User`s guide

20” Slow Scan User Guide 150-082
-7- -5-
MAC 49.7K VESA 56.5K 64K
Mode 5 6 7
Hor.Freq. (KHz) 49.722 56.476 64.02
Vert. Freq. (Hz) 74.543 70.069 60.00
Dot Clock (MHz) 57.28 75.00 110.00
Hor.Total Time (us) 20.112 17.707 15.625
Hor. Active Time (us) 14.525 13.653 11.625
Front Porch (us) 0.559 0.32 0.300
SYNC Pulse Width (us) 1.117 1.813 1.600
Back Porch (us) 3.911 1.920 2.100
Border (us) 0 0 0
Vert. Total Time (ms) 13.415 14.272 16.670
Vert. Active Time (ms) 12.550 13.599 16.000
Front Porch (ms) 0.02 0.053 0.031
SYNC Pulse Width (ms) 0.06 0.106 0.047
Back Porch (ms) 0.784 0.513 0.594
Border (ms) 0 0 0
SYNC Polarity (H,V) -,- -,- +,+
Timings
Timings
VGA1 640 X 350 VGA2 720 X 400 VGA3 640 X 480 MAC35k
Mode 1 2 3 4
Hor. Freq (kHz) 31.468 31.468 31.468 34.975
Vert. Freq. (Hz) 70.09 70.09 59.94 66.62
Dot Clock (MHz) 25.175 28.322 25.175 31.3344
Hor. Total Time 31.778 31.778 31.778 28.59
Hor. Active Time (us) 26.058 26.058 26.058 20.421
Front Porch (us) 0.318 0.318 0.318 2.553
SYNC Pulse Width (us) 3.81 3.81 3.81 2.042
Back Porch (us) 1.589 1.589 1.589 3.574
Border (us) 0.32 0.32 0.32 0
Vert.Total Time (ms) 14.268 14.268 16.683 15.01
Vert. Active Time (ms) 11.504 13.156 15.762 13.723
Front Porch (ms) 0.985 0.159 0.064 0.086
SYNC Pulse Width (ms) 0.06356 0.06356 0.06356 0.086
Back Porch (ms) 1.716 0.889 0.794 1.115
Border (ms) 0.191 0.222 0.254 0
SYNC Polarity (H,V) +,- -,+ -,- -,-