DS90UB953A-Q1: PatGen total line per frame

Hello Ying,

For video timing, the total video blanking in the horizontal and vertical direction consists of Vertical Front Porch, Vertical Back Porch, and Vertical Sync Pulse. In the PATGEN registers, you are allowed to directly program all of the video timing parameters, except for the Sync Pulse. The Sync Pulse is indirectly set after all of the other video timing parameters have been set in the registers. See the calculations below for how the Vertical Sync Pulse was set in the default example given in the datasheet:

Vertical Total = reg 0x0A - reg 0x0B = 0x20D = 525

Vertical Active = reg 0x08 - reg 0x09 = 0x1E0 = 480

Vertical Front Porch = reg 0x0F = 0x0A = 10

Vertical Back Porch = reg 0x0E = 0x21 = 33

Vertical Sync Pulse = ?

Vertical Blanking = Vertical Front Porch + Vertical Back Porch + Vertical Sync Pulse

Vertical Total = Vertical Active + Vertical Blanking

Vertical Sync Pulse = Vertical Total - Vertical Active - Vertical Front Porch - Vertical Back Porch = 2

Best,

Justin Phan