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Chapter 6: Programming
Model 801GC, 801GF & 801GX¥Rev. A
• A spec sheet may give you the vertical front
porch in milli-seconds. The value for VSPD can
be calculated with this formula:
VSPD = HRAT x Front Porch
Where Front Porch is in units of seconds and
HRAT is in units of Hz. Remember to round
the result to the nearest integer.
The VSPW parameter sets the width of the vertical
sync pulse in units of scan lines. Many spec sheets
refer to this parameter as “Vertical Sync Pulse Width.”
If your spec sheet gives you the pulse width in units
of lines, use this value for VSPW. Here is another
way to calculate the value for HSPW from other data
on your spec sheet:
• A spec sheet may give you the horizontal sync
pulse width in micro-seconds. The value for
HSPW can be calculated with this formula:
VSPW = HRAT x Pulse Width
Where Pulse Width is in units of seconds and
HRAT is in units of Hz. Remember to round
the result to the nearest integer.
❖
The vertical sync pulse width is the overall width
of the vertical sync interval if you are working
with serrated composite sync. Do not use the
distance between the individual serration pulses
for VSPW.
Some displays that use either a digital or analog
composite sync signal need to have extra pulses added
to the sync. Serration and equalization pulses help
stabilize the display’s horizontal sweep circuitry
during the vertical sync interval. The previously
discussed DSCT and ASCT parameters determine if
serrations and equalization pulses are added to ei-
ther of the composite sync outputs. The number of
equalization pulses, if used, can also be programmed.
Summary of Contents for 801GC, 801GF, 801GX
Page 1: ...Owner s and Programmer s Manual Model 801GC 801GF 801GX Portable Video Signal Generators ...
Page 16: ...xiv Table of Contents Models 801GC 801GF 801GX Rev A Notes ...
Page 17: ...1 1 Features Product Overview Chapter 1 Introduction ...
Page 21: ...2 1 Operating Modes Displays Indicators Knobs Switches Buttons Chapter 2 Basic Operation ...
Page 31: ...3 1 Introduction Format charts Chapter 3 Built In Formats ...
Page 39: ...4 1 Description of the test images and how to use them Chapter 4 Built In Images ...
Page 126: ...5 14 Chapter 5 Making Connections Model 801GC 801GF 801GX Rev A Notes ...
Page 304: ...6 178 Chapter 6 Programming Model 801GC 801GF 801GX Rev A Notes ...
Page 305: ...7 1 Power on Computer Interfacing If all else fails Chapter 7 Troubleshooting ...
Page 346: ...A 6 Appendix A Specifications Model 801GC 801GF 801GX Rev A Notes ...
Page 355: ...Notes ...