Datasheet

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10.2 Horizontal Scaling
10.2.1 Registers
SAV EAV
SAV
EAV
Unscaled
Scaled
10.3 Vertical Scaling
10.3.1 Registers
SAV EAV
SAV EAV
SAV EAV
SAV EAV
SAV EAV
SAV EAV
SAV EAV
SAV EAV
SAV
EAV
SAV EAV
SAV EAV
SAV
EAV
SAV EAV
EAV
Unscaled
Scaled
SAV EAV
SAV EAV
SAV EAV
SAV EAV
SAV EAV
SAV EAV
Line n
Line n+1
Line n+4
Line n+7
SAV EAV
SAV EAV
SAV
EAV
SAV EAV
SAV EAV
SAV
EAV
SAV EAV
EAV
Un
Scaled
Line n+2
Line n+3
Line n+5
Line n+6
Line n
Line n+1
Line n+4
Line n+7
Line n+2
Line n+3
Line n+5
Line n+6
SAVSAV
TVP5154
4-CHANNEL LOW-POWER PAL/NTSC/SECAM VIDEO DECODER
WITH INDEPENDENT SCALERS AND FAST LOCK
SLES163A – MARCH 2006 – REVISED JULY 2006
The horizontal scaler uses a 32-phase polymorphic filter. Excellent performance can be achieved by using
the set of coefficients programmed into the 5154 for all scaling ratios.
It is necessary to program the input and output scaling control registers (3AB and 3AD).
Figure 10-1 shows how data is packed horizontally when scaled.
Figure 10-1. Unscaled and Scaled Pixel Data Alignment
The vertical scaler implements a weighted running average filter, which requires the initial weights and the
ratio registers to be configured.
Additionally, it is necessary to program the input and output scaling control registers (3A8, 3A9, and 3AC).
Figure 10-2 shows the active and inactive data lines when scaled vertically.
Figure 10-2. Unscaled and Scaled Vertical Data Formatting
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