ADV7181B
Rev. B | Page 82 of 100
Bits
Subaddress
Register
Bit Description
7
6 5
4
3 2
1
0 Comments Notes
Reserved.
0
1
0
0
0
0
Set to default
0 SFL
compatible
with
ADV7190/ADV7191/
ADV7194 encoders
SFL_INV. Controls the behavior of
the PAL switch bit.
1 SFL
compatible
with
ADV717x/ADV7173x
encoders
0x41 Resample
Control
Reserved.
0
Set to default
0x48 Gemstar
Control 1
GDECEL[15:8]. See the Comments
column.
0
0
0
0
0
0
0
0
0x49 Gemstar
Control 2
GDECEL[7:0]. See the Comments
column.
0
0
0
0
0
0
0
0
GDECEL[15:0]; 16
individual enable bits that
select the lines of video
(even field Lines 10 to 25)
that the decoder checks
for Gemstar-compatible
data
LSB = Line 10;
MSB = Line 25.
Default = Do not
check for Gemstar-
compatible data on
any lines[10 to 25]
in even fields.
0x4A Gemstar
Control 3
GDECOL[15:8]. See the Comments
column.
0
0
0
0
0
0
0
0
0x4B Gemstar
Control 4
GDECOL[7:0]. See the Comments
column.
0
0
0
0
0
0
0
0
GDECOL[15:0]; 16
individual enable bits that
select the lines of video
(odd field Lines 10 to 25)
that the decoder checks
for Gemstar-compatible
data
LSB = Line 10;
MSB = Line 25.
Default = Do not
check for Gemstar-
compatible data on
any lines[10 to 25]
in odd fields.
0
Split data into half byte
To avoid 00/FF
code.
GDECAD. Controls the manner in
which decoded Gemstar data is
inserted into the horizontal blanking
period.
1
Output in straight 8-bit
format
0x4C Gemstar
Control 5
Reserved.
x
x
x
x
x
x
x Undefined
0 Disable
CTI
CTI_EN. CTI enable.
1 Enable
CTI
0
Disable CTI alpha blender
CTI_AB_EN. Enables the mixing of
the transient improved chroma with
the original signal.
1
Enable CTI alpha blender
0 0 Sharpest
mixing
0 1 Sharp
mixing
1 0 Smooth
CTI_AB[1:0]. Controls the behavior
of the alpha-blend circuitry.
1
1 Smoothest
Reserved.
0
Set to default
0
Bypass the DNR block
DNR_EN. Enable or bypass the DNR
block.
1
Enable the DNR block
0x4D CTI
DNR
Control 1
Reserved.
1
1
Set to default
0x4E CTI
DNR
Control 2
CTI_CTH[7:0]. Specifies how big the
amplitude step must be to be
steepened by the CTI block.
0
0
0
0
1
0
0
0
0x50 CTI
DNR
Control 4
DNR_TH[7:0]. Specifies the
maximum edge that is interpreted
as noise and is therefore blanked.
0 0
0
0
1
0
0
0
Set to 0x04 for A/V input;
set to 0x0A for tuner input
