How To Create A Memory Segment - HP 81200 User Manual

Creating and Editing Segments
158
2 Choose the Segment Pool.
Segments in the global segment pool can be accessed from all settings.
Segments in the local segment pool can only be accessed from the
current setting.
3 Enter or edit the Segment Name.
Enter a name that explains the contents or purpose of the segment.
4 Choose the Segment Type.
Type Memory means that a free programmable pattern is stored in the
database.
Type PRBS or PRWS means that an algorithm for a pseudo random bit or
word sequence is stored in the database. This saves time when the data
is downloaded to the channels. After download to the channel memory
the pseudo random sequence is stored as a pattern.
N O T E
PRWS segments are mainly used for testing multiplexers/demultiplexers.
The first terminal of the DUT input port (counted from top to bottom as
shown in the Connection Editor) gets the first state of the generated
random sequence, followed by the next lower pin, and so on. If you had set
up a 4-bit port and bit count starts with one, the first terminal would
receive bit 1, 5, 9, and so on.
A PRWS segment requires that the connectors used are in the same
module, and if it spans across multiple modules, these modules have to be
in adjacent slots.

How to Create a Memory Segment

Start the New Segment dialog (see "How to Start Creating a New
Segment" on page 157). Once you have decided to create a memory
segment, fill in the remaining fields:
1 Specify the State Coding. Choices are 01 or 0x1.
The state coding 01 specifies that every bit of the segment occupies one
bit in memory. This is adequate for all data segments to be downloaded
to generator channels.
The state coding 0x1 can be used for expected data. This coding enables
the x-character used to denote don't care bits. State coding 0x1 specifies
that each bit of the segment occupies two bits in memory.
2 Set the width and length of the new data segment.
The width represents the number of pins included in a port and defines
the number of traces.
The length is the pattern length and thus the number of vectors.
HP 81200 Data Generator/Analyzer Platform User Guide, Revision 2.1
How to Create a New Segment