoder holds the I

clock line (SCL) low to indicate the wait period to the I

C master. If the I

C master is not

designed to check for the I

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 1011 1000 ACK Subaddress ACK Send data ACK Wait 64 µs P

2.7 VBI Data Processor

The TVP5146 VBI data processor (VDP) slices various data services like 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 (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 TVP5146 decoder provides fully decoded V-CHIP data to the dedicated registers at

subaddresses 800540h–800543h (see Sections 2.12.4 through 2.12.7).

Table 2−6. Supported VBI Systems

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 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 1× NTSC 2

Gemstar 2× NTSC 5 with frame byte

User Any Programmable Programmable