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Present/Absent field
< > field
Duration Assignment Menu
Present/Absent Field This field determines whether the resource
becomes true when the bit pattern is present or absent for the specified
time interval.
< > Field This field allows you to choose whether the pattern duration
is longer or shorter than the specified time. When (<) is selected, the
resource is true for one clock cycle after a pattern is present/absent for
less than the duration value. When you select (<), the until exit/upon
entry/upon exit field disappears.
When (>) is selected, additional control over pattern duration becomes
available. This control allows you to pick what happens after the pattern has
been present/absent for more than the duration value.
Until exit/ Upon entry/ Upon exit Field This part of the Set Pattern
Duration statement dictates how long the resource is true after the
pattern duration is met. The Until Exit selection keeps the resource true
from the time the duration is met, until the end of the pattern. The Upon
Entry selection makes the resource true for only one clock cycle after the
duration is met. The Upon Exit selection makes the statement true for
one clock cycle after the end of the pattern.
The Trigger Menu
Creating a User Level
Until exit/Upon entry/
Upon exit field
4–21
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