參數(shù)資料
型號(hào)： SDA9589X
廠商： Electronic Theatre Controls, Inc.
英文描述： PIP IV Advanced SOPHISTICUS High-End Picture-In-Picture ICs
中文描述： 畫(huà)中畫(huà)四先進(jìn)SOPHISTICUS高端畫(huà)中畫(huà)，圖像芯片
文件頁(yè)數(shù)： 39/102頁(yè)
文件大?。?/td> 2306K
代理商： SDA9589X
Micronas
4-39
SDA 9489X
SDA 9589X
System Description
Preliminary Data Sheet
4.11
Data Slicer
Depending on
SERVICE
, Closed Caption data (’Line 21’) or WSS (Widescreen
signalling) is sliced by the digital data slicer and can be read out from I
2
C interface. The
line number of the sliced data is selectable with
SELLNR
. Therefore WSS and CC can
be processed in different regions (e.g. CC with PAL M). The Closed Caption data is
assumed to conform with the ITU standards EIA-608 and EIA-744-A. WSS data is
assumed to conform with ETS 300 294 (2nd edition, May 1996).
4.11.1
The closed caption data stream contains different data services. In field 1 (line 21) the
captions CC1 and CC2 and the text pages T1 and T2 are transmitted whereas in field 2
(line 284) caption CC3, CC4, text T3, T4 and the XDS data are transmitted. For more
information please refer to the above mentioned standards.
Raw CC as well as prefiltered data is provided alternatively. With the built-in
programmable XDS-Filter (
XDSCLS
), the program-rating information (’V-chip’) as well
as others can be filtered out. The XDS filter reduce traffic on the I
2
C bus and save
calculation power of the main controller. If no class filter is selected, all incoming data
(both fields) is sliced and provided by the I
2
C interface. When one or more class filters
are chosen, only data in field 2 is sliced. Any combination of class filters is allowed. Each
’CLASS’ is divided into ’TYPES’ which can be sorted out by the XDS-secondary filter
(
XDSTPE
). Any combination of type filter is allowed. Some type filter require an
appropriate class filter.
Closed Caption
4.11.2
In WSS mode (
SERVICE
=’1’) no filtering is possible. All sliced data is passed to the
output registers. In this case
XDSTPE
selects the field number of the data to be sliced.
In Europe WSS carries for instance information about aspect ratio and movie mode.
Widescreen Signalling (WSS)
4.11.3
The sliced and possibly filtered data is available in
DATAA
and
DATAB
. The
corresponding status bits are
DATAV
and
SLFIELD
. When new data were received,
DATAV
becomes ’1’ and the controller must read
DATAA
,
DATAB
and the status
information. After both data bytes were read
DATAV
becomes ’0’ until new data arrives.
It must be ensured that the data polling is activated once per field (16.7 or 20 ms) or
every second field (33.3 or 40 ms), depending on the slicer configuration and inset field
frequency. The field number of the data in
DATAA
and
DATAB
can be found in
SLFIELD
. If one or more XDS-class filter are activated,
SLFIELD
contains always ’1’.
Additionally pin 10 (INT) may flag that new data is received. Default this pin is in tri-state
mode to be compatible with
Micronas'
SDA9388X/9389X PIP devices. It can also be
configured by
IRQCON
to output a single short pulse when new data is available or
behave equal to
DATAV
. In the last case the output remains active until the two data
Indication Of New Data
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