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As an example,
shown:
suppose
YOU
the present for
field as
present
for
1)]
[
50ns
1
Figure
18-12.
Example of Pattern Duration (Greater Than)
'
This configuration tells the timing analyzer to look for the pattern you
specified that occurs for a period of time greater than 50 ns. Once the
timing analyzer has found the pattern, it can look for the trigger.
Choosing < (less than) forces glitch and edge triggering off, and the
timing analyzer triggers immediately at the end of the pattern that
meets the duration requirements. The fields with which you specify
edges and glitches do not appear in the menu. For instance, configure
the present for
field as shown below.
present
for
1(1
[
100
ns
Figure
1843.
Example of Pattern Duration (Less Than)
The analyzer triggers when it sees the pattern you specified, and that
occurs for a period less than
100
ns. The pattern must also be valid for
at least 20 ns.
Then Find Edge
With the Then find Edge fields you can specify the edges (transitions)
of the data on which your timing analyzer triggers. You can specify a
positive edge, a negative edge, or either edge. Each label has its own
edge trigger specification field so that you can specify an edge on any
channel.
When you specify an edge on more than one channel, the timing
analyzer logically ORs them together to look for the trigger point. That
is, it triggers when it sees any one of the edges you specified. It also
ANDs the edges with the pattern you specified in the Find Pattern
fields. The logic analyzer triggers on an edge following the valid
duration of the pattern while the pattern is still present. To specify an
edge, place the cursor on one of the Then find Edge fields and press
SELECT. You will see a pop-up similar to that shown in the following
figure.
HP 16526/16538
Front-Panel Reference
Timing Trace Specification Menu
1841
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