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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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FS401LF 数据表(PDF) 83 Page - List of Unclassifed Manufacturers |
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FS401LF 数据表(HTML) 83 Page - List of Unclassifed Manufacturers |
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83 / 104 page  FS401, FS403 PRODUCT SPECIFICATION REV. NO. 1.7 83 JANUARY 24, 2007 COPYRIGHT © 1999 FOCUS ENHANCEMENTS, INC. 5.2.6 Zoom When zoom is activated by setting the ZOOM bit to 1 in the Command Register, pixels are 2X replicated in the vertical and the horizontal directions. Pixels are replicated vertically by the Capture Engine that duplicates the loading of each line into the Frame Store. If, for example, only 120 separate lines are accepted, then 240 lines are written to each field contained the Frame Store Memory. When the zoomed frame segment is retrieved, the number of horizontal pixels is doubled by duplicating each pixel twice as the pixels are read from the Frame Store Memory. IHAW should be set to ½ the non-zoomed IHAW. Offset may be applied to a zoomed image through the IHO and IVO registers as shown in Figure 14 Figure 14. Zoomed image showing offsets 5.3 Encoder Engine 5.3.1 Timing and Control Timing of the Encoder Engine is synchronized by the Encoder Timing and Control Block. Frame store clock, RAMCK_OUT is derived from the OSC1 clock by the SDRAM phase locked loop. A clock signal must always be applied to the default clock input, OSC1. Depending upon the outgoing TV standard requirements, one of many possible clock combinations can be selected as depicted in the table below. Output Standard OSC1 OSC2 NTSC and PAL 14.31818 MHz 17.734475 MHz NTSC only 14.31818 MHz VSSPF PAL only Connect to OSC2 17.734475 MHz Super RGB NTSC only 14.31818 MHz 20.140 MHz Super RGB PAL only 17.734475 MHz 20.000 MHz NTSC and VGA or VGA only 14.31818 MHz 25.175 MHz NTSC and SVGA or SVGA only 14.31818 MHz 38.400 MHz NTSC and Progressive NTSC 14.31818 MHz 28.63636 MHz Progressive NTSC only 14.31818 MHz 28.63636 MHz 100Hz PAL only 17.734475 MHz 35.46895 MHz Table 4. Clock Connections If other combinations are desired (such as PAL and 100Hz), then OSC2 must be multiplexed with the different frequencies desired while OSC1 is connected to a 14.31818 MHz or 17.734475 MHz input. General principles apply as follows: • NTSC, VGA, SVGA, and Progressive NTSC assume a 14.31818 MHz clock on OSC1 • PAL must be on OSC2 • 100Hz PAL interlaced assumes 17.734475 on OSC1 and 35.46895 on OSC2 |
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