Analog Devices ADV7181B Manual page 79

Subaddress Register Bit Description
0x2D Chroma CMG[11:8]. Chroma manual gain can
Gain be used to program a desired
Control 1 manual chroma gain. Reading back
from this register in AGC mode gives
the current gain.
Reserved.
CAGT[1:0]. Chroma automatic gain
timing allows adjustment of the
chroma AGC tracking speed.
0x2E Chroma CMG[7:0]. Chroma manual gain
Gain lower 8 bits. See CMG[11:8] for
Control 2 description.
0x2F Luma Gain LMG[11:8]. Luma manual gain can
Control 1 be used to program a desired
manual chroma gain, or to read
back the actual gain value used.
Reserved.
LAGT[1:0]. Luma automatic gain
timing allows adjustment of the
luma AGC tracking speed.
0x30 Luma Gain LMG[7:0]. Luma manual gain can be
Control 2 used to program a desired manual
chroma gain or read back the actual
used gain value.
0x31 VS and Reserved.
FIELD
HVSTIM. Selects where the VS signal
Control 1
is asserted within a line of video.
NEWAVMODE. Sets the EAV/SAV
mode.
Reserved.
0x32 Vsync Field Reserved.
Control 2
VSBHE.
VSBHO.
0x33 Vsync Field Reserved.
Control 3
VSEHE.
VSEHO.
Bits
7 6 5 4 3 2 1
0 1 0
1 1
0 0
0 1
1 0
1 1
0 0 0 0 0 0 0
x x x
1 1
0 0
0 1
1 0
1 1
x x x x x x x
0 1
0
1
0
1
0 0 0
0 0 0 0 0
0
1
0
1
0 0 0 1 0
0
1
0
1
Rev. B | Page 79 of 100
0 Comments
0
Set to 1
Slow (TC = 2 sec)
Medium (TC = 1 sec)
Fast (TC = 0.2 sec)
Adaptive
0 CMG[11:0] = 750d; gain is
1 in NTSC
CMG[11:0] = 741d; gain is
1 in PAL
x LAGC[1:0] settings decide
in which mode LMG[11:0]
operates
Set to 1
Slow (TC = 2 sec)
Medium (TC = 1 sec)
Fast (TC = 0.2 sec)
Adaptive
x LMG[11:0] = 1234d; gain is
1 in NTSC LMG[11:0] =
1266d; gain is 1 in PAL
0 Set to default
Start of line relative to HSE
Start of line relative to HSB
EAV/SAV codes generated
to suit ADI encoders
Manual VS/field position
controlled by registers
0x32, 0x33, and 0xE5–0xEA
Set to default
1 Set to default
VS goes high in the middle
of the line (even field)
VS changes state at the
start of the line (even field)
VS goes high in the middle
of the line (odd field)
VS changes state at the
start of the line (odd field)
0 Set to default
VS goes low in the middle
of the line (even field)
VS changes state at the
start of the line (even
field)
VS goes low in the middle
of the line (odd field)
VS changes state at the
start of the line (odd field)
ADV7181B
Notes
CAGC[1:0] settings
decide in which
mode CMG[11:0]
operates.
Has an effect only if
CAGC[1:0] is set to
auto gain (10).
Min value is 0 d
(G = –60 dB)
Max value is 3750
(Gain = 5).
Has an effect only if
LAGC[1:0] is set to
auto gain (001, 010,
011, or 100).
Min value
NTSC 1024 (G = 0.85),
PAL (G = 0.81).
Max value
NTSC 2468 (G = 2),
PAL = 2532 (G = 2).
HSE = Hsync end.
HSB = Hsync begin.
NEWAVMODE bit
must be set high.
NEWAVMODE bit
must be set high.