ADV8003 Hardware Manual
Rev. B, August 2013
121
2.2.8.3.
SPI Data Extraction
If there is not an input video data bus which can provide the ancillary data, it may be serialized and sent to the part via a SPI master. The
ADV8003 contains a dedicated SPI slave for receiving VBI data. The SPI interface receives serialized ancillary data bytes. All of the
ancillary data packets must be encoded, including the preamble. A high to low transition on the VBI_CS line indicates the start of a new
byte. As the bytes are directly encoded ancillary data, the same decoder described in Section
2.2.8.2 for ancillary data can be used to
extract the VBI data. Only modes 0 and 3 are supported by the SPI slave and, therefore, the SPI master must use one of these modes.
2.2.8.4.
VBI Data Delay
Once the VBI data has been decoded for each of the supported standards, it is latched and delayed by the desired amount. The delay on
the VBI data is measured in frames and is controllable in the range 0 ≤ delay ≤ 3 frames. The data can be delayed on either the rising or
falling edge of the input VSync. The output VBI data is muxed directly with the VBI data from the encoder register map before being
output by the encoder.
vbi_src
, IO Map,
Address 0x1A4C[7]
This bit is used to choose the source of the VBI data.
Function
vbi_src
Description
0
VBI data from ancillary input
1
VBI data from SPI input
ccap_odd_en
, IO Map,
Address 0x1A4C[3]
This bit is used to enable/disable closed caption data extraction on the odd field.
Function
ccap_odd_en
Description
0
Disable closed caption data extraction on odd field
1
Enable closed caption data extraction on odd field
ccap_even_en
, IO Map,
Address 0x1A4C[2]
This bit is used to enable/disable closed caption data extraction on the even field.
Function
ccap_even_en
Description
0
Disable closed caption data extraction on even field
1
Enable closed caption data extraction on even field
cgms_anc_en
, IO Map,
Address 0x1A4C[1]
This bit is used to enable/disable CGMS data extraction on the even field.
Function
cgms_anc_en
Description
0
Disable CGMS data extraction on even field
1
Enable CGMS data extraction on even field
wss_anc_en
, IO Map,
Address 0x1A4C[0]
This bit is used to enable/disable WSS data extraction on the even field.
Содержание ADV8003
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