NEC LCD1280 user manual Signal Timings

LCD1280 10/29/99 9:25 AM Page 10

Appendix 2

Signal Timings

Input Signal Timings (WS High Resolution Mode)

Item	Abbreviation		Monitor Rating
Pixel frequency		fc	107.5MHz ± 50ppm	9.302nsec/pixel	107.352HHz ± 50ppm	9.315nsec/pixel
Horizontal frequency		fh	64.60KHz		63.9KHz
Line Time total		Th	15.479usec	1664CLK	15.649esec	1680CLK
Horizontal active display		Thd	11.907usec	1280CLK	11.923usec	1280CLK
Horizontal sync pulse		Thp	1.786usec	192CLK	1.118usec	120CLK
Horizontal baack porch		Thb	1.488usec	160CLK	2.329usec	250CLK
Horizontal front porch		Thf	0.298usec	32CLK	0.279usec	30CLK
H-sync Rise & Fall		Thrf	5ns(max.)
Vertical frequency		fv	59.93Hz		60.0Hz
Frame time total		Tv	16.686msec	1078H	16.667msec	1065H
Vertical active display		Tvd	15.850msec	1024H	16.025msec	1029H
Vertical sync pulse		Tvp	0.062msec	4H	0.047msec	3H
Vertical back porch		Tvb	0.666msec	43H	0.548msec	35H
Vertical front porch		Tvf	0.108msec	7H	0.047msec	3H

IMPORTANT: The Jitter on Hsync output from video card should be less than 300 psec or you may see some jitter on the screen.

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Input Signal Timings (VGA Mode)

(The values of Front & Back porch are for reference only)

Item	Abbreviation		Monitor Rating
Pixel frequency		fc	25.175MHz ± 50ppm	39.72nsec/pixel
Horizontal frequency		fh	31.469KHz
Line Time total		Th	31.778usec	800CLK
Horizontal active display		Thd	25.422usec	640CLK
Horizontal sync pulse		Thp	3.813usec	96CLK
Horizontal back porch		Thb	1.907usec	48CLK
Horizontal front porch		Thf	0.636usec	16CLK
Vertical frequency		fv	59.94Hz
Frame time total		Tv	16.683msec	525H
Vertical active display		Tvd	15.253msec	480H
Vertical sync pulse		Tvp	0.063msec	2H
Vertical back porch		Tvb	1.017msec	32H
Vertical front porch		Tvf	0.350msec	15H

IMPORTANT: The Jitter on Hsync output from video card should be less than 300 psec or you may see some jitter on the screen.

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