Teledyne LeCroy Summit T3-16 PCIe Multi-lane Protocol Analyzer User Manual - Manual (Page 210)

Teledyne LeCroy Flow Control Tracking
198 Summit T3‐16 PCI Express Multi‐Lane Protocol Analyzer User Manual
Figure 10.19: Data Flow Columns Dialog
10.7 Flow Control Tracking
The Flow Control View mode highlights portions of the packets that affect flow control
and displays flow control values. Flow control values shown at the beginning of Link
Transaction display the credit values that were available prior to TLP transmission. Flow
control values shown at the end of the Link Transaction display the credit values that
were available after TLP was transmitted. Hover the mouse over the field to display tool‐
tips. Refer to the following screen capture.
Figure 10.20: Flow Control Display
If the trace includes Flow Control initialization, PETracer detects the amount of available
credits based on the values advertised in InitFC packets. If the InitFC packets are not in
the trace, the amount of available credits can be set using the FC Credit Setup dialog.
Select View > FC Credits Setup... displays the FC Credit Setup dialog (see the following
screen capture).
For each virtual channel that is present in the trace you need to specify the amount of
available credits before the beginning of the trace. You can also specify the values of