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ADV7181B
Rev. 0 | Page 85 of 96
Bits
4
x
0
Subaddress
0xC4
Register
ADC
SWITCH 2
Bit Description
ADC2_SW[3:0]. Manual muxing
control for ADC2.
7
0
1
6
x
5
x
3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Comments
No connection
No connection
No connection
No connection
No connection
AIN6
No connection
No connection
No connection
No connection
No connection
No connection
No connection
AIN5
No connection
No connection
Disable
Enable
Default threshold for the
detection of black lines.
Set as default
LB detection ends with
the last line of active video
on a field.
1100b: 262/525.
Letterbox detection
aligned with the start of
active video,
0100b: 23/286 NTSC.
Notes
SETADC_sw_
man_en = 1
Reserved
ADC_SW_MAN_EN. Enable manual
setting of the input signal muxing.
LB_TH [4:0]. Sets the threshold value
that determines if a line is black.
Reserved
LB_EL[3:0]. Programs the end line of
the activity window for LB detection
(end of field).
0xDC
Letterbox
Control 1
1
0
1
1
1
0
0
0xDD
Letterbox
Control 2
LB_SL[3:0]. Program the start line of
the activity window for LB detection
(start of field).
0
1
0
0
0xDE
0xDF
0xE0
0xE1
SD Offset
Cb
Reserved
Reserved
Reserved
SD_OFF_CB [7:0]. Adjusts the hue by
selecting the offset for the Cb
channel.
SD_OFF_CR [7:0]. Adjusts the hue by
selecting the offset for the Cr
channel.
SD_SAT_CB [7:0]. Adjusts the
saturation of the picture by
affecting gain on the Cb channel.
SD_SAT_CR [7:0]. Adjusts the
saturation of the picture by
affecting gain on the Cr channel.
NVBEG[4:0]. How many lines after
l
COUNT
rollover to set V high.
NVBEGSIGN
0
0
0
1
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0xE2
SD Offset
Cr
1
0
0
0
0
0
0
0
0xE3
SD
Saturation
Cb
SD
Saturation
Cr
NTSC V Bit
Begin
1
0
0
0
0
0
0
0
Chroma gain = 0 dB
0xE4
1
0
0
0
0
0
0
0
Chroma gain = 0 dB
0
0
1
0
1
NTSC default (BT.656)
0
Set to low when manual
programming
Not suitable for user
programming
No delay
Additional delay by 1 line
1
0
1
NVBEGDELE. Delay V bit going high
by one line relative to NVBEG (even
field).
NVBEGDELO. Delay V bit going high
by one line relative to NVBEG (odd
field).
0
1
No delay
Additional delay by 1 line
0xE5