MAX9526 datasheet(30/38 Pages) MAXIM

30 / 38 page

Low-Power, High-Performance

NTSC/PAL Video Decoder

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OUTPUT OF DECODER

DESCRIPTION

STDSEL

0x04

B7-5

AUTOD

0x04

TGENAB

0x0C

TGTIM

0x0C

TGSRC

0x0C

NO VIDEO

INPUT

VALID VIDEO

INPUT

Default mode, test pattern

has last timing standard

used at output

0X0

Test pattern

Decoded input

Force test pattern with last

timing standard used at

output

0X0

Test pattern

Force test pattern with

50Hz timing

XXX

50Hz test

pattern

50Hz test pattern

Force test pattern with

60Hz timing

XXX

60Hz test

pattern

60Hz test pattern

Force 50Hz timing for

decoding and test pattern

X0X

50Hz test

pattern

Decoded input

with 50Hz timing

Force 60Hz timing for

decoding and test pattern

X1X

60Hz test

pattern

Decoded input

with 60Hz timing

Table 8. Output Test Signal Setup

Test Pattern Generation

In default mode, the MAX9526 outputs a test pattern

when video is removed. The timing standard for the test

pattern is the last timing standard that is at the output of

the decoder. If the MAX9526 is reset and has no video

inputs, the default output timing standard is 525 lines

(60Hz). See register 0x04 for manually configuring the

video standard decoding. Table 8 gives some common

examples of setting up video standards and test pat-

tern generation.

Test Pattern Enable (TGEnab)

1 = Force a test pattern at video output.

0 = Output a test pattern if no video is present at the

video inputs (default).

Test Signal Output Timing Standard (TGTIM)

1 = 525 line, 60Hz frame rate.

0 = 625 line, 50Hz frame rate (default).

This bit is ignored if TGSRC = 1.

Test Signal Timing Source (TGSRC)

1 = Test generator uses timing from incoming video

signal (if signal is valid).

0 = Test generator uses internally generated timing

(default).

Color Bar Select (CBAR)

00 = Black screen (default)

01 = Blue screen

10 = 75% color bars

11 = 100% color bars

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