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PYTHON480 データシート(PDF) 44 Page - ON Semiconductor |
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PYTHON480 データシート(HTML) 44 Page - ON Semiconductor |
44 / 69 page PYTHON 480 www.onsemi.com 44 The frame format is explained with an example of the readout of two (overlapping) windows as shown in Figure 39 (a). The readout of a frame occurs on a line−by−line basis. The read pointer goes from left to right, bottom to top. Figure 39 (a) and (b) indicate that, after the FOT is finished, a number of lines which include information of ‘ROI 0’ are sent out, starting at position y0_start. When the line at position y1_start is reached, a number of lines containing data of ‘ROI 0’ and ‘ROI 1’ are sent out, until the line position of y0_end is reached. Then, only data of ‘ROI 1’ appears on the data output until line position y1_end is reached. The line_valid strobe is not shown in Figure 39. Figure 39. CMOS Mode: Frame Format to Read Out Image Data (a) (b) 1280 pixels y0_start y1_start y0_end y1_end x0_start x1_start x0_end x1_end ROI0 ROI1 Reset N Exposure Time N Reset N+1 Exposure Time N +1 ROI0 FOT FOT Integration Time Handling Readout Handling FOT Readout Frame N -1 Readout Frame N ROI0 ROI1 Frame valid FOT FOT ROI1 Black Lines Black pixel data is also sent through the data channels. To distinguish these pixels from the regular image data, it is possible to ‘mute’ the frame and/or line valid indications for the black lines. Refer to Table 32 for black line, frame_valid and line_valid settings. Table 32. BLACK LINE FRAME_VALID AND LINE_VALID SETTINGS bl_frame _valid_enable bl_line _valid_enable Description 0x1 0x1 The black lines are handled similar to normal image lines. The frame valid indication is asserted before the first black line and the line valid indication is asserted for every valid (black) pixel. 0x1 0x0 The frame valid indication is asserted before the first black line, but the line valid indication is not asserted for the black lines. The line valid indication indicates the valid image pixels only. This mode is useful when one does not use the black pixels and when the frame valid indication needs to be asserted some time before the first image lines (for example, to precondition ISP pipelines). 0x0 0x1 In this mode, the black pixel data is clearly unambiguously indicated by the line valid indication, while the decoding of the real image data is simplified. 0x0 0x0 Black lines are not indicated and frame and line valid strobes remain de−asserted. Note however that the data channels contains the black pixel data and CRC codes (Training patterns are interrupted). |
同様の部品番号 - PYTHON480 |
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同様の説明 - PYTHON480 |
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