Functional Description
25
SLES141B—August 2007
TVP5146M2PFP
2.6.4 I2C Timing Requirements
The TVP5146M2 decoder requires delays in the I2C accesses to accommodate the internal processor timing.
In accordance with I2C specifications, the TVP5146M2 decoder holds the I2C clock line (SCL) low to indicate
the wait period to the I2C master. If the I2C master is not designed to check for the I2C 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
s
P
2.7
VBI Data Processor
The TVP5146M2 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 26 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–800543h (see Sections 2.12.4 through
2.12.7).
Table 26. 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