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