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ADV7181B
Subaddress
Register
Bit Description
Analog
0x14
Reserved.
Clamp
CCLEN. Current clamp enable allows
Control
the user to switch off the current
sources in the analog front.
Reserved.
0x15
Digital
Reserved.
Clamp
DCT[1:0]. Digital clamp timing
Control 1
determines the time constant of the
digital fine clamp circuitry.
Reserved.
0x17
Shaping
YSFM[4:0]. Selects Y Shaping Filter
Filter
mode when in CVBS only mode.
Control
Allows the user to select a wide
range of low-pass and notch filters.
If either auto mode is selected, the
decoder selects the optimum Y filter
depending on the CVBS video
source quality (good vs. bad).
CSFM[2:0].
C shaping filter mode allows the
selection from a range of low-pass
chrominance filters, SH1 to SH5 and
wideband mode.
Bits
7 6
5
4 3
2
1
0
0
1
0
1
0 0
0
0 x
x
x
0
0
0
1
1
0
1
1
0
0 0
0
0
0 0
0
0
0 0
0
1
0 0
0
1
0 0
1
0
0 0
1
0
0 0
1
1
0 0
1
1
0 1
0
0
0 1
0
0
0 1
0
1
0 1
0
1
0 1
1
0
0 1
1
0
0 1
1
1
0 1
1
1
1 0
0
0
1 0
0
0
1 0
0
1
1 0
0
1
1 0
1
0
1 0
1
0
1 0
1
1
1 0
1
1
1 1
0
0
1 1
0
0
1 1
0
1
1 1
0
1
1 1
1
0
1 1
1
0
1 1
1
1
1 1
1
1
0 0
0
0 0
1
0 1
0
0 1
1
1 0
0
1 0
1
1 1
0
1 1
1
Rev. B | Page 76 of 100
0
Comments
0
Set to default
Current sources switched
off
Current sources enabled
Set to default
x
Set to default
Slow (TC = 1 sec)
Medium (TC = 0.5 sec)
Fast (TC = 0.1 sec)
TC dependent on video
Set to default
0
Auto wide notch for poor
quality sources or wide-
band filter with comb for
good quality input
1
Auto narrow notch for
poor quality sources or
wideband filter with comb
for good quality input
0
SVHS 1
1
SVHS 2
0
SVHS 3
1
SVHS 4
0
SVHS 5
1
SVHS 6
0
SVHS 7
1
SVHS 8
0
SVHS 9
1
SVHS 10
0
SVHS 11
1
SVHS 12
0
SVHS 13
1
SVHS 14
0
SVHS 15
1
SVHS 16
0
SVHS 17
1
SVHS 18 (CCIR601)
0
PAL NN1
1
PAL NN2
0
PAL NN3
1
PAL WN 1
0
PAL WN 2
1
NTSC NN1
0
NTSC NN2
1
NTSC NN3
0
NTSC WN1
1
NTSC WN2
0
NTSC WN3
1
Reserved
Auto selection 15 MHz
Auto selection 2.17 MHz
SH1
SH2
SH3
SH4
SH5
Wideband mode
Notes
Decoder selects
optimum Y shaping
filter depending on
CVBS quality.
If one of these
modes is selected,
the decoder does
not change filter
modes. Depending
on video quality, a
fixed filter response
(the one selected) is
used for good and
bad quality video.
Automatically
selects a C filter for
the specified 3 dB
cutoff.
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