Teledyne LeCroy PETracer EML Analyzer and Exerciser User Manual - Manual (Page 29)

PETracer EML User Manual Chapter 2: Hardware Description
LeCroy Corporation
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Indicators (LEDs)
Probing Characteristics
PETracer Recording Memory Size
4 GB per direction for CATC Trace capture, timing, and control information.
PETracer Basic Trigger Events
Breakout Board (BOB)
Filter in/out capabilities
UPAS:
Power Illuminated when Analyzer is powered on
System Status Illuminates during initialization/power up of UPAS. Blinks if Power On
Self Test (POST) fails.
Triggered Illuminates when a trigger event occurs.
Slot 1 Status Illuminates when the Analyzer in Slot 1 is recording
Slot 2 Status Illuminates when the Analyzer in Slot 2 is recording
PETracer EML 
Plug-in LEDs:
Activity Illuminated when the Analyzer is actively recording traffic data
Cable Setup Illuminates when cable is correctly connected between front of
Analyzer and Interposer.
Connection PETracer EML: PCI Express Slot Interposer
PETrainer EML: Slot Interposer card/ Device Emulation Interposer 
(end-point emulation)
Test Fixture (Root Complex emulation)
TLP Headers TLP Type: Mem, I/O, Cfg, Msg, Cpl, Any Traffic Class number
DLLP Messages Ack/Nak, InitFC1, InitFC2, UpdateFC, PM, Vendor
Link Conditions Link Alive, Electrical Idle Link Condition, TS1 Ordered Set,
TS2 Ordered Set, Skip Ordered Set, Electrical Idle Ordered Set,
FTS Ordered Set, DLLP, TLP, Training Control Bits
Payload Customizable Payload, Mask, Match
Errors DLLP CRC, TLP CRC, Delimiter, EDB (End-of-Bad Packet), Disparity,
Symbol, Idle Data Skip Late DLLP Ordered Set Format