Hallo Michael, in automatic mode both are calculated automatically, VIRT_WIDTH is kept to the minimal value allowed by the sensor specs (the shorter the line time the less distortion form the electronic rolling shutter) and VIRT_HEIGHT is adjusted to limit the frame rate while obeying sensor specs (9<=vertical_blank<=2047) - the vertical blank is calculated as a difference VIRT_HEIGHT-WOI_HEIGHT-4 (4 comes from exrta pixels used for color interpolation). You may watch the vertical blank value as SENSOR_REGS6 parameter in parsedit.php, just don't change it (or do that with care) as the software will get "confused". You will also need to set VIRT_KEEP=1 to disable automatic VIRT_HEIGHT adjustment.
What is the line pairs/sec rate are you looking for in your application. If it is slow enough you will be able to run sensor in triggered mode - mode when the frame rate is precisely controlled by the fpga generator, where the period is specified in pixel clock cycles (96MHz). But the maximal frame rate is lower in that mode - each frame includes additionally 8 lines time +exposure time Andrey
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