SDA9288X Datasheet, PDF (15/46 Pages) Siemens Semiconductor Group – Single Chip PIP System

SDA 9288X
Having different line standards in inset and parent channels we have a so called mixed
mode display. It causes deformations in the aspect ratio of the inset picture. A special
mixed mode display is available for the picture size 1/9 (MIXDIS):
– Parent channel 625 lines, inset channel 525 lines: The inset picture is shifted down by
6 lines. By performing this shifting the centers of the inset pictures have the same
position for both line standards.
– Parent channel 525 lines, inset channel 625 lines: The inset picture gets a reduced
line number of 76. The first and the last 6 lines are omitted. This way the inset picture
size is the same as for 525 lines inset signals. The display shows the center part of
the original picture.
Synchronization of memory reading with the parent channel is achieved by processing
the parent horizontal and vertical synchronization signals in the same way as described
for the inset channel. The synchronization signals are fed to the IC at pin HP/SCP for
horizontal synchronization and pin VP for vertical synchronization. In the same way as
described for the inset channel the burst gate of the sandcastle signal can be used for
horizontal synchronization. In scan conversion systems also the inputs HPD/SCI and
VPD/VI are available if the input HVI is activated for inset synchronization.
Semiconductor Group
15
03.96