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Digital Sync Parameters
Some analog video and all digital video displays
require one or two digital sync signals. The paramters
associated with these signals can be found at the
top of the right-hand column of the format work-
sheet.
If your display accepts separate horizontal and ver-
tical digital sync signals, you should set the DSST
parameter to the exact type that is needed. A set-
ting of zero (0) means that separate horizontal and
vertical digital sync cannot be selected.
The polarity of the separate horizontal sync output
is controlled by the HSPP parameter, while the po-
larity of the separate vertical sync output is con-
trolled by the VSPP parameter.
❖ Entering the wrong HSPP polarity may cause all
of the test images to be shifted horizontally on
a properly adjusted display. Entering the wrong
VSPP polarity may cause all of the test images
to be shifted vertically on a properly adjusted
display.
Also, many multi-scan mode displays depend on
the polarity of the sync pulses to determine their
exact operating mode. The wrong polarities may
prevent the display from locking to the format’s
scan rates or may cause the size of the active
video to be way off.
If your display accepts a single combined digital
sync input, you should set the DSCT parameter to
the exact type that is needed. A setting of zero (0)
means that digital composite sync cannot be selected.
The polarity of the digital composite sync output is
controlled by the CSPP parameter.
You have now defined the type of video and sync
that will be generated when your new format is
selected. Next, you will specify the timing of the
various signal components.