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Vertical Sync Width Pulse.
In active mode (LCDTFT = 1), encoded value (from 1-64) used to specify the number of line clock periods to set the lcd_fp pin active at the end of each frame after the (vfp) period elapses. The number of clock cycles is programmed value plus one. The frame clock is used as the VSYNC signal in active mode.
In passive mode (LCDTFT = 0), encoded value (from 1-64) used to specify the number of extra line clock periods to insert after the vertical front porch (vfp) period has elapsed. Note that the width of lcd_fp is not affected by vsw in passive mode and line clock transitions during the insertion of the extra line clock periods (programmed value plus one).
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