adv7188 Analog Devices, Inc., adv7188 Datasheet - Page 89

• Manufacturer Part Number: adv7188
• Description: Multiformat Sdtv Video Decoder With Fast Switch Overlay Support
• Manufacturer: Analog Devices, Inc.

Address
0x2B
0x2C
0x2D
0x2E
0x2F
0x30
Register
Miscellaneous
Gain Control
AGC Mode Control
Chroma Gain
Control 1
Chroma Gain
Control 2
Luma Gain Control 1
Luma Gain Control 2 LG [7:0]/LMG [7:0]. Luma manual gain. These
Bit Description
CTA [2:0]. Chroma timing adjust. These bits
allow a specified timing difference between
the luma and chroma samples.
AUTO_PDC_EN. This bit automatically
programs the LTA/CTA values to align luma
and chroma at the output for all modes of
operation.
SWPC. This bit allows the Cr and Cb samples
to be swapped.
PW_UPD. Peak white update. This bit
determines the rate of gain change.
Reserved.
CKE. Color-kill enable. This bit allows the
color-kill function to be switched on and off.
Reserved.
CAGC [1:0]. Chroma automatic gain control.
These bits select the basic mode of operation
for the AGC in the chroma path.
Reserved.
LAGC [2:0]. Luma automatic gain control.
These bits select the mode of operation for
the gain control in the luma path.
Reserved.
CG [11:8]/CMG [11:8]. Chroma manual gain.
These bits can be used to program a desired
manual chroma gain. Reading back from these
bits in AGC mode gives the current gain.
Reserved.
CAGT [1:0]. Chroma automatic gain timing.
These bits allow adjustment of the chroma
AGC tracking speed.
CG [7:0]/CMG [7:0]. Lower eight bits of chroma
manual gain. See CG [11:8]/CMG [11:8] for
description.
LG [11:8]/LMG [11:8]. Luma manual gain.
These bits can 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.
These bits allow adjustment of the luma AGC
tracking speed.
bits can be used to program a desired manual
chroma gain or to read back the actual gain
value used.
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7 6 5 4 3 2 1 0 Comments
0
1
1
1
0 0
0 1
1 0
1 1
0 0 0 0 0 0 0 0 CMG [11:0] = 750d, gain is 1 in
0 0
0 1
1 0
1 1
x x x x x x x x LMG [11:0] = 1128d, gain is 1 in
0
1
0
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
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
1 0 0 0 0
1 1
1 1
Bit
1 1
0 1 0 0
x x x x LAGC [2:0] settings decide in
1
0 0 Manual fixed gain
0 1 Use luma gain for chroma
1 0 Automatic gain
1 1 Freeze chroma gain
0 Update once per video line
1 Update once per field
Not a valid setting
Chroma + two pixels (early)
Chroma + one pixel (early)
No delay
Chroma − one pixel (delayed)
Chroma − two pixels (delayed)
Chroma −three pixels (delayed)
Not a valid setting
Use values in LTA [1:0] and CTA [2:0]
for delaying luma and chroma
LTA and CTA values determined
automatically
No swapping
Swap the Cr and Cb output samples
Set to default
Color kill disabled
Color kill enabled
Set to default
Set to 1
Manual fixed gain
Reserved
AGC peak white algorithm enabled
Reserved
AGC peak white algorithm disabled Blank level to sync tip
Reserved
Reserved
Freeze gain
Set to 1
Set to 1
Slow (TC = 2 sec)
Medium (TC = 1 sec)
Fast (TC = 0.2 sec)
Adaptive
NTSC; CMG [11:0] = 741d, gain
is 1 in PAL
which mode LMG [11:0] operates
Set to 1
Slow (TC = 2 sec)
Medium (TC = 1 sec)
Fast (TC = 0.2 sec)
Adaptive
NTSC; LMG [11:0] = 1222d, gain
is 1 in PAL
Notes
CVBS mode CTA [2:0] = 011b
S-video mode CTA [2:0] = 101b
YPrPb mode CTA [2:0] = 110b
Peak white must be enabled (see
LAGC [2:0])
For SECAM color kill, threshold is set at
8% (see CKILLTHR [2:0])
Use CMG [11:0]
Based on color burst
Use LMG [11:0]
Blank level to sync tip
Blank level to sync tip
CAGC [1:0] must be set to 00 (manual
fixed gain) to use CMG [11:0].
Has an effect only if CAGC [1:0] is set
to 10 (automatic gain).
Minimum value is 0d (G = −60 dB;
maximum value is 3750d (G = +5 dB).
Only has an effect if LAGC [2:0] is set to
010 or 100 (autogain).
Minimum value of NTSC is 1024
(G = 0.90) and of PAL is 1024 (G = 0.84);
Maximum value of NTSC is 4095
(G = 3.63) and of PAL is 4095 (G = 3.35).
ADV7188