Tadpole SPARCbook 3000 series, User Manual

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SPARCbook Portable Workstation User Guide 11-15
Using Displays
Adding to the Display Types List
Note
For a brief explanation of display interface hardware parameters, see “Display
Timing Parameters” on page 11-16.
Table 11-2 shows an example set of video timing parameters as
presented in a manufacturer’s specification for an actual monitor.
Using the manufacturer’s parameters, the horizontal and vertical back
porches can be calculated in the following way:
Horizontal Back Porch = HBlanking – HSync delay – HSync width
= 144 pixels
Vertical Back Porch = VBlanking – VSync delay – VSync width
= 39 lines
The most convenient way to create a new display definition is to edit an
existing one by changing the name and modifing any of the
characteristics as necessary. For example, you may need only to change
the sync signals from being separate horizontal and vertical signals to
being combined onto the green video channel.
Display Manufacturer’s
NCE Equivalent Field Unit
Parameter Specification
Pixel Rate 100000 Pixel Clock Frequency KHz
Horizontal frequency 68.68 - KHz
Vertical frequency 75 - Hz
Horizontal resolution 1152 Horizontal Resolution Pixels
Vertical resolution 900 Vertical Resolution Lines
HPeriod 1456 - Pixels
HBlanking 304 See below Pixels
HSync delay 32 Horizontal Front Porch Pixels
HSync width 128 Horizontal Sync Width Pixels
VPeriod 915 - Lines
VBlanking 45 See below Lines
VSync delay 3 Vertical Front Porch Lines
VSync width 3 Vertical Sync Width Lines
Table 11-2 Example Display Parameters
S3UG4_Book Page 15 Friday, August 8, 1997 11:37 am