I2C READBACK REGISTERS Teletext Becau" />
參數資料
型號： EVAL-ADV7180LQEBZ
廠商： Analog Devices Inc
文件頁數： 77/116頁
文件大?。?/td> 0K
描述： BOARD EVALUATION ADV7180
標準包裝： 1
系列： Advantiv®
主要目的： 視頻，SDTV 視頻解碼器 - NTSC，PAL，SECAM
嵌入式： 否
已用 IC / 零件： ADV7180
主要屬性： CVBS（復合），Y/C（S 視頻）和 YPrPb（元件）輸入
次要屬性： 8 位 ITU-R BT.656 YCrCb 4:2:2 輸出
已供物品： 板
相關產品： ADV7180BCPZ-REEL-ND - IC VIDEO DECODER SDTV 40-LFCSP
ADV7180BSTZ-ND - IC VIDEO DECODER SDTV 64-LQFP
ADV7180BCPZ-ND - IC VIDEO DECODER SDTV 40-LFCSP
Data Sheet
ADV7180
Rev. I | Page 63 of 116
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
detects 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, Address 0x78[7],
User Sub Map, Read Only
When TTXT_AVL is 0, teletext is not detected.
When TTXT_AVL is 1, teletext is detected.
WST Packet Decoding
For WST only, the VDP decodes the magazine and row address
of teletext packets and further decodes 8 × 4 hamming coded
words of the packet. This feature can be disabled using the
WST_PKT_DECODE_DISABLE bit (Bit 3, Register 0x60, user
sub map). This feature is valid for WST only.
WST_PKT_DECODE_DISABLE, Disable Hamming
Decoding of Bytes in WST, Address 0x60[3], User Sub Map
Setting WST_PKT_DECODE_DISABLE to 0 enables hamming
decoding of WST packets.
Setting WST_PKT_DECODE_DISABLE to 1 (default) disables
hamming decoding of WST packets.
For hamming-coded bytes, the dehammed nibbles are output
along with some error information from the hamming decoder
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'}
(Di' – corrected bits, Ei error information).
Table 79. 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
Bad
11
Single error found and corrected
Okay
Table 80 describes the WST packets that are decoded.
Table 80. WST Packet Description
Packet
Byte
Description
Header Packet (X/00)
1st
Magazine number—Dehammed Byte 4
2nd
Row number—Dehammed Byte 5
3rd
Page number—Dehammed Byte 6
4th
Page number—Dehammed Byte 7
5th to 10th
Control bytes—Dehammed Byte 8 to Byte 13
11th to 42nd
Raw data bytes
Text Packets (X/01 to X/25)
1st
Magazine number—Dehammed Byte 4
2nd
Row number—Dehammed Byte 5
3rd to 42nd
Raw data bytes
8/30 (Format 1) Packet
1st
Magazine number—Dehammed Byte 4
Design Code = 0000 or 0001
2nd
Row number—Dehammed Byte 5
UTC
3rd
Design code—Dehammed Byte 6
4th to 10th
Dehammed initial teletext page, Byte 7 to Byte 12
11th to 23rd
UTC bytes—Dehammed Byte 13 to Byte 25
24th to 42nd
Raw status bytes
8/30 (Format 2) Packet
1st
Magazine number—Dehammed Byte 4
Design Code = 0010 or 0011
2nd
Row number—Dehammed Byte 5
PDC
3rd
Design code—Dehammed Byte 6
4th to 10th
Dehammed initial teletext page, Byte 7 to Byte 12
11th to 23rd
PDC bytes—Dehammed Byte 13 to Byte 25
24th to 42nd
Raw status bytes
X/26, X/27, X/28, X/29, X/30, X/311
1st
Magazine number—Dehammed Byte 4
2nd
Row number—Dehammed Byte 5
3rd
Design code—Dehammed Byte 6
4th to 42nd
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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