Specifications

CHAPTER 3
I/O Features
Video Timing Parameters 37
Table 3-13 lists the timing parameters for the smaller monitors listed: the 12-inch color
monitor, the 14-inch color monitor, and a standard VGA monitor.
Table 3-12 Video timing parameters for smaller monitors
Monitor type and dimensions
Parameter
12-inch color
(512 by 384)
14-inch color
(640 by 480)
VGA
(640 by 480)
Dot clock 15.67 MHz 30.24 MHz 25.18 MHz
Dot time 63.83 ns 33.07 ns 39.72 ns
Line rate 24.48 kHz 35.00 kHz 31.47 kHz
Line time 40.85 µs
(640 dots)
28.57 µs
(864 dots)
31.78 µs
(800 dots)
Horizontal active video 512 dots 640 dots 640 dots
Horizontal blanking 128 dots 224 dots 160 dots
Horizontal front porch 16 dots 64 dots 16 dots
Horizontal sync pulse 32 dots 64 dots 96 dots
Horizontal back porch 80 dots 96 dots 48 dots
Frame rate 60.15 Hz 66.67 Hz 59.94 Hz
Frame time 16.63 ms
(407 lines)
15.01 ms
(525 lines)
16.68 ms
(525 lines)
Vertical active video 384 lines 480 lines 480 lines
Vertical blanking 23 lines 45 lines 45 lines
Vertical front porch 1 line 3 lines 10 lines
Vertical sync pulse 3 lines 3 lines 2 lines
Vertical back porch 19 lines 39 lines 33 lines