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6-11
The upper right corner shows the Pixel Rate. The
pixel clock is the master clock used to generate all
of the format’s timing information. The pixel clock
period is also shown.
The remainder of the top half of the screen is taken
up by the horizontal and vertical parameters. These
parameters deal with the output signal timing and
physical size of the active video area. The names of
the parameters are shown at the far left of the screen.
The horizontal timing and size parameters are shown
in two columns. Most of the information in the left
hand column is in machine units and most of infor-
mation in the right hand column is in real time units.
The only exception is the physical size. You can
always enter the size in either inches or millime-
ters. The vertical parameters are set up in a similar
manner.
❖ See a later section in this chapter called “Creat-
ing your own format file” for more descriptive
information on format parameters and how they
relate to each other.
The first line for both sets of parameters is the “Rate.”
The horizontal rate is the number of times per sec-
ond your display scans in the horizontal direction.
The vertical rate is number of times per second your
display scans from the top to the bottom of the screen.
This rate is equal to the frame rate for non-inter-
laced formats and twice the frame or picture refresh
rate for interlaced formats.
Entering a new value for the pixel rate, horizontal
rate or the vertical rate will cause the other two
rates to change. This is because the newly entered
rate becomes the reference used to calculate the other
two. The ratio of the pixel rate to the horizontal rate
will always be equal to the total number of pixels in
one horizontal period. The ratio of the horizontal
rate to the vertical rate will always be equal to the
number of lines in one vertical period for non-inter-
laced formats. The ratio will always be equal to one