adv7180 Analog Devices, Inc., adv7180 Datasheet - Page 86

• Manufacturer Part Number: adv7180
• Description: 10-bit, 4 X Oversampling Sdtv Video Decoder
• Manufacturer: Analog Devices, Inc.

ADV7180
Subaddress
0x27
0x2B
0x2C
0x2D
0x2E
Register
Pixel Delay
Control
Misc Gain
Control
AGC Mode
Control
Chroma Gain
Control 1
Chroma Gain
Control 2
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 auto-
matic gain control selects
the mode of operation for
the gain control in the
luma path.
Reserved.
CMG[11:8]/CG[11:8]. In
manual mode, the chroma
gain control can be used to
program a desired manual
chroma gain. In auto mode,
it can be used to read back
the current gain value.
Reserved.
CAGT[1:0]. Chroma auto-
matic gain timing allows
adjustment of the chroma
AGC tracking speed.
CMG[7:0]/CG[7:0]. Chroma
manual gain lower eight
bits. See CMG[11:8]/
CG[11:8] for description.
7
0
1
1
1
0
0
1
1
0
(Shading Indicates Default State)
6
0
1
0
1
0
0
0
0
1
1
1
1
0
1
0
1
0
Rev. B | Page 86 of 112
5
0
0
0
0
1
1
1
1
1
0
0
1
1
0
0
1
1
1
0
4
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
1
0
Bits
3
0
1
0
1
0
1
0
1
0
1
0
0
2
0
0
1
1
0
1
0
1
1
1
0
0
0
1
1
0
0
0
0
0
0
1
0
1
0
1
0
1
0
0
LQFP-64
No delay
Luma 1 clock (37 ns) late
Luma 2 clock (74 ns) early
Luma 1 clock (37 ns) 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
Reserved
Peak white algorithm on
Reserved
Peak white algorithm off
Reserved
Reserved
Freeze gain
Set to 1
Set to 1
Slow (TC = 2 sec)
Medium (TC = 1 sec)
Fast (TC = 0.2 sec)
Adaptive
CMG[11:0] = 750d; gain is 1 in NTSC.
CMG[11:0] = 741d; gain is 1 in PAL
Comments
LFCSP-40
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, Address 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
CAGC[1:0] settings
decide in which
mode CMG[11:0]
operates
Has an effect only
if CAGC[1:0] is set
to autogain (10)
Min value is 0 dec
(G = 1/1000)
Max value is
3750 dec (Gain = 5)