Datasheet

ADV7189B
Rev. B | Page 79 of 104
Bits
Subaddress Register Bit Description
7 6 5 4 3 2 1 0 Comments Notes
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.
0 1 0 0 CAGC[1:0] settings
decide in which
mode CMG[11:0]
operates
Reserved 1 1 Set to 1
00 Slow (TC = 2 sec)
01 Medium (TC = 1 sec)
1 0 Fast (TC = 0.2 sec)
0x2D Chroma
Gain
Control 1
CAGT[1:0]. Chroma automatic gain
timing allows adjustment of the
chroma AGC tracking speed.
1 1 Adaptive
Has an effect only if
CAGC[1:0] is set to
auto gain (10)
0x2E Chroma
Gain
Control 2
CMG[7:0]. Chroma manual gain
lower 8 bits. See CMG[11:8] for
description.
0 0 0 0 0 0 0 0 CMG[11:0] = 750d; gain is
1 in NTSC
CMG[11:0] = 741d; gain is
1 in PAL
Min value is 0 dec
(G = –60 dB)
Max value is 3750
(Gain = 5)
LMG[11:8]. Luma manual gain can
be used program a desired manual
chroma gain, or to read back the
actual gain value used.
x x x x LAGC[1:0] settings decide
in which mode LMG[11:0]
operates
Reserved 1 1 Set to 1
00 Slow (TC = 2 sec)
01 Medium (TC = 1 sec)
1 0 Fast (TC = 0.2 sec)
0x2F Luma Gain
Control 1
LAGT[1:0]. Luma automatic gain
timing allows adjustment of the
luma AGC tracking speed.
1 1 Adaptive
Only has an effect if
LAGC[1:0] is set to
auto gain (001, 010,
011, or 100)
0x30 Luma Gain
Control 2
LMG[7:0]. Luma manual gain can be
used to program a desired manual
chroma gain or read back the
actual used gain value.
x x x x x x x x LMG[11:0] = 1234dec; gain
is 1 in NTSC LMG[11:0] =
1266d; gain is 1 in PAL
Min value
NTSC 1024 (G = 0.85)
PAL (G = 0.81)
Max value
NTSC 2468 (G = 2),
PAL = 2532 (G = 2)
0x31 Reserved 0 1 0 Set to default
0 Start of line relative to HSE HSE = Hsync end
HVSTIM. Selects where within a line
of video the VS signal is asserted.
1 Start of line relative to HSB HSB = Hsync begin
0 EAV/SAV codes generated
to suit ADI encoders
NEWAVMODE. Sets the EAV/SAV
mode.
1 Manual VS/Field position
controlled by registers
0x32, 0x33, and 0xE5–
0xEA
VS and
FIELD
Control 1
Reserved 0 0 0 Set to default
Reserved 0 0 0 0 0 1 Set to default
VSBHE 0 VS goes high in the
middle of the line (even
field)
1 VS changes state at the
start of the line (even
field)
VSBHO 0 VS goes high in the
middle of the line (odd
field)
0x32 Vsync Field
Control 2
1 VS changes state at the
start of the line (odd field)
NEWAVMODE bit
must be set high.
Reserved 0 0 0 1 0 0 Set to default
VSEHE 0 VS goes low in the middle
of the line (even field)
1 VS changes state at the
start of the line (even
field)
0x33 Vsync Field
Control 3
VSEHO 0 VS goes low in the middle
of the line (odd field)
1 VS changes state at the
start of the line (odd field)
NEWAVMODE bit
must be set high.