ADV7181 AD [Analog Devices], ADV7181 Datasheet - Page 77

• Manufacturer Part Number: ADV7181
• Description: Multiformat SDTV Video Decoder
• Manufacturer: AD [Analog Devices]

Subaddress
0x27
0x2B
0x2C
Register
Pixel Delay
Control
Misc Gain
Control
AGC Mode
Control
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
Rev. 0 | Page 77 of 96
7 6
0
1
1
1
0
1
0
1
0
0
0
0
1
1
1
1
5
0
0
0
0
1
1
1
1
1
0
0
1
1
0
0
1
1
4 3
0 0
0 1
1 0
1 1
0 0
0 1
1 0
1 1
0 0
0
1
0
1
0
1
0
1
Bits
1
2
0
0
1
1
0
1
1
1
0
0
0
1
1
0
0
0
0
1
0
1
0
1
0
1
Comments
Chroma +1 pixel (early)
CTA[2:0] for delaying
luma/chroma
LTA and CTA values
determined automatically
No Swapping
samples
line
Color kill enabled
Set to default
peak white. Man IRE
control.
AGC auto-override
through peak white. Man
IRE control.
peak white. Auto IRE
control.
AGC auto-override through
peak white. Auto IRE
control.
peak white
average video
Set to 1
No Delay
Luma 1 clk (37 nS) delayed
Luma 2 clk (74 nS) early
Luma 1 clk (37 nS) early
Set to Zero
Not valid setting
Chroma +2 pixels (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
Swap the Cr and Cb O/P
Update once per video
Update once per field
Set to default
Color kill disabled
Manual fixed gain
Use luma gain for chroma
Automatic gain
Freeze chroma gain
Set to 1
Manual fixed gain
AGC no override through
AGC no override through
AGC active video with
AGC active video with
Freeze gain
Notes
CVBS mode
LTA[1:0] = 00b;
S-Video mode
LTA[1:0]= 01b,
YPrPb mode
LTA[1:0] = 01b
CVBS mode
CTA[2:0] = 011b
S-Video mode
CTA[2:0] = 101b
YPrPb mode
CTA[2:0] = 110b
See
Swap_CR_CB_WB,
Addr 0x89
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
Blank level to sync
tip
Blank level to sync
tip
ADV7181B