User guide

In this example, the number of blocks has been set to three. A "None" block
generates no pattern and is completely ignored (indicated by a straight vertical
blue line).
Sequence Trigger at Block Begin
After downloading the sequence to the pattern generator, you can also change the
behavior of the Trigger Out port (for details see “Sequence Trigger ” on page
147).
In the example above, the Trigger Out port has been set to Sequence Trigger mode,
and TrigOn is set for each block (as shown by the vertical trigger indicator).
Edit Button of a Block
To change the contents of a block, click its Edit button. This opens the Set Data
Block Parameter dialog.
Sequence Block Parameters
The Set Data Block Parameter dialog allows you to change the contents and the
trigger generation of a sequence block.
N O T E
If you select the Second Channel mode from the PG Aux Data Output dialog, the
same parameters for the Aux Data channel will also appear.
Choices are:
• None: The block may be present in the sequence but is completely ignored.
• Pause0: Pure zeros are generated when the block is executed. You can change
the block length, if desired.
• Pause1: Pure ones are generated when the block is executed. You can change
the block length, if desired.
• Block Marker: The block starts with 256 1s and 0s until block length. You can
use it to mimic the sequence marker functionality of the trigger output.
• PRBS: You can choose a PRBS of polynomial 2^n -1. The range of "n" is 7, 10,
11, 15, 23, or 31. You can change the block length, if desired.
• Divided Clock: You can use this option to generate the signal at every nth clock
pulse.
• Pattern: You can click Browse to launch Select User Pattern dialog. This dialog
opens a browser and search for the file that contains the pattern. You can open
3 Setting up Patterns
102 Agilent J-BERT N4903B High-Performance Serial BERT
Block Contents