Using PEX 8648 SMA Based (SI) Card White Paper – Version 1.3
© 2010 by PLX Technology, Inc. All Rights Reserved
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9 Using Packet Generator in Two Card Set
In this example, the PLX PEX 8648 Packet Generator and Monitor features are used to generate PCI
Express heavy traffic across the link under test.
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Step 1) Program Port 3 as upstream port on card # 2 as outlined in Loopback test.
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Step 2) Install cards as outlined in Loopback test.
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Step 3) Programming packet generator and monitor features
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Under programs bring up “PLX GENMON”
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Go to ‘Performance Monitor’ box at top of screen. SI cards are identified by bus number.
The device nearest the root complex will have the lower bus number. Select this device
as monitor (either will work). Now depress “Open Monitor” button.
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With Monitor screen now open, select “Port 3 Ingress” and “Port 3 Egress”. You can
optionally deselect the Port 0 monitors. Depress “Start”. Minimize screen.
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Starting Traffic Generator:
Go back to main GENMON screen. Select the PEX 8648 chip with the higher bus
number – this is the required traffic generator. Go to “Load File” and load the SI
Card supplied script “Upstream_Exerciser.PLE”. Depress “Start”.
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Looking at the Monitor screen – traffic should now be evident.
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Step 4) Check bad DLLP and bad TLP counters in 8648 on card #1 and card #2
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Start standard SDK software.
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In either chip read Port 3 memory mapped registers for TLP/DLP error count. (Registers
x31E8h / x31ECh) These registers keep a running tab of DLLP and TLP errors on Port 3.
To clear write all “0” to each register.
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Step 5) Change SerDes settings and check for errors.
