Technical data

6. Troubleshooting
Startup Fails
The anti-virus software Sophos Endpoint Security might
inadvertendly detect the PCIe Link Training Suite as a virus and
prevent it from executing. Starting the Link Training Suite then leads
to an error message like "Windows cannot access the specified
device, path, or file". In this case, please check if the anti-virus
software blocked the executable file of the PCIe Link Training Suite
and add it to the exceptions. Note that you probably have to repeat
this procedure for some of the DLLs.
Slow Response
If you encounter a slow response of the PCIe Link Trainging Suite
user interface, this might be a result of a bad remote connection.
Probably the delay over ethernet is too high.
In most cases, it will be helpful to disable the BER polling and the
sequencer status polling. The BER polling can be disabled by simply
clicking the "Stop" button in the "Bit Error Rate Measurement" group.
The sequencer state polling can be disabled by un-checking the "Poll
Sequence Status" item in the "Options" menu.
Link Training Fails
If link training fails, you might want to check the following points:
• Did you already click "Apply" after connecting and adjusting
all your parameters? Note that just connecting doesn't
automatically download the pattern and settings!
• Is the injected jitter too high? Try reducing or disabling the
injected jitter in the "Jitter/SSC" dialog.
• Is the timing, the voltage levels and the de-emphasis correct?
• Is the selected link training sequence suitable for your DUT?
Probably using a tweaked sequence helps your DUT to get
into loopback. Try the "Preset..." button in the "Sequence to
Loopback Mode" dialog. This dialog opens when you click
"Edit Parameters..." in the "PCI Express Training Parameters"
group of the main window.
25 N5990A-301 Getting Started Guide