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ADV7181B
Subaddress
Register
0x99
CCAP1
(Read Only)
0x9A
CCAP2
(Read Only)
0x9B
Letterbox 1
(Read Only)
0x9C
Letterbox 2
(Read Only)
0x9D
Letterbox 3
(Read Only)
0xB2
CRC Enable
Write
Register
0xC3
ADC
SWITCH 1
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Bit Description
CCAP1[7:0]
Closed caption data register.
CCAP2[7:0]
Closed caption data register.
LB_LCT[7:0]
Letterbox data register.
LB_LCM[7:0]
Letterbox data register.
LB_LCB[7:0]
Letterbox data register.
Reserved.
CRC_ENABLE. Enable CRC checksum
decoded from CGMS packet to
validate CGMSD.
Reserved.
ADC0_SW[3:0]. Manual muxing
control for ADC0.
ADC1_SW[3:0]. Manual muxing
control for ADC1.
Bits
7 6
5
4 3
2
1
0
x x
x
x
x
x
x
x
x x
x
x
x
x
x
x
x x
x
x
x
x
x
x
x x
x
x x
x
x
x
x x
x
x x
x
x
x
0
0
0
1
0 0
0
1
1
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
0 0
0
0
0 0
0
1
0 0
1
0
0 0
1
1
0 1
0
0
0 1
0
1
0 1
1
0
0 1
1
1
1 0
0
0
1 0
0
1
1 0
1
0
1 0
1
1
1 1
0
0
1 1
0
1
1 1
1
0
1 1
1
1
Rev. B | Page 84 of 100
Comments
Notes
CCAP1[7] contains parity
bit for byte 0
CCAP2[7] contains parity
bit for byte 0
Reports the number of
This feature
black lines detected at the
examines the active
top of active video
video at the start
and at the end of
Reports the number of
each field. It enables
black lines detected in the
format detection
bottom half of active video
even if the video is
if subtitles are detected
not accompanied
Reports the number of
by a CGMS or WSS
black lines detected at the
sequence.
bottom of active video.
Set as default
Turn off CRC check
CGMSD goes high with
valid checksum
Set as default
No connection
SETADC_sw_
man_en = 1.
AIN2
No connection
No connection
AIN4
AIN6
No connection
No connection
No connection
AIN1
No connection
No connection
AIN3
AIN5
No connection
No connection
No connection
SETADC_sw_
man_en = 1.
No connection
No connection
No connection
AIN4
AIN6
No connection
No connection
No connection
No connection
No connection
No connection
AIN3
AIN5
No connection
No connection
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