參數(shù)資料
型號： ADV7188
廠商： Analog Devices, Inc.
英文描述： Multiformat SDTV Video Decoder with Fast Switch Overlay Support
中文描述： 標清多格式視頻解碼器支持快速開關重疊
文件頁數(shù)： 52/112頁
文件大?。?/td> 943K
代理商： ADV7188
ADV7188
VDP Ancillary Data Output
Reading the data back via I
2
C may not be feasible for VBI data
standards with high data rates (for example, teletext). An
alternative is to place the sliced data in a packet in the line
blanking of the digital output CCIR656 stream. This is available
for all standards sliced by the VDP module.
Rev. 0 | Page 52 of 112
When data has been sliced on a given line, the corresponding
ancillary data packet is placed immediately after the next EAV
code that occurs at the output (that is, data sliced from multiple
lines are not buffered up and then emitted in a burst). Note that
the line number on which the packet is placed differs from the
line number on which the data was sliced due to the vertical
delay through the comb filters.
The user can enable or disable the insertion of VDP decoded
results into the 656 ancillary streams by using the
ADF_ENABLE bit.
ADF_ENABLE Enable Ancillary Data Output Through 656
Stream, Address 0x62 [7], User Sub Map
0
(default)—Disables insertion of VBI decoded data into
ancillary 656 stream.
1—Enables insertion of VBI decoded data into ancillary 656
stream.
The user may select the data identification word (DID) and the
secondary data identification word (SDID) through programming
the ADF_DID[4:0] and ADF_SDID[5:0] bits respectively as
explained below.
ADF_DID[4:0] User Specified Data ID Word in Ancillary
Data, Address 0x62 [4:0], User Sub Map
This bit selects the data ID word to be inserted in the ancillary
data stream with the data decoded by the VDP.
The default value of ADF_DID [4:0]is 10101.
ADF_SDID[5:0] User Specified Secondary Data ID Word in
Ancillary Data, Address 0x63 [5:0], User Sub Map
These bits select the secondary data ID word to be inserted in
the ancillary data stream with the data decoded by the VDP.
The default value of ADF_SDID [5:0]is 101010.
DUPLICATE_ADF Enable Duplication/Spreading of
Ancillary Data over Y and C Buses, Address 0x 63 [7], User
Sub Map
This bit determines whether the ancillary data is duplicated
over both Y and C buses or if the data packets are spread
between the two channels.
0
(default)—The ancillary data packet is spread across the Y and
C data streams.
1—The ancillary data packet is duplicated on the Y and C data
streams.
ADF_MODE [1:0] Determine the Ancillary Data Output
Mode, Address 0x62 [6:5], User Sub Map
These bits determine if the ancillary data output mode is in byte
mode or nibble mode.
ADF_MODE
[1:0]
00 (default)
01
10
Description
Nibble mode.
Byte mode, no code restrictions.
Byte mode but 0x00 and 0xFF prevented (0x00
replaced by 0x01, 0xFF replaced by 0xFE)
Reserved.
11
The ancillary data packet sequence is explained in Table 68 and
Table 69. The nibble output mode is the default mode of output
from the ancillary stream when ancillary stream output is
enabled. This format is in compliance with ITU-R BT.1364.
Some definitions of the abbreviations used in Table 68 and
Table 69 are shown below:
EP.
Even parity for bits B8 to B2. This means that the parity
bit EP is set so that an even number of 1s are in bits in B8
to B2, including the parity bit, D8.
CS.
Checksum word. The CS word is used to increase
confidence of the integrity of the ancillary data packet
from the DID, SDID, and DC through user data-words
(UDWs). It consists of 10 bits: a 9-bit calculated value and
B9 as the inverse of B8. The checksum value B8 to B0 is
equal to the 9 LSBs of the sum of the 9 LSBs of the DID,
SDID, and DC and all UDWs in the packet. Prior to the
start of the checksum count cycle all checksum and carry
bits are pre-set to zero. Any carry resulting from the
checksum count cycle is ignored.
EP.
The MSB B9 is the inverse EP. This ensures that
restricted codes 0x00 and 0xFF do not occur.
Line_number [9:0].
The line number of the line that
immediately precedes the ancillary data packet. The line
number is as per the numbering system in ITU-R BT.470.
The line number runs from 1 to 625 in a 625 line system
and from 1 to 263 in a 525 line system. Note the line
number on which the packet is output differs from the line
number on which the VBI data was sliced due to the
vertical delay through the comb filters.
Data Count.
The data count specifies the number of
UDWs in the ancillary stream for the standard. The total
number of user data-words = 4 × Data Count. Padding
words may be introduced to make the total number of
UDWs divisible by four.
相關PDF資料
PDF描述
ADV7189B Multiformat SDTV Video Decoder
ADV7189BBSTZ268H Multiformat SDTV Video Decoder
ADV7189BKSTZ10F Multiformat SDTV Video Decoder
ADV7189 Multiformat SDTV Video Decoder
ADV7189KST Multiformat SDTV Video Decoder
相關代理商/技術參數(shù)
參數(shù)描述
ADV7188BSTZ 功能描述:IC DECODER VID MULTIFORM 80LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝:模塊 包裝:散裝 其它名稱:Q4645799
ADV7189 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat SDTV Video Decoder
ADV7189B 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat SDTV Video Decoder
ADV7189BBSTZ 功能描述:IC VIDEO DECODER SDTV 80-LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝:模塊 包裝:散裝 其它名稱:Q4645799
ADV7189BBSTZ268H 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat SDTV Video Decoder
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