Teledyne LeCroy Summit T28 PCIe Multi-lane Protocol Analyzer User Manual - Manual (Page 130)

Teledyne LeCroy Decoding Traffic
118 Summit T28 PCI Express Multi‐Lane Protocol Analyzer User Manual
 If AER_CAP_VER = 1 and it is a Root Port or RC Event Collector, there are 14 DWs
(00h to 34h)in the total AER Capability structure.
 If AER_CAP_VER = 2 then, there are 18 DWs (00h to 44h) in the total AER Capa‐
bility structure.
In fact, there are PCI‐E 3.0 compliant devices that have AER_CAP_VER=1.
Example H/W:
A PCI‐E 3.0 device that supports Multiple Header Recording, but does NOT support TLP
Prefixes. This device is allowed to have AER_CAP_VER=1, and
Multiple_Header_Recording_Capable=1
Therefore, the Teledyne Lecroy software decodes the
Multiple_Header_Recording_Capable field regardless of the value of AER_CAP_VER.
6.13.2 Link
Link level decode is composed of TLP packets matched with a corresponding ACK or
NAK coming from the opposite direction.
6.13.3 Split
Split level decode is composed of two Link transactions, the Request TLP and the
Completion TLP from the other direction.