SDA9489X Datasheet, PDF (39/102 Pages) List of Unclassifed Manufacturers – PIP IV Advanced SOPHISTICUS High-End Picture-In-Picture ICs

SDA 9489X
SDA 9589X
Preliminary Data Sheet
System Description
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 I²C 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 Closed Caption
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
as others can
XDS-Filter
be filtered
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(both fields) is sliced
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class filter is selected,
interface. When one or
all incoming data
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.
4.11.2 Widescreen Signalling (WSS)
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.
4.11.3 Indication Of New Data
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
Micronas
4-39