adv7189b Analog Devices, Inc., adv7189b Datasheet - Page 49

• Manufacturer Part Number: adv7189b
• Description: Multiformat Sdtv Video Decoder
• Manufacturer: Analog Devices, Inc.

CRC_ENABLE CRC CGMS-A Sequence, Address 0xB2[2]
For certain video sources, the CRC data bits can have an invalid
format. In such circumstances, the CRC checksum validation
procedure can be disabled. The CGMSD bit goes high if the
rising edge of the start bit is detected within a time window.
When CRC_ENABLE is 0, no CRC check is performed.
The CGMSD bit goes high if the rising edge of the start bit
is detected within a time window.
When CRC_ENABLE is 1 (default), CRC checksum is used to
validate the CGMS sequence. The CGMSD bit goes high for a
valid checksum. ADI recommended setting.
Wide Screen Signaling Data
WSS1[7:0], Address 0x91[7:0], WSS2[7:0], Address
0x92[7:0]
Table 58. WSS Access Information
Signal Name
WSS1[7:0]
WSS2[5:0]
Table 59. EDTV Access Information
Signal Name
EDTV1[7:0]
EDTV2[7:0]
EDTV3[7:0]
11.0Ps
Register Location
EDTV 1[7:0]
EDTV 2[7:0]
EDTV 3[7:0]
Register Location
WSS 1[7:0]
WSS 2[5:0]
SEQUENCE
RUN-IN
0
1
2
START
CODE
3
EDTV1[7:0]
4
5
38.4Ps
42.5Ps
0
Figure 32. EDTV Data Extraction
Figure 31. WSS Data Extraction
6
1
7
Rev. B | Page 49 of 104
2
0
WSS1[7:0]
3
1 2 3 4
147d
148d
149d
EDTV2[7:0]
145d
146d
4
5
F igure 31 shows the bit correspondence between the analog
2 1 7 H
video waveform and the WSS1/WSS2 registers. WSS2[7:6]
are undetermined and should be masked out by software.
EDTV Data Registers
EDTV1[7:0], Address 0x93[7:0],
EDTV2[7:0], Address 0x94[7:0],
EDTV3[7:0], Address 0x95[7:0]
F igure 32 shows the bit correspondence between the analog
2 1 8 H
video waveform and the EDTV1/EDTV2/EDTV3 registers.
EDTV3[7:6] are undetermined and should be masked out by
software. EDTV3[5] is reserved for future use and, for now,
contains a 0. The three LSBs of the EDTV waveform are
currently not supported.
6
Address
5
Address
7
6 7
0
0x91
0x92
0x93
0x94
0x95
0
1
WSS2[5:0]
EDTV3[5:0]
1 2
2
3
3
4
4
Register Default Value
Readback Only
Readback Only
Register Default Value
Readback Only
Readback Only
Readback Only
NOT SUPPORTED
5
5
ACTIVE
VIDEO
ADV7189B