I2C READBACK REGISTERS Teletext Because teletext" />
參數(shù)資料
型號(hào)： ADV7184BSTZ
廠商： Analog Devices Inc
文件頁數(shù)： 74/112頁
文件大?。?/td> 0K
描述： IC DECODER VID SDTV MULTI 80LQFP
標(biāo)準(zhǔn)包裝： 1
類型： 視頻解碼器
應(yīng)用： 投影儀，錄音機(jī)，安全
電壓 - 電源，模擬： 3.15 V ~ 3.45 V
電壓 - 電源，數(shù)字： 1.65 V ~ 2 V
安裝類型： 表面貼裝
封裝/外殼： 80-LQFP
供應(yīng)商設(shè)備封裝： 80-LQFP（14x14）
包裝： 托盤
ADV7184
Rev. A | Page 64 of 112
I2C READBACK REGISTERS
Teletext
Because teletext is a high data rate standard, the decoded bytes
are available only as ancillary data. However, a TTXT_AVL bit
is provided in I2C so that the user can check whether the VDP
has detected teletext. Note that the TTXT_AVL bit is a plain
status bit and does not use the protocol identified in the I2C
Interface section.
TTXT_AVL, Teletext Detected Status Bit,
Address 0x78 [7], User Sub Map, Read Only
0—Teletext was not detected.
1—Teletext was detected.
WST Packet Decoding
For WST only, the VDP decodes the magazine and row address
of WST teletext packets and further decodes the packet’s 8 × 4
hamming coded words. This feature can be disabled by using
the WST_PKT_ DECOD_ DISABLE bit (Bit 3, Register 0x60,
user sub map). This feature is only valid for WST.
WST_PKT_DECOD_DISABLE, Disable Hamming
Decoding of Bytes in WST, Address 0x60 [3], User Sub Map
0—Enables hamming decoding of WST packets.
1 (default)—Disables hamming decoding of WST packets.
For hamming coded bytes, the dehammed nibbles, along with error
information from the hamming decoder, are output as follows:
Input hamming coded byte: {D3, P3, D2, P2, D1, P1, D0, P0}
(bits in decoded order)
Output dehammed byte: {E1, E0, 0, 0, D3', D2', D1', D0'}
(where Di' is the corrected bit, and Ei represents the error
information).
Table 77. Explanation of Error Bits
in the Dehammed Output Byte
E [1:0]
Error Information
Output Data Bits
in Nibble
00
No errors detected
Okay
01
Error in P4
Okay
10
Double error
Not okay
11
Single error found and corrected
Okay
The types of WST packets that are decoded are described in
Table 78. WST Packet Description
Packet
Byte
Description
1st byte
Magazine number—dehammed Byte 4
2nd byte
Row number—dehammed Byte 5
3rd byte
Page number—dehammed Byte 6
4th byte
Page number—dehammed Byte 7
5th to 10th byte
Control Bytes—dehammed Byte 8 to Byte 13
Header Packet
(X/00)
11th to 42nd byte
Raw data bytes
1st byte
Magazine number—dehammed Byte 4
2nd byte
Row number—dehammed Byte 5
Text Packets
(X/01 to X/25)
3rd to 42nd byte
Raw data bytes
1st byte
Magazine number—dehammed Byte 4
2nd byte
Row number—dehammed Byte 5
3rd byte
Design code—dehammed Byte 6
4th to 10th byte
Dehammed Initial teletext page, Byte 7 to Byte 12
11th to 23rd byte
UTC bytes—dehammed Byte 13 to Byte 25
8/30 (Format 1) packet
Design Code = 0000 or 0001
UTC
24th to 42nd byte
Raw status bytes
1st byte
Magazine number—dehammed Byte 4
2nd byte
Row number—dehammed Byte 5
3rd byte
Design code—dehammed Byte 6
4th to 10th byte
Dehammed Initial teletext page, Byte 7 to Byte 12
11th to 23rd byte
PDC bytes—dehammed Byte 13 to Byte 25
8/30 (Format 2) packet
Design Code = 0010 or 0011
PDC
24th to 42nd byte
Raw status bytes
1st byte
Magazine number—dehammed Byte 4
2nd byte
Row number—dehammed Byte 5
3rd byte
Design code—dehammed Byte 6
X/26, X/27, X/28, X/29, X/30, X/311
4th to 42nd byte
Raw data bytes
1 For X/26, X/28, and X/29, further decoding needs 24 × 18 hamming decoding. Not supported at present.
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