Chapter 9 343
Test Sequencing
Passing Data in the Sequencer
Passing Data in the Sequencer
In this lab, you will create a UserFunction and call it from three different
tests. In the first part, you will pass data to the
UserFunctions through an
input terminal on the
Sequencer. In the second part, you will modify the
program to use a global variable instead of an input terminal. This will give
you a chance to call a function in
EXEC mode rather than TEST mode. In the
third part, you will learn how to test a waveform output against a mask.
Lab 9-2: Passing Data Using an Input Terminal
First, follow the steps to create the UserFunction Rand, which will
simulate a measurement procedure.
Rand() will add an input parameter to
the output of the
random(low,high) object, and put this result on the
output pin.
Rand() will be called from three different tests.
1. Select
Device ⇒ UserFunction. Change the name from
UserFunction1 to Rand.
2. Get the
random(low,high) function, delete the input terminals, delete
the parameters, and place it in
Rand. (Recall that without parameters, the
defaults will be
0 and 1.) Place an A+B object to the right of
random(low,high). Connect the output of random(low,high) to the
upper left input of the
A+B object.
3. Add a data input terminal to
Rand. Connect the input terminal A to the
lower left input terminal of the
A+B object.
4. Add a data output terminal to
Rand. Connect the output of the A+B
object to the Rand output terminal.
The
UserFunction Rand should look like Figure 9-6.
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