Teledyne LeCroy Summit T24 PCIe Multi-lane Protocol Analyzer User Manual - Manual (Page 193)

Summit T24 PCI Express Multi‐Lane Protocol Analyzer User Manual 181
Flow Control Tracking Teledyne LeCroy
were available after TLP was transmitted. Hover the mouse over the field to display tool‐
tips.
Figure 10.17: 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 (see the
following screen capture). 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
credit fields for UpdateFC packets before the beginning of the trace. If the values of the
UpdateFC credit fields are different than the values in the first UpdateFC packet, Flow
Control tracking view will show that the first UpdateFC packet is releasing appropriate
amount of credits. By default, PETracer sets these values to match the first UpdateFC
packets in the trace.
Figure 10.18: Flow Control Setup Dialog