saa7114 NXP Semiconductors, saa7114 Datasheet - Page 122

• Manufacturer Part Number: saa7114
• Description: Pal/ntsc/secam Video Decoder With Adaptive Pal/ntsc Combfilter, Vbi-data Slicer And High Performance Scaler
• Manufacturer: NXP Semiconductors

Philips Semiconductors
SAA7114_3
Product data sheet
11.4.1 Trigger condition
11.4.2 Maximum zoom factor
11.4 Scaler and interfaces
Table 131
The ratio is defined as:
In the following settings the VBI data slicer is inactive. To activate the VBI data slicer,
VITX[1:0] 86h[7:6] has to be set to ‘11’. Depending on the VBI data slicer settings, the
sliced VBI data is inserted after the end of the scaled video lines, if the regions of VBI data
slicer and scaler overlaps.
To compensate the running-in of the vertical scaler, the vertical input window lengths are
extended by 2 lines to 290 lines, respectively 242 lines for XS, but the scaler increment
calculations are done with 288 lines, respectively 240 lines.
For trigger condition STRC[1:0] 90h[1:0] not equal to ‘00’.
If the value of (YO + YS) is greater than or equal to 262 (NTSC), respectively 312 (PAL)
the output field rate is reduced to 30 Hz, respectively 25 Hz.
Horizontal and vertical offsets (XO and YO) have to be used to adjust the displayed video
in the display window. As this adjustment is application dependent, the listed values are
only dummy values.
The maximum zoom factor is dependent on the back-end data rate and therefore
back-end clock and data format dependent (8-bit or 16-bit output). The maximum
horizontal zoom is limited to approximately 3.5, due to internal data path restrictions.
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prsc = prescale ratio
fisc = fine scale ratio
vsc = vertical scale ratio
shows some examples for the scaler programming with:
Rev. 03 — 17 January 2006
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number of output pixel
number of input pixel
PAL/NTSC/SECAM video decoder
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
SAA7114
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