ADV7181 AD [Analog Devices], ADV7181 Datasheet - Page 78

• Manufacturer Part Number: ADV7181
• Description: Multiformat SDTV Video Decoder
• Manufacturer: AD [Analog Devices]

ADV7181B
Subaddress
0x2D
0x2E
0x2F
0x30
0x31
0x32
0x33
Chroma
Register
Gain
Control 1
Chroma
Gain
Control 2
Luma Gain
Control 1
Luma Gain
Control 2
VS and
FIELD
Control 1
VSync
Field
Control 2
VSync
Field
Control 3
Bit Description
CMG[11:8]. Chroma manual gain can
be used to program a desired
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.
CMG[7:0]. Chroma manual gain
lower 8 bits. See CMG[11:8] for
description.
LMG[11:8]. Luma manual gain can
be used 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.
LMG[7:0]. Luma manual gain can be
used to program a desired manual
chroma gain or read back the actual
used gain value.
Reserved
HVSTIM. Selects where within a line
of video the VS signal is asserted.
NEWAVMODE. Sets the EAV/SAV
mode.
Reserved
Reserved
VSBHE
VSBHO
Reserved
VSEHE
VSEHO
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7 6
0 0
0 1
1 0
1 1
0 0
0 0
0 1
1 0
1 1
x x
0 0
0
1
0
1
0
1
0
1
5
1
0
1
x
0
0
0
4 3
1
0 0
1
x
0
1
0 0
0 0
Bits
0
x
x
0
1
2
1
0
x
x
0
0
1
1
0
0
x
x
1
0
0
0
0
0
x
x
0
1
0
Comments
Set to 1
Slow (TC = 2 s)
Medium (TC = 1 s)
Fast (TC = 0.2 s)
Adaptive
CMG[11:0] = 750d; gain is
1 in NTSC
CMG[11:0] = 741d; gain is
1 in PAL
LAGC[1:0] settings decide
in which mode LMG[11:0]
operates
Set to 1
Slow (TC = 2 s)
Medium (TC = 1 s)
Fast (TC = 0.2 s)
Adaptive
LMG[11:0] = 1234d; gain is
1 in NTSC LMG[11:0] =
1266d; gain is 1 in PAL
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
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)
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
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 0dec
(G = –60 dB)
Max value is 3750
(Gain = 5)
Only has an effect 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.