Analog Devices ADV7181BCP Manual page 78

ADV7181B
Subaddress Register
0x27 Pixel Delay
Control
0x2B Misc Gain
Control
0x2C AGC Mode
Control
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Bit Description
LTA[1:0]. Luma timing adjust allows
the user to specify a timing difference
between chroma and luma samples.
Reserved.
CTA[2:0]. Chroma timing adjust
allows a specified timing difference
between the luma and chroma
samples.
AUTO_PDC_EN. Automatically
programs the LTA/CTA values so
that luma and chroma are aligned at
the output for all modes of
operation.
SWPC. Allows the Cr and Cb samples
to be swapped.
PW_UPD. Peak white update
determines the rate of gain.
Reserved.
CKE. Color kill enable allows the
color kill function to be switched on
and off.
Reserved.
CAGC[1:0]. Chroma automatic gain
control selects the basic mode of
operation for the AGC in the chroma
path.
Reserved.
LAGC[2:0]. Luma automatic gain
control selects the mode of
operation for the gain control in the
luma path.
Reserved.
Bits
7 6 5 4 3 2 1 0
0 0
1 0
1 0
1 1
0
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
1
0
1
0
1
1 0 0 0 0
0
1
1
0 0
0 1
1 0
1 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
Rev. B | Page 78 of 100
Comments Notes
No delay CVBS mode
LTA[1:0] = 00b;
Luma 1 clk (37 ns) delayed
S-Video mode
Luma 2 clk (74 ns) early
LTA[1:0]= 01b,
YPrPb mode
Luma 1 clk (37 ns) early
LTA[1:0] = 01b.
Set to 0
Not valid setting CVBS mode
CTA[2:0] = 011b.
Chroma +2 pixels (early)
Chroma +1 pixel (early)
S-Video mode
No delay
CTA[2:0] = 101b.
Chroma -1 pixel (late)
Chroma -2 pixels (late) YPrPb mode
CTA[2:0] = 110b.
Chroma -3 pixels (late)
Not valid setting
Use values in LTA[1:0] and
CTA[2:0] for delaying
luma/chroma
LTA and CTA values
determined automatically
No swapping See
Swap_CR_CB_WB,
Swap the Cr and Cb O/P
Addr 0x89.
samples
Update once per video Peak white must be
line enabled. See
LAGC[2:0].
Update once per field
Set to default
Color kill disabled For SECAM color kill,
threshold is set at
Color kill enabled
8%.
See CKILLTHR[2:0].
Set to default
Manual fixed gain Use CMG[11:0].
Use luma gain for chroma
Automatic gain Based on color
burst.
Freeze chroma gain
Set to 1
Manual fixed gain Use LMG[11:0].
Peak white algorithm off Blank level to sync
tip.
Peak white algorithm onl Blank level to sync
tip.
AGC no override through Blank level to sync
peak white; automatic IRE tip.
control
AGC auto-override through Blank level to sync
peak white; automatic IRE tip.
control
AGC active video with
peak white
AGC active video with
average video
Freeze gain
Set to 1