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MT9D011 Datasheet(PDF) 43 Page - Micron Technology |
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MT9D011 Datasheet(HTML) 43 Page - Micron Technology |
43 / 61 page MT9D011 2-MEGAPIXEL DIGITAL IMAGE SENSOR PRELIMINARY 09005aef81516da4 Micron Technology, Inc., reserves the right to change products or specifications without notice. MT9D011__MI2010_E_2.fm - Rev. A 11/04 EN 43 ©2004 Micron Technology, Inc. All rights reserved. Frame Rate Control For a given window size, the blanking registers (Reg0x05-Reg0x08) along with the row speed register (Reg0x0A) can be used to set a particular frame rate. The frame timing equations (Table 3 and Table 4 on page 12) can be rearranged to express the horizontal blanking or vertical blanking values as a function of the frame rate: The HBLANK_REG value allows the frame rate to be adjusted with a minimum resolution of one PIXCLK_PERIOD multiplied by the total number of rows (displayed plus blanking). When finer resolution is required, Reg0x0b (Extra Delay) can be used. Reg0x0b allows the frame time to be changed in incre- ments of pixel clocks. Minimum Horizontal Blanking The minimum horizontal blanking value is con- strained by the time used for sampling a row of pixels and the overhead in the row readout. This is expressed in Table 10. Minimum Row Time Requirement The total row time must be sufficient to allow all row operations (readout and shutter operations). The row time is the sum of column width (halved during bin- ning divided by column skip factor) and horizontal blanking, and can therefore be adjusted by program- ming these. Table 11 shows minimum row time as a function of mode of operation. Note that this is a particularly strict requirement during binning because twice as many row operations are required per row and the column width is halved. HBLANK_REG = master clock freq / (frame rate* ((Reg0x03/S + BORDER) + VBLANK_REG)*PIXCLK_PERIOD) - (Reg0x04/S + BORDER) VBLANK_REG = master clock freq / (frame rate* ((Reg0x04/S + BORDER) + HBLANK_REG)*PIXCLK_PERIOD) - (Reg0x03/S + BORDER) Table 10: Minimum Horizontal Blanking Parameters PARAMETER DEFAULT / 2 ADC MODE, NO BINNING 1 ADC MODE, NO BINNING 2 ADC MODE, BINNING 1 ADC MODE, BINNING HBLANK(MIN) 286 mclks 324 mclks = 162 pixclks 470 mclks 508 mclks = 254 pixclks Table 11: Minimum Row Time Parameters PARAMETER DEFAULT / 2 ADC MODE, NO BINNING 1 ADC MODE, NO BINNING 2 ADC MODE, BINNING 1 ADC MODE, BINNING ROW_TIME(MIN) 473 mclks 488 mclks = 244 pixclks 931 mclks 946 mclks = 473 pixclks pointer_operations 461 mclks 464 mclks 919 mclks 922 mclks |
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