VGA Signal 640 x 400 @ 70 Hz timing

General timing

Screen refresh rate	70 Hz
Vertical refresh	31.46875 kHz
Pixel freq.	25.175 MHz

Horizontal timing (line)

Polarity of horizontal sync pulse is negative.

Scanline part	Pixels	Time [µs]
Visible area	640	25.422045680238
Front porch	16	0.63555114200596
Sync pulse	96	3.8133068520357
Back porch	48	1.9066534260179
Whole line	800	31.777557100298

Vertical timing (frame)

Polarity of vertical sync pulse is positive.

Frame part	Lines	Time [ms]
Visible area	400	12.711022840119
Front porch	12	0.38133068520357
Sync pulse	2	0.063555114200596
Back porch	35	1.1122144985104
Whole frame	449	14.268123138034