adv7189b Analog Devices, Inc., adv7189b Datasheet - Page 78

• Manufacturer Part Number: adv7189b
• Description: Multiformat Sdtv Video Decoder
• Manufacturer: Analog Devices, Inc.

ADV7189B
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. B | Page 78 of 104
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
No delay
Luma 1 clk (37ns) delayed
Luma 2 clk (74ns) early
Luma 1 clk (37ns) early
Set to 0
Not valid setting
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
LTA and CTA values
determined automatically
No swapping
Swap the Cr and Cb O/P
samples
Update once per video
line
Update once per field
Set to default
Color kill disabled
Color kill enabled
Set to default
Manual fixed gain
Use luma gain for chroma
Automatic gain
Freeze chroma gain
Set to 1
Manual fixed gain
AGC Peak white algorithm
off
AGC Peak white algorithm
on.
Reserved
Reserved
Reserved
Reserved
Freeze gain
Set to 1
Notes
CVBS mode
LTA[1:0] = 00b;
S-Video mode
LTA[1:0] = 01b;PrPb
mode LTA[1:0] = 01b
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