Planar LC1200R - Manual (Page 14)

LC1200R User’s Guide 021-0183-00 Rev A 14 of 29
4.2.3 Mode Detection
The polarity of incoming horizontal/vertical frequencies and synchronization pulses define
the video resolution
being presented. Video modes are listed in Table 5 Video Mode
Definitions .
Table Table Table Table 5 5 5 5 Video Mode Definitions Video Mode Definitions Video Mode Definitions Video Mode Definitions
Video Mode Video Mode Video Mode Video Mode Displayed Displayed Displayed Displayed
Image
Image Image Image
Resolution
Resolution Resolution Resolution
Scanning Scanning Scanning Scanning
Frequency)
Frequency) Frequency) Frequency)
Sync Polarity Sync Polarity Sync Polarity Sync Polarity
Horizon
tal (KHz) Vertical
(Hz) Horizont
al Vertic
al
IBM VGA 640 x 400 31.468 70 - +
IBM VGA 640 x 480 31.468 60 - -
IBM VGA
w/Border 656 x 496 31.468 60 -
-
IBM VGA 720 x 400 31.468 70 - -
IBM VGA
w/Border 738 x 414 31.468 70
VESA 800 x 600 48.077 72 + +
VESA 1024 x 768 56.48 70 - -
4.2.4 Color Display Detection
The video signal source determines which type of display is connected to it based on the
state of the LC1200R sense lines. The LC1200R will indicate to the source that it is a "color
display" when the monitor sense line 1 (Pin 11) is physically connected to signal ground
reference (Pin 10) as defined by the wiring definitions ofTable 4 Video Signal Connector – Pin
Number Assignments
.
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 5.
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