Datasheet

TVP5158, TVP5157, TVP5156

www.ti.com

SLES243G –JULY 2009–REVISED APRIL 2013

Table 3-13. Bit Field Definition of 4-Byte Start Code for Active Video Line (continued)

BIT NAME FUNCTION

7 1 Always set to 1.

F-bit

6 F 0: First field of frame

1: Second field of frame

V-bit

5 V 0: when not in vertical blanking

1: during vertical blanking

H-bit. Always set to 0.

4 H 0: SAV

1: EAV (never used)

3 P3 P3 = V XOR H, Protection bits used for error detection/correction

2 P2 P2 = F XOR H, Protection bits used for error detection/correction

1 P1 P1 = F XOR V, Protection bits used for error detection/correction

0 P0 P0 = F XOR V XOR H, Protection bits used for error detection/correction

NOTE

For line-interleaved output mode, if none of video decoder channels has the data ready at a

given time, TVP5158 outputs the dummy line until any one of video decoder channels is

ready to output a line. The backend chip needs to keep only the active video line and ignore

the dummy line.

The start code of the dummy line is different with active video line. Table 3-14 shows the bit assignment

and field definition of 4-Byte start code for the Dummy Line.

Table 3-14. Bit Assignment of 4-Byte Start Code for the Dummy Line

BYTE 7 6 5 4 3 2 1 0

SC[3] 0 0 0 0 0 0 0 1

SC[2] 0 0 0 0 0 0 0 1

SC[1] 0 0 0 0 0 0 0 1

SC[0] 0 0 0 0 0 0 0 1

NOTE

The Dummy Line can be distinguished from active video line by looking at the MSB of byte

SC[0].

3.9 Audio Sub-System (TVP5157 and TVP5158 Only)

The audio sub-system integrates a 4-Ch audio analog-to-digital converter, digital processing, and I

encoder. TVP5158 audio sub-system supports 4-Ch mono analog audio input and standard/multiple I

output. TVP5158 also supports audio cascade connection up to four devices cascade connected for 16-Ch

audio input.

3.9.1 Features

• Four mono analog audio input channels

– Requires external passive attenuator to support 2.828-Vpp analog audio input

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Product Folder Links: TVP5158 TVP5157 TVP5156