SDA9400 Datasheet, PDF (31/94 Pages) Micronas – Scan Rate Converter using Embedded DRAM Technology Units

SDA 9400
The motion detection calculates two field difference signals and one frame difference signal. The
sensitivity of the field difference can be changed by the parameter SVALFI, and the sensitivity of the
frame difference can be changed by the parameter SVALFR.
Parameter SVALFI and SVALFR
Parameter
SVALFI,
SVALFR
0 (minimum value)
maximum sensitivity field/frame
difference
3 (maximum value)
minimum sensitivity field/frame
difference
The output values of the field and frame difference blocks are mapped to 1 bit signals by three look
up tables. The thresholds of the look up tables are programmable. THFI3, THFI2, THFI1, THFI0
control both look up tables for the field differences LUTFI. THFR3, THFR2, THFR1, THFR0 control
the look up table for the frame difference LUTFR. The thresholds are selected by the corresponding
line difference signals LDACT and LDDEL, respectively as described before.
Parameter THFI3, THFI2, THFI1, THFI0
THFI0
THFI1
THFI2
4
5
5
THFI3
5
(I²C bus)
field difference
line difference
2
THFI0...15 THFI1...31 THFI2...31 THFI3...31
1
0...THFI0-1 0...THFI1-1 0...THFI2-1 0...THFI3-1
0
0
1
2
3
1
out
LUTFI
Parameter THFR3, THFR2, THFR1, THFR0
THFR0
THFR1
4
4
THFR2
5
THFR3 (I²C bus)
5
frame difference
line difference
2
THFR0...15 THFR1...15 THFR2...31 THFR3...31
1
0...THFR0-1 0...THFR1-1 0...THFR2-1 0...THFR3-1
0
0
1
2
3
1
out
LUTFR
The output of the look up table LUTFI FID1, the output of the LUTFR FRD, the output of the
threshold FID3 and the output of the threshold FRD3 are fed to a multiplexer. The output of the
multiplexer is fed to the global motion detection block. The multiplexer can be switched using the I²C
bus parameter SWGM. The output of the threshold FID3 is in addition fed to the movie mode and
phase detection block (see also Global motion, movie mode and phase detection on page 33). The
FID3 and FRD3 signal are also one bit signals. Both signals are independent of the parameters
described up to now. The FID3 signal depends only on the threshold THRMOV and the FRD3 signal
depends only on the threshold THRGM. So it is possible to optimise the movie mode and global
Micronas
31
Preliminary Data Sheet