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STV3550 Datasheet(PDF) 57 Page - STMicroelectronics |
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STV3550 Datasheet(HTML) 57 Page - STMicroelectronics |
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57 / 144 page  Output Stage STV3550 57/144 Note: RGB to YUV conversion and color filter functions are not used in LCD applications 5.1.4 GFX_ACTIVE Signal The chip delivers a GFX_ACTIVE signal that is high during the graphic insertion period and low during the video period. This signal can be used to control an external switch to insert the OSD when the video is generated externally (typically with a VGA source). Each edge of this signal can be adjusted in timing when compared with the Hout sync pulse. The delay is adjustable from -2 DAC_clock cycles to +5 DAC_clock cycles for the rising edge , and from -3 DAC_clock cycles to +4 DAC_clock cycles for the falling edge, as shown in the table below. Figure 41: Color Space Adaptor Block Diagram Table 15: Delay on Rising/Falling Edges of GFX_ACTIVE Signal DELAY_RISE Delay Value DELAY_FALL Delay Value 0000 CSA Stage Number - 7 clock cycles 0000 CSA Stage Number - 7 clock cycles 0001 CSA Stage Number - 6 clock cycles 0001 CSA Stage Number - 6 clock cycles 0010 CSA Stage Number - 5 clock cycles 0010 CSA Stage Number - 5 clock cycles 2 UPSAMPLING_EN FC 2 FC FC CLK_PIX FILTER_EN 30 10 RGB2YUV_EN CLK_DAC 10 10 2 10 10 10 10 10 10 Up-sampling COLOR_FILTER GFX_DELAY DELAY_RISE DELAY_FALL |
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