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