SDA9410-B13 Datasheet, PDF (69/179 Pages) Micronas – Display Processor and Scan Rate Converter using Embedded DRAM Technology Units

SDA9410
Preliminary Data Sheet
Application modes and memory concept
I²C Bus
parameter
[Default]
SHIFTACT
Sub address
Description
7Fh
Shifting of display raster phase active
1: phase shift in progress
0: phase shift not active
Table 63 Output read I²C Bus parameter
Master slave exchange means an animated exchange of the master and slave picture
source without visible synchronization problems of the deflection PLL compared with a
hard switch between both sources. To avoid this synchronization problem the display
raster phase is slowly shifted to a position that fits to the slave channel sync pulses. Then
the exchange can be done without visible artefacts. For the animation see
"Configuration switch" on page 61.
What to do to perform a master slave switch:
1.I²C Parameter MASLSHFT must be set. Shift process is started.
2.The I²C output signal SHIFTACT must be observed. After setting MASLSHFT is
becomes ’1’ and signalizes that the shift process is active. When it becomes ’0’ the shift
process is finished and the desired phase of the display raster is obtained.
3.At the same time exchanging of master and slave inputs and setting of I²C parameter
MASTSLA must be performed. Now the chip is synchronized to the former slave channel
that now has become the master.
4.At last the I²C Bus parameters MASLSHFT and MASTSLA should be reset.
5.6.8 Refresh and still picture mode
The master and the slave channel picture can be frozen by the I²C Bus parameter
FREEZEM and FREEZES, respectively. The I²C Bus parameters REFRON and
REFRPER may be used to activate a memory refresh for the internal memory.
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