Teledyne LeCroy QPHY-PCIe - Manual (Page 21)

QPHY-PCIE Operator’s Manual
Variations exist for different source configurations: differential inputs on Input A or Input B, and
single inputs on Input A or Input B.
Signal Quality Test (CEM), System
This configuration is meant to run all of the transmitter tests on a PCIe System board. All the
variables are set to default. The limit set is use is PCIe 2.1. Both 2.5Gbps and 5.0Gbps Signal
Quality tests are run. Variations exist for different source configurations: differential inputs on
Input A or Input B, and single inputs on Input A or Input B.
QPHY-PCIE Test Descriptions
2.5 GT/s Signal Quality Tests
These tests use the “PCIe Compliance” Signal Type selection from the SDA II analysis software.
When “PCIe Compliance” is selected, SDA II uses the SigTest DLL in the background to
generate the Eye Diagrams and the Jitter results. This can only be done using 2.5GT/s signals.
• Mean Unit Interval
• Max Unit Interval
• Min Unit Interval
• Min Time Between Crossovers
• Data Rate
• Per Edge RMS Jitter
• Mean Median to Peak Jitter
• Max Median to Peak Jitter
• Min Median to Peak Jitter
• Mean peak-to-peak jitter
• Max peak-to-peak jitter
• Min peak-to-peak jitter
• Minimum transition eye voltage
• Maximum transition eye voltage
• Minimum non-transition eye voltage
• Maximum non-transition eye voltage
• Minimum transition eye voltage margin above eye
• Minimum transition eye voltage margin below eye
• Minimum non-transition eye voltage margin above eye
• Minimum non-transition eye voltage margin above eye
• Transition eye mask violations
• Non-transition eye mask violations
• Minimum Eye Width
• Differential peak to peak voltage
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