參數(shù)資料
型號： ADV7184
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(guān)重疊
文件頁數(shù)： 61/108頁
文件大?。?/td> 925K
代理商： ADV7184
ADV7184
Table 80. GS /VPS/PDC/UTC Readback Registers
1
Signal Name
GS_VPS_PDC_UTC_BYTE_0[7:0]
GS_VPS_PDC_UTC_BYTE_1[7:0]
GS_VPS_PDC_UTC_BYTE_2[7:0]
GS_VPS_PDC_UTC_BYTE_3[7:0]
VPS_PDC_UTC_BYTE_4[7:0]
VPS_PDC_UTC_BYTE_5[7:0]
VPS_PDC_UTC_BYTE_6[7:0]
VPS_PDC_UTC_BYTE_7[7:0]
VPS_PDC_UTC_BYTE_8[7:0]
VPS_PDC_UTC_BYTE_9[7:0]
VPS_PDC_UTC_BYTE_10[7:0]
VPS_PDC_UTC_BYTE_11[7:0]
VPS_PDC_UTC_BYTE_12[7:0]
Rev. 0 | Page 61 of 108
Register Location
VDP_GS_VPS_PDC_UTC_0[7:0]
VDP_GS_VPS_PDC_UTC_1[7::0]
VDP_GS_VPS_PDC_UTC_2[7:0]
VDP_GS_VPS_PDC_UTC_3[7:0]
VDP_VPS_PDC_UTC_4[7:0]
VDP_VPS_PDC_UTC_5[7:0]
VDP_VPS_PDC_UTC_6[7:0]
VDP_VPS_PDC_UTC_7[7:0]
VDP_VPS_PDC_UTC_8[7:0]
VDP_VPS_PDC_UTC_9[7:0]
VDP_VPS_PDC_UTC_10[7:0]
VDP_VPS_PDC_UTC_11[7:0]
VDP_VPS_PDC_UTC_12[7:0]
Address (User Sub Map)
Dec
132d
133d
134d
135d
136d
137d
138d
139d
140d
141d
142d
143d
144d
Hex
0x84
0x85
0x86
0x87
0x88
0x89
0x8A
0x8B
0x8C
0x8D
0x8E
0x8F
0x90
1
The register is a readback register; default value does not apply.
PDC/UTC
PDC and UTC are data transmitted through teletext packet
8/30 format 2 (magazine 8, row 30, design_code 2 or 3), and
packet 8/30 format 1 (magazine 8, row 30, design_code 0 or 1).
Hence, if PDC or UTC data is to be read through I
2
C, the
corresponding teletext standard (WST or PAL System B) should
be decoded by VDP. The whole teletext decoded packet is
output on the ancillary data stream. The user can look for the
magazine number, row number and design_code and qualify
the data as PDC, UTC or none of these.
If PDC/UTC packets have been identified, Byte 0 to Byte 12 are
updated to the GS_VPS_PDC_UTC_0 to VPS_PDC_UTC_12
registers, and the GS_VPS_PDC_UTC_AVL bit set. The full
packet data is also available in the ancillary data format.
Note that the data available in the I
2
C register depends on the
status of the WST_PKT_DECODE_DISABLE bit (Bit 3,
subaddress 0x60, User Sub Map).
VBI System 2
The user has an option of using a different VBI data slicer called
VBI System 2. This data slicer is used to decode Gemstar and
Closed Caption VBI signals only.
Using this system, the Gemstar data is only available in the
ancillary data stream. A special mode enables one line of data to
be read back via I
2
C. For details on how to get I
2
C readback
when using the VBI System 2 data slicer, see the ADI
applications note on ADV7184 VBI processing.
Gemstar Data Recovery
The Gemstar-compatible data recovery block (GSCD) supports
1× and 2× data transmissions. In addition, it can serve as a
closed caption decoder. Gemstar-compatible data transmissions
can occur only in NTSC. Closed caption data can be decoded in
both PAL and NTSC.
The block is configured via I
2
C in the following ways:
GDECEL[15:0] allows data recovery on selected video lines
on even fields to be enabled and disabled.
GDECOL[15:0] enables the data recovery on selected lines
for odd fields.
GDECAD configures the way in which data is embedded
in the video data stream.
The recovered data is not available through I
2
C, but is inserted
into the horizontal blanking period of an ITU-R BT656-
compatible data stream. The data format is intended to comply
with the recommendation by the International
Telecommunications Union, ITU-R BT.1364. For more
information, see the ITU website at www.itu.ch. See Figure 41.
GDE_SEL_OLD_ADF, Address 0x4C [3], User Map
The ADV7184 has a new ancillary data output block that can
be used by the VDP data slicer and the VBI System 2 data
slicer. The new ancillary data formatter is used by setting
GDE_SEL_OLD_ADF = 0 (this is the default setting). If this bit
is set low, refer to Table 69 and Table 70 for information about
how the data is packaged in the ancillary data stream.
To use the old ancillary data formatter (to be backward-
compatible with the ADV7183B), set GDE_SEL_OLD_ADF = 1.
The ancillary data format in this section refers to the ADV7183B-
compatible ancillary data formatter.
0 (default)—Enables new ancillary data system (for use with
VDP and VBI System 2).
1—Enables old ancillary data system (for use with VBI System 2
only; ADV7183B-compatible).
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參數(shù)描述
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