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PYTHON480 Datasheet(PDF) 23 Page - ON Semiconductor |
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PYTHON480 Datasheet(HTML) 23 Page - ON Semiconductor |
23 / 69 page PYTHON 480 www.onsemi.com 23 Dynamic Readout Parameters It is possible to reconfigure the sensor while it is acquiring images. Frame related parameters are internally resynchronized to frame boundaries, such that the modified parameter does not affect a frame that has already started. However, there can be restrictions to some registers as shown in Table 16. Some reconfiguration may lead to one frame being blanked. This happens when the modification requires more than one frame to settle. The image is blanked out and training patterns are transmitted on the data and sync channels. Table 16. DYNAMIC READOUT PARAMETERS Group Addresses Description Subsampling 192[7] Subsampling is synchronized to a new frame start. ROI configuration 195 256–265 A ROI switch is only detected when a new window is selected as the active window (reconfiguration of register 195). reconfiguration of the ROI dimension of the active win- dow does not lead to a frame blank and can cause a corrupted image. Exposure reconfiguration 199−203 Exposure reconfiguration does not cause artifact. However, a latency of one frame is ob- served unless reg_seq_exposure_sync_mode is set to ‘1’ in triggered global mode (mas- ter). Gain reconfiguration 204−205 Gains are synchronized at the start of a new frame. Optionally, one frame latency can be incorporated to align the gain updates to the exposure updates (refer to register 204[13] − gain_lat_comp). Freezing Active Configurations Though the readout parameters are synchronized to frame boundaries, an update of multiple registers can still lead to a transient effect in the subsequent images, as some configurations require multiple register uploads. For example, to reconfigure the exposure time in master global mode, both the fr_length and exposure registers need to be updated. Internally, the sensor synchronizes these configurations to frame boundaries, but it is still possible that the reconfiguration of multiple registers spans over two or even more frames. To avoid inconsistent combinations, the active configurations can be frozen while altering the SPI registers by disabling synchronization for the corresponding functionality before reconfiguration. When all registers are uploaded, re−enable the synchronization. The sensor’s sequencer then updates its active set of registers and uses them for the coming frames. Freezing of the active set of registers can be programmed in the sync_configuration registers, which can be found at the SPI address 206. Figure 19 shows a reconfiguration that does not use the sync_configuration option. As depicted, new SPI configurations are synchronized to frame boundaries. Figure 20 shows the usage of the sync_configuration settings. Before uploading a set of registers, the corresponding sync_configuration is de−asserted. After the upload is completed, the sync_configuration is asserted again and the sensor resynchronizes its set of registers to the coming frame boundaries. As seen in the figure, this ensures that the uploads performed at the end of frame N+2 and the start of frame N+3 become active in the same frame (frame N+4). Figure 19. Frame Synchronization of Configurations (no freezing) Frame NFrame N+1 Frame N+2 Frame N+3 Frame N+4 Time Line SPI Registers Active Registers |
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