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4.2.2
MOST POSITIVE UP LEVEL
LEAST POSITIVE UP LEVEL
Title: Engineering Specification: 12.1-inch AMLCD Monitor
Document Number: 023-0284-00
Synchronization
Sync pulses for horizontal and vertical are TTL levels. Figure 8 defines the levels and
drive current capabilities.
MPDL
MOST POSITIVE DOWN LEVEL
LPDL
LEAST POSITIVE DOWN LEVEL
MPUL
5.5& volt
2.5& volt @ I = 0.4ma
LPUL
Source Current
0.4& volt @ I = 4.0ma
MPDL
Sink Current
LPDL
0.0& volt
CONTROL
LOGIC
Figure 6. TTL Allowable Signal Levels
4.2.2.1 Mode Detection
The polarity of incoming horizontal/vertical frequencies and synchronization pulses define
the video resolution being presented. Video modes are listed in Table 3.
Video Mode
IBM VGA
IBM VGA
IBM VGA w/Border
IBM VGA
IBM VGA w/Border
MPUL
LPUL
+ I
DISPLAY
Displayed
Scanning Frequency)
Image
Resolution
Horizontal
(KHz)
640 x 400
31.468
640 x 480
31.468
656 x 496
31.468
720 x 400
31.468
738 x 414
31.468
Sync Polarity
Vertical
Horizontal
(Hz)
70
-
60
-
60
-
70
-
70
Page 12 of 27
Revision: A
Vertical
+
-
-
-
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