#E53#E53
Q: How do you use the loopback tests?
Loopback
Diagnostics
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Included
with your ETS2k or ETSusb software is a folder called: C:\ETS2k\SysTest\Sw-001-LoopBack
Or C:\ETSusb\SysTest\Sw-001-LoopBack
This folder
contains a collection of SET, TRN, and CMT
files. The purpose of these files is to verify something that the
internal
diagnostic
|
software cannot test; that the
driver/receiver signals are valid all
the way out to the DUT board, and that they are able to drive/sense
voltage and
current levels in compliance with specifications. To
use these files, you must have a special DUT
board called a “Loopback board”. The LoopBack board simply connects
pins
together on a per-PEB basis. That is,
the Least-significant 16 pins are connected to the Most-significant 16
pins in
the following manner:
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PEB1
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PEB2
|
PEB(etc) |
||||||||||||||||||||||||||||||||
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And so on for all remaining PEBs installed in system |
| The
concept allows each driver to drive signal into another pin’s receiver.
This
tests the function of the relays at each driver/receiver junction that
connects
tester channels to the DUT board. It also tests the signal connectivity
through
the loadboard to the DUT board. LoopBack
Files SW-001-C-<number
of pins>-<Ls2Ms or Ms2Ls>.<extension>
Where: So
when loading the file SW-001-C-32-Ls2Ms.set, the .set and .trn files in
which
channels 1-16 will drive a vector pattern into channels 17-32. The patterns will be virtually identical, so
a RUN of functional vectors verifies that connectivity is good.
After
running SW-001-C-32-Ls2Ms.set, load and run SW-001-C-32-Ms2Ls.set &
.trn.
This verifies the test pattern with data direction reversed. In
addition to functional patterns, there are four DCPMU tests in each
.set
file. These tests check all pins for
proper voltage and drive characteristics. For each .set file loaded,
all DCPMU
tests should be run in addition to the functional vectors. |