PAS6311LT Datasheet, PDF (7/18 Pages) Pixart Imaging Inc. – CMOS VGA DIGITAL IMAGE SESNSOR

PAS6311LT Specification
3.8. Sub-Sampling
PAS6311LT can be programmed to output image in QVGA and QQVGA size. For QVGA sub-sampling
mode, both vertical and horizontal pixels are divided by 2; For QQVGA sub-sampling mode, both vertical
and horizontal pixels are divided by 4. By programming Skip_Analog and Skip_Digital, the maximum
sub-sampling rate is 1/64 ( Skip_Analog + Skip_Digital ).
3.8.1. Skip_Analog
Analog sub-sampling to (1/2) * VGA size readout :
H_Start[9:0] = 0,
V_Start[8:0] = 0,
H_Size[9:0] = 647,
Nov_Size[7:0] = 136, Skip_Analog = 1 ( sub-sampling 1/2 )
V_Size[8:0]= 487,
Figure 3.6
Valid pixels = ( H_Size + 1 ) / Skip_Analog = ( 647 + 1 ) / 2 = 324
Valid lines = ( V_Siez + 1 ) / Skip_Analog = ( 487 + 1 ) / 2 = 244
Figure 3.7 Inter-line timing of Skip_Analog = 1
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v1.5 2007/10/02