Samsung 203B service manual Timing Chart, Mode

14 Reference Infomation

14-3 Timing Chart

-This section of the service manual describes the timing that the computer industry recognizes as standard for computer-generated video signals.

Table 14-1 Timing Chart

Mode	IBM					VESA
	VGA2/	VGA3/	640/75 Hz	800/60 Hz	800/75 Hz	1024/60 Hz	1024/75 Hz	1280/60 Hz	1280/75 Hz
	70 Hz	60 Hz
			640x480	800x600	800x600	1024x768	1024x768	1280x1024	1280x1024
Timing	720 x 400	640 x 480
fH (kHz)	31.469	31.469	37.500	37.879	46.875	48.363	60.023	63.981	79.975
A μsec	31.777	31.778	26.667	26.400	21.333	20.677	16.660	11.852	12.504
B μsec	3.813	3.813	2.032	3.200	1.616	2.092	1.219	1.037	1.067
C μsec	1.589	1.589	3.810	2.200	3.232	2.462	2.235	2.296	1.837
D μsec	26.058	26.058	20.317	20.000	16.162	15.754	13.003	9.259	9.481
E μsec	0.318	0.318	0.508	0.000	0.323	0.369	0.203	0.000	0.119
fV (Hz)	70.087	59.940	75.000	60.317	75.000	60.004	75.029	60.020	75.025
O msec	14.268	16.683	13.333	16.579	13.333	16.666	13.328	16.005	13.329
P msec	0.064	0.064	0.080	0.106	0.064	0.124	0.050	0.047	0.038
Q msec	0.858	0.794	0.427	0.607	0.448	0.600	0.466	0.594	0.475
R msec	13.155	15.761	12.800	15.840	12.800	15.880	12.795	15.630	12.804
S msec	0.191	0.064	0.027	0.0261	0.021	0.062	0.017	0.016	0.013
Clock
Freq.	28.322	26.175	31.500	40.000	49.500	75.000	78.750	108.000	135.000
(MHz)
Polarity
H.Sync	Negative	Negative	Negative	Positive	Positive	Negative	Positive	Positive	Positive
V.Sync	Positive	Negative	Negative	Positive	Positive	Negative	Positive	Positive	Positive
Remark	Separate	Separate	Separate	Separate	Separate	Separate	Separate	Separate	Separate

		Separate Sync
Video			Video
C	D	E	Q	R	S
Sync			Sync
	B			P
	A			O

H/V Composite Sync

Sync-on-Green

A : Line time total	B : Horizontal sync width	O : Frame time total	P : Vertical sync width
C : Back porch	D : Active time	Q : Back porch	R : Active time
E : Front porch		S : Front porch

14-5