P-Tile Avalon® Memory-mapped Intel® FPGA IP for PCI Express* User Guide

ID 683268
Date 7/14/2021
Document Table of Contents

6.2.6. Using the P-Tile Link Inspector

The Link Inspector is found under the PCIe Link Inspector tab after opening the Debug Toolkit:

Figure 49. View of the Link Inspector

When the Dump LTSSM Sequence to Text File button is initially clicked, a text file (ltssm_sequence_dump_p*.txt) with the LTSSM information is created in the location from where the System Console window is opened. Depending on the PCIe topology, there can be up to four text files. Subsequent LTSSM sequence dumps will append to the respective files.

Figure 50. Example LTSSM Sequence Dump (Beginning)
Figure 51. Example LTSSM Sequence Dump (End)

Each LTSSM monitor has a FIFO storing the time values and captured LTSSM states. The FIFO is written when there is a state transition. When you want to dump the LTSSM sequence, a single read of the FIFO status of the respective core is performed. Depending on the empty status and how many entries are in the FIFO, successive reads are executed.