adv7181b Analog Devices, Inc., adv7181b Datasheet - Page 48

• Manufacturer Part Number: adv7181b
• Description: Multiformat Sdtv Video Decoder
• Manufacturer: Analog Devices, Inc.

ADV7181B
Table 57. WSS Access Information
Signal Name
WSS1[7:0]
WSS2[5:0]
Table 58. EDTV Access Information
Signal Name
EDTV1[7:0]
EDTV2[7:0]
EDTV3[7:0]
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.
+100 IRE
+70 IRE
–40 IRE
0 IRE
Register Location
WSS 1[7:0]
WSS 2[5:0]
Register Location
EDTV 1[7:0]
EDTV 2[7:0]
EDTV 3[7:0]
11.2μs
0
1
2.235μs
2
REF
3
±
EDTV1[7:0]
4
20ns
5
0
Figure 32. CGMS Data Extraction
6
Figure 31. EDTV Data Extraction
1
7
Rev. B | Page 48 of 100
2
0
CGMS1[7:0]
1 2 3 4
3
EDTV2[7:0]
145d
146d
147d
148d
149d
4
5
5
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
Address
Address
6 7
7
0x91
0x92
0x93
0x94
0x95
0
0 1 2
49.1μs
EDTV3[5:0]
1
±
2
0.5μs
CGMS2[7:0]
3
3
4
Register Default Value
Readback only
Readback only
Register Default Value
Readback only
Readback only
Readback only
NOT SUPPORTED
4
5
5
6
CRC SEQUENCE
7
0
CGMS3[3:0]
1
2
3