ADV7181B
Rev. B | Page 84 of 100
Bits
Subaddress
Register
Bit Description
7
6 5
4
3 2
1
0 Comments Notes
0x99 CCAP1
(Read Only)
CCAP1[7:0]
Closed caption data register.
x
x
x
x
x
x
x
x
CCAP1[7] contains parity
bit for byte 0
0x9A CCAP2
(Read Only)
CCAP2[7:0]
Closed caption data register.
x
x
x
x
x
x
x
x
CCAP2[7] contains parity
bit for byte 0
0x9B
Letterbox 1
(Read Only)
LB_LCT[7:0]
Letterbox data register.
x
x
x
x
x
x
x
x
Reports the number of
black lines detected at the
top of active video
0x9C
Letterbox 2
(Read Only)
LB_LCM[7:0]
Letterbox data register.
x
x x x
x x x x
Reports the number of
black lines detected in the
bottom half of active video
if subtitles are detected
0x9D
Letterbox 3
(Read Only)
LB_LCB[7:0]
Letterbox data register.
x
x x x
x x x x
Reports the number of
black lines detected at the
bottom of active video.
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.
Reserved.
0
0
Set as default
0
Turn off CRC check
CRC_ENABLE. Enable CRC checksum
decoded from CGMS packet to
validate CGMSD.
1
CGMSD goes high with
valid checksum
0xB2 CRC
Enable
Write
Register
Reserved.
0
0
0
1
1
Set as default
0 0 0 0 No
connection
0 0 0 1 AIN2
0 0 1 0 No
connection
0 0 1 1 No
connection
0 1 0 0 AIN4
0 1 0 1 AIN6
0 1 1 0 No
connection
0 1 1 1 No
connection
1 0 0 0 No
connection
1 0 0 1 AIN1
1 0 1 0 No
connection
1 0 1 1 No
connection
1 1 0 0 AIN3
1 1 0 1 AIN5
1 1 1 0 No
connection
ADC0_SW[3:0]. Manual muxing
control for ADC0.
1 1 1 1 No
connection
SETADC_sw_
man_en = 1.
0
0 0 0
No
connection
0
0 0 1
No
connection
0
0 1 0
No
connection
0
0 1 1
No
connection
0
1
0 0
AIN4
0
1
0 1
AIN6
0
1 1 0
No
connection
0
1 1 1
No
connection
1
0 0 0
No
connection
1
0 0 1
No
connection
1
0 1 0
No
connection
1
0 1 1
No
connection
1
1
0 0
AIN3
1
1
0 1
AIN5
1
1 1 0
No
connection
0xC3 ADC
SWITCH 1
ADC1_SW[3:0]. Manual muxing
control for ADC1.
1
1 1 1
No
connection
SETADC_sw_
man_en = 1.
