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PYTHON480 데이터시트(PDF) 24 Page - ON Semiconductor |
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PYTHON480 데이터시트(HTML) 24 Page - ON Semiconductor |
24 / 69 page PYTHON 480 www.onsemi.com 24 Figure 20. reconfiguration Using Sync_configuration Frame NFrame N+1 Frame N+2 Frame N+3 Frame N+4 Time Line sync_configuration SPI Registers Active Registers This configuration is not taken into account as sync_register is inactive. NOTE: SPI updates are not taken into account while sync_configuration is inactive. The active configuration is frozen for the sensor. Table 17 lists the several sync_configuration possibilities along with the respective registers being frozen. Table 17. ALTERNATE SYNC CONFIGURATIONS Group Affected Registers Description sync_black_lines black_lines Update of black line configuration is not synchronized at start of frame when ‘0’. The sensor continues with its previous configurations. sync_dummy_lines dummy_lines Update of dummy line configuration is not synchronized at start of frame when ‘0’. The sensor continues with its previous configurations. sync_exposure mult_timer fr_length exposure Update of exposure configurations is not synchronized at start of frame when ‘0’. The sensor continues with its previous configurations. sync_gain mux_gainsw afe_gain db_gain Update of gain configurations is not synchronized at start of frame when ‘0’. The sensor continues with its previous configurations. sync_roi roi_active0[3:0] subsampling Update of active ROI configurations is not synchronized at start of frame when ‘0’. The sensor continues with its previous configurations. Note: The window configurations themselves are not frozen. reconfiguration of active windows is not gated by this setting. Window Configuration Up to 4 windows can be defined in global shutter mode (pipelined or triggered). The windows are defined by registers 256 to 265. Each window can be activated or deactivated separately using register 195. It is possible to reconfigure the inactive windows while the sensor is acquiring images. Switching between predefined windows is achieved by activation of the respective windows. This way a minimum number of registers need to be uploaded when it is necessary to switch between two or more sets of windows. As an example of this, scanning the scene at higher frame rates using multiple windows and switching to full frame capture when the object is tracked. Switching between the two modes only requires an upload of one register. Black Calibration The sensor automatically calibrates the black level for each frame. Therefore, the device generates a configurable number of electrical black lines at the start of each frame. The desired black level in the resulting output interface can be configured and is not necessarily targeted to ‘0’. Configuring the target to a higher level yields some information on the left side of the black level distribution, while the other end of the distribution tail is clipped to ‘0’ when setting the black level target to ‘0’. The black level is calibrated for the 2 columns contained in one kernel. This implies 2 black level offsets are generated and applied to the corresponding columns. Configurable parameters for the black−level algorithm are listed in Table 18. |
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