
ADV7180
Rev. A | Page 86 of 112
Bits (Shading Indicates Default
State)
6
5
4
Comments
Subaddress
0x27
Register
Pixel Delay Control
Bit Description
LTA[1:0]. Luma timing
adjust allows the user
to specify a timing
difference between
chroma and luma
samples.
7
3
2
1
0
0
0
LQFP-64
No delay
LFCSP-40
Notes
CVBS mode LTA[1:0] = 00b,
S-video mode LTA[1:0] = 01b,
YPrPb mode LTA[1:0] = 01b
1
0
Luma 1 clock (37 ns) late
1
0
Luma 2 clock (74 ns) early
1
1
Luma 1 clock (37 ns) early
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.
0
0
0
0
Set to 0
Not valid setting
CVBS mode CTA[2:0] = 011b,
S-Video mode CTA[2:0] = 101b,
YPrPb mode CTA[2:0] = 110b
0
0
0
0
1
1
1
1
0
1
1
0
0
1
1
1
0
1
0
1
0
1
Chroma + 2 pixels (early)
Chroma + 1 pixel (early)
No delay
Chroma 1 pixel (late)
Chroma 2 pixels (late)
Chroma 3 pixels (late)
Not valid setting
Use values in LTA[1:0] and
CTA[2:0] for delaying
luma/chroma
1
LTA and CTA values
determined automatically
0
No swapping
1
Swap the Cr and Cb O/P
samples
Update once per video line
Update once per field
See Swap_CR_CB_WB,
Addr 0x89
0x2B
0
1
PW_UPD. Peak white
update determines the
rate of gain.
Peak white must be
enabled; see LAGC[2:0]
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.
0
1
1
0
0
0
0
Set to default
Color kill disabled
Color kill enabled
For SECAM color kill,
threshold is set at 8%;
see CKILLTHR[2:0]
0x2C
Misc Gain Control
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
1
1
0
0
1
1
0
1
0
1
Set to default
Manual fixed gain
Use luma gain for chroma
Automatic gain
Freeze chroma gain
Set to 1
Manual fixed gain
Reserved
Peak white algorithm on
Reserved
Peak white algorithm off
Reserved
Reserved
Freeze gain
Set to 1
Use CMG[11:0]
Based on color burst
Use LMG[11:0]
Blank level to sync tip
Blank level to sync tip
AGC Mode Control
Reserved.