參數(shù)資料
型號(hào)： ADV7188
廠商： Analog Devices, Inc.
英文描述： Multiformat SDTV Video Decoder with Fast Switch Overlay Support
中文描述： 標(biāo)清多格式視頻解碼器支持快速開(kāi)關(guān)重疊
文件頁(yè)數(shù)： 64/112頁(yè)
文件大小： 943K
代理商： ADV7188
ADV7188
Table 81. Data Byte Allocation
Raw Information Bytes
Retrieved from the Video Line
1
4
1
4
0
2
0
2
Rev. 0 | Page 64 of 112
2×
GDECAD
0
1
0
1
User Data-Words
(Including Padding)
8
4
4
4
Padding Bytes
0
0
0
2
DC[1:0]
10
01
01
01
Gemstar Bit Names
DID. The data identification value is 0x140 (10-bit value).
Care has been taken that in 8-bit systems, the two LSBs do
not carry vital information.
EP and EP. The EP bit is set to ensure even parity on the
data-word D[8:0]. Even parity means there is always an
even number of 1s within the D[8:0] bit arrangement. This
includes the EP bit. EP describes the logic inverse of EP
and is output on D[9]. The EP is output to ensure that the
reserved codes of 00 and FF cannot happen.
EF. Even field identifier. EF = 1 indicates that the data was
recovered from a video line on an even field.
2×. This bit indicates whether the data sliced was in
Gemstar 1× or 2× format. A high indicates 2× format.
line[3:0]. This entry provides a code that is unique for each
of the possible 16 source lines of video from which
Gemstar data may have been retrieved. Refer to Table 90
and Table 91.
DC[1:0]. Data count value. The number of UDWs in the
packet divided by 4. The number of UDWs in any packet
must be an integral number of 4. Padding is required at the
end, if necessary, as set in ITU-R BT.1364. See Table 81.
The 2× bit determines whether the raw information
retrieved from the video line was 2 or 4 bytes. The state of
the GDECAD bit affects whether the bytes are transmitted
straight (that is, two bytes transmitted as two bytes) or
whether they are split into nibbles (that is, two bytes
transmitted as four half bytes). Padding bytes are then
added where necessary.
CS[8:2]. The checksum is provided to determine the
integrity of the ancillary data packet. It is calculated by
summing up D[8:2] of DID, SDID, the data count byte, and
all UDWs, and ignoring any overflow during the
summation. Since all data bytes that are used to calculate
the checksum have their 2 LSBs set to 0, the CS[1:0] bits
are also always 0.
CS[8] describes the logic inversion of CS[8]. The value
CS[8] is included in the checksum entry of the data packet
to ensure that the reserved values of 0x00 and 0xFF do not
occur. Table 82 to Table 87 outline the possible data
packages.
Gemstar 2× Format, Half-Byte Output Mode
Half-byte output mode is selected by setting CDECAD = 0;
full-byte output mode is selected by setting CDECAD = 1. See
the GDECAD Gemstar Decode Ancillary Data Format,
Address 0x4C [0] section.
Gemstar 1× Format
Half-byte output mode is selected by setting CDECAD = 0,
full-byte output mode is selected by setting CDECAD = 1. See
the GDECAD Gemstar Decode Ancillary Data Format,
Address 0x4C [0] section.
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