ADV7181 AD [Analog Devices], ADV7181 Datasheet - Page 48

• Manufacturer Part Number: ADV7181
• Description: Multiformat SDTV Video Decoder
• Manufacturer: AD [Analog Devices]

ADV7181B
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.
Table 58. CGMS Access Information
Signal Name
CGMS1[7:0]
CGMS2[7:0]
CGMS3[3:0]
Table 59. CCAP Access Information
Signal Name
CCAP1[7:0]
CCAP2[7:0]
+100 IRE
+70 IRE
–40 IRE
0 IRE
50 IRE
40 IRE
Register Location
CGMS 1 [7:0]
CGMS 2 [7:0]
CGMS 3 [3:0]
Register Location
CCAP 1 [7:0]
CCAP 2 [7:0]
FREQUENCY = F
11.2µs
REFERENCE COLOR BURST
AMPLITUDE = 40 IRE
10.5
10.003µs
(9 CYCLES)
±
2.235µs
0.25µs
SC
27.382µs
REF
= 3.579545MHz
±
20ns
Figure 33. Closed Caption Data Extraction
0
Figure 32. CGMS Data Extraction
1
(CLOCK RUN-IN)
Rev. 0 | Page 48 of 96
150d
151d
152d
OF 0.5035MHz
2
153d
154d
7 CYCLES
CGMS1[7:0]
12.91µs
3
Address
4
Address
5
0x96
0x97
0x98
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.
6
0x99
0x9A
7
A
R
S
T
T
0
49.1µs
0
Register Default Value
Readback Only
Readback Only
Readback Only
CCAP1[7:0]
1
1
2 3 4 5 6 7 0 1 2 3 4 5 6 7
±
BYTE 0
2
0.5µs
CGMS2[7:0]
Register Default Value
Readback Only
Readback Only
3
33.764µs
4
P
A
R
T
Y
I
5
CCAP2[7:0]
6
BYTE 1
CRC SEQUENCE
7
0
A
R
P
T
Y
I
CGMS3[3:0]
1
2
3