User guide
a browser and search for the file that contains the pattern. You can search for
files with the extentions
.ptrn
,
.txt
, or
.dat
.
If the pattern file contains two alternate patterns, you can also specify whether
the A or B pattern shall be generated (see also “Pattern File Specifications” on
page 66). If the pattern file contains just one pattern, your choice is ignored.
You cannot change the block length. It shows the length of the pattern as stored
in the file.
If the pattern length is not 512 bits or a multiple of 512 bits and this single block
is looped, the behavior depends on the loop end condition.
If the loop end condition is INFinite or determined by the Aux In port, then the
pattern is automatically repeated until 512 bits or a multiple thereof is reached.
In this case, the duration of the block will be longer than indicated. For example,
a pattern containing 17 bits will be repeated 512 times and the actual block
length will be 8704 bits. This has an impact on the trigger at block start.
You can also use the Select User Pattern dialog to create new pattern.
If this checkbox is enabled, a trigger spike will be output at the pattern generator's
Trigger Out connector whenever the execution of the block begins, provided that
the Trigger Out port is set to Sequence Trigger mode (see also “Sequence Trigger
” on page 147).
Click this button to launch Create New Pattern dialog. See “Create New Pattern”
on page 115 for details.
Click this button to open the Edit Pattern Window for Sequencer-Pattern Editor.
See “Edit Pattern Window for Sequencer-Pattern Editor” on page 110 for details.
Loops Within a Sequence
A loop defines the transition from the end of a block to the beginning of the same
or a previous block. It is not possible to jump into an existing loop. It is also not
possible to specify loops within loops (exept the default overall loop).
For information on how to create a loop, see “Creating a New Sequence” on page
99.
Setting up Patterns 3
Agilent J-BERT N4903B High-Performance Serial BERT 103
Block Trigger
Create Pattern
Edit Pattern(s)