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ADV7181BBCPZ Datasheet(PDF) 48 Page - Analog Devices

Part # ADV7181BBCPZ
Description  Multiformat SDTV Video Decoder
PDF  96 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADV7181BBCPZ Datasheet(HTML) 48 Page - Analog Devices

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ADV7181B
Rev. 0 | Page 48 of 96
CGMS Data Registers
CGMS1[7:0], Address 0x96 [7:0],
CGMS2[7:0], Address 0x97 [7:0],
CGMS3[7:0], Address 0x98 [7:0]
Figure 32 shows the bit correspondence between the analog
video waveform and the CGMS1/CGMS2/CGMS3 registers.
CGMS3[7:4] are undetermined and should be masked out by
software.
Closed Caption Data Registers
CCAP1[7:0], Address 0x99 [7:0],
CCAP2[7:0], Address 0x9A [7:0]
Figure 33 shows the bit correspondence between the analog
video waveform and the CCAP1/CCAP2 registers.
CCAP1[7] contains the parity bit from the first word.
CCAP2[7] contains the parity bit from the second word.
Refer to the GDECAD Gemstar Decode Ancillary Data Format,
Address 0x4C [0] section.
01
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
CGMS2[7:0]
CGMS3[3:0]
CGMS1[7:0]
REF
+100 IRE
+70 IRE
0 IRE
–40 IRE
11.2
µs
49.1
µs
± 0.5µs
CRC SEQUENCE
2.235
µs
± 20ns
Figure 32. CGMS Data Extraction
Table 58. CGMS Access Information
Signal Name
Register Location
Address
Register Default Value
CGMS1[7:0]
CGMS 1 [7:0]
150d
0x96
Readback Only
CGMS2[7:0]
CGMS 2 [7:0]
151d
0x97
Readback Only
CGMS3[3:0]
CGMS 3 [3:0]
152d
0x98
Readback Only
0
REFERENCE COLOR BURST
(9 CYCLES)
FREQUENCY = FSC = 3.579545MHz
AMPLITUDE = 40 IRE
1
CCAP1[7:0]
7 CYCLES
OF 0.5035MHz
(CLOCK RUN-IN)
CCAP2[7:0]
2 3 4 5 6 7 0 1 2 3 4 5 67
P
A
R
I
T
Y
S
T
A
R
T
P
A
R
I
T
Y
BYTE 1
BYTE 0
33.764
µs
10.003
µs
10.5
± 0.25µs
12.91
µs
27.382
µs
50 IRE
40 IRE
Figure 33. Closed Caption Data Extraction
Table 59. CCAP Access Information
Signal Name
Register Location
Address
Register Default Value
CCAP1[7:0]
CCAP 1 [7:0]
153d
0x99
Readback Only
CCAP2[7:0]
CCAP 2 [7:0]
154d
0x9A
Readback Only



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