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VG6640 数据表(PDF) 76 Page - STMicroelectronics |
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VG6640 数据表(HTML) 76 Page - STMicroelectronics |
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76 / 126 page  Video timing VG6640, VD6640 76/126 DocID023597 Rev 11 6.4 Variable line length and frame length The frame rate of the array readout and therefore the output is governed by the line length, the frame length and the video timing pixel clock frequency. The frame rate in frames per second (fps) may be calculated as: where: • line_length_pck is the line length, register Line_Length_PCK (0x0342) • frame_length_lines is the frame length, register FrameLengthLines(0x212d) The output frame rate of image sensor may be reduced by extending either the line length or the frame length. The extension is achieved by adding extra blank pixels at the end of a line or blank lines to act as timing padding. Reducing the frame rate by extending the frame length (and not the line length) has the advantage that it does not reduce the pixel readout rate or the active frame time. Therefore it minimises potential unwanted motion artefacts in the image. Frame timing examples are shown in Table 34. Framerate VT_PixelClock_MHz line_length_pck frame_length_lines × --------------------------------------------------------------------------------------------------- = Table 34. External clock frequency examples, full FOV, 45 fps Ext Clk Freq Pre-PLL Clk Div PLL multiplier VT Sys Clk Div VT pixel Clk Div VT pixel clock OP Sys Clk Div OPpixel Clk Div OP pixel clock Line length Frame length MHz Integer Integer (Dec) Integer Integer MHz Integer Integer MHz Pixel Clks Lines (Dec) 12 2 132 1 6 66 1 8 49.50 1438 1023 24 4 132 1 6 66 1 8 49.50 1438 1023 27 4 117 1 6 65.81 1 8 49.36 1438 1023 45 4 70 1 6 65.63 1 8 49.22 1438 1023 50 8 126 1 6 65.63 1 8 49.22 1438 1023 |
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