VESA Signal 640 x 400 @ 85 Hz timing

General timing

Screen refresh rate	85 Hz
Vertical refresh	37.860576923077 kHz
Pixel freq.	31.5 MHz

Horizontal timing (line)

Polarity of horizontal sync pulse is negative.

Scanline part	Pixels	Time [µs]
Visible area	640	20.31746031746
Front porch	32	1.015873015873
Sync pulse	64	2.031746031746
Back porch	96	3.047619047619
Whole line	832	26.412698412698

Vertical timing (frame)

Polarity of vertical sync pulse is positive.

Frame part	Lines	Time [ms]
Visible area	400	10.565079365079
Front porch	1	0.026412698412698
Sync pulse	3	0.079238095238095
Back porch	41	1.0829206349206
Whole frame	445	11.753650793651