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Example 8: Creating a Sequence With Many States #1 Teledyne LeCroy
4.11 Example 8: Creating a Sequence With Many States #1
In this example, a five ‐ state sequence detects if a group of primitives is received
out ‐ of ‐ order from the initiator. The expected order is: Align (0), Align (1), Align (2), Align
(3). If this scenario detects any other order of these primitives, it causes the device to
beep and the scenario to restart.
This example is designed to give you an idea of the powerful logic that you can implement
with sequences.
Note that the states in this sequence have been renamed (do not have their default
names). The following table summarizes the sequence logic.
TABLE 4.11: Example 8: Logic of Sequence 0
1. Click the New Scenario button in the main library or one of the device libraries. In
the Scenario Properties dialog, enter the scenario name, description, and direction
of traffic change.
2. As in previous examples, create the five states for this sequence.
State Description
Wait for Align (0) When an Align (0) is received, go to Wait for Align (1).
Wait for Align (1) If an Align (1) is received next, go to Wait for Align (2);
otherwise, go to Indicate Error.
Wait for Align (2) If an Align (2) is received next, go to Wait for Align (3);
otherwise, go to Indicate Error.
Wait for Align (3) If an Align (3) is received next, restart test;
otherwise go to Indicate Error.
Indicate Error Indicate error and restart test.