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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ADCS9888 датащи(PDF) 27 Page - National Semiconductor (TI) |
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ADCS9888 датащи(HTML) 27 Page - National Semiconductor (TI) |
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27 / 34 page  Application Information (Continued) 4.1.6 Pre-Coast and Post-Coast When Vsync is used as the coast source, the coast signal can be extended earlier and later by setting the Pre-Coast and Post-Coast settings in Registers 12h and 13h. This feature requires the chip to calculate the number of Hsync pulses (lines) per Vsync (frame). An 11 bit counter is pro- vided to support frame sizes up to 2048 lines (active lines plus vertical blanking overhead). Once the frame size has been calculated, the chip will an- ticipate when the next VSYNC begins, and the coast signal can be generated up to 255 lines earlier than the anticipated Vsync. Similarly, the Post-coast setting allows the PLL coast signal to be maintained as many as 255 lines following the de-assertion of Vsync. 4.1.7 Coast Polarity Detection The coast signal input to the Clock Generator can be an active high or active low signal. A polarity detection circuit determines the polarity of the Coast signal. The polarity is determined by observing the high/low duty cycle of the COAST signal to determine whether the signal is mostly high or mostly low. If the signal is mostly low, then the polarity is set as Positive. If the signal is mostly high, then the polarity is set to Negative. (0 = Negative, 1 = Positive) The results of this detection are sent to Register 14h, Bit 0. Clock Generation Setting Mode Resolution (Pixel/Lines) Refresh Rate Hz HSYNC Frequency kHz Pixel Rate MHz VCO RNGE VCO CPMP PLL DIV Setting VGA 640 x 480 60 31.5 25.175 00 010 799 72 37.7 31.500 00 011 831 75 37.5 31.500 00 011 839 85 43.3 36.000 00 011 831 SVGA 800 x 600 56 35.1 36.000 00 011 1023 60 37.9 40.000 00 011 1055 72 48.1 50.000 01 011 1039 75 46.9 49.500 01 011 1055 85 53.7 56.250 01 011 1047 XGA 1024 x 768 60 48.4 65.000 01 011 1343 70 56.5 75.000 01 100 1327 75 60.0 78.750 01 100 1311 80 64.0 85.500 10 011 1335 85 68.3 94.500 10 011 1375 SXGA 1280 x 1024 60 64.0 108.000 10 011 1687 75 80.0 135.000 10 101 1687 85 91.1 157.500 11 100 1727 UXGA 1600 x 1200 60 75.0 162.000 11 100 2159 65 81.3 175.500 11 100 2159 70 87.5 189.000 11 100 2159 75 93.8 202.500 11 101 2159 85 106.3 229.500 * 10 101 1079 Note: * Alternate pixel sampling mode. See section 4.2.1 www.national.com 27 |
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