Title:
Engineering Specification: 12.1-inch AMLCD Monitor
Page
13 of 27
Document Number
: 023-0284-00
Revision:
A
VESA
800 x 600
48.077
72
+
+
VESA
1024 x 768
56.48
70
-
-
Table 3. Video Mode Definitions
4.2.2.2 Color Display Detection
The video signal source determines which type of display is connected to it based
on the state of the Monitor Sense Lines. The Monitor will indicate to the source
that it is a "color display" when Monitor Sense Line 1 (Pin 11) is physically
connected to Signal Ground Reference (Pin 10) as defined by the wiring
definitions of Table 2.
4.3 Signal Quality
4.3.1 TTL Sync Pulse Signal Levels
Input levels for the horizontal and vertical sync pulses are defined in Figure 8.
4.3.2 Rise and Fall Times
Rise and fall times are the times required for signal transitions between 10% of Vs above
Low Steady Level and 10% of Vs below High Steady Level where Vs is the peak-to-peak
video input signal level. The overshoot, if present, shall be exempted from establishing
these high/low levels referenced in. Both rise and fall times of each input signal shall be as
follows:
Video:
Less than 5-ns
Horizontal Sync:
Less than 50-ns
Vertical Sync:
Less than 100-ns
4.4 Timing and Frequency
4.4.1 Video, Horizontal And Vertical Sync
Figure 6 illustrate video timing relationships the Monitor operates within when the
specified video mode (per Table 3) is applied.
Front Porch
defines the time from end of active video data to the start of Horiz/Vert Sync
Pulse.
Back Porch
defines the time from end of Horiz/Vert Sync Pulse to the start of active video
data.
Blanking
is the total time comprising Front Porch, Back Porch and Sync Pulse time(s).
The horizontal sync circuitry synchronizes to horizontal frequencies of 31.468 KHz ±0.5
KHz, 48.077KHz ±0.5KHz, and 56.476KHz ±0.5KHz. Horizontal sync pulse width
variation is 1.813-µsec to 3.813-µsec. The Monitor will "sync" to the specified format
vertical frequencies between 60Hz
&
72Hz without adjustment.
Absence of Horizontal and/or Vertical Sync will not damage the Monitor nor violate EMI
radiation limits specified herein.
