Visible to Intel only — GUID: zgf1711161170441
Ixiasoft
Visible to Intel only — GUID: zgf1711161170441
Ixiasoft
A.2.5. Using the Agilex™ 5 Link Inspector
The Link Inspector is found under the PCIe Link Inspector tab after opening the Debug Toolkit.
The Link Inspector is enabled by default when the Enable Debug Toolkit is enabled.
When the Dump LTSSM Sequence to Text File button is initially clicked, a text file (ltssm_sequence_dump_p0.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.
LTSSM State | Timer (ns) | LTSSM State # 0x0 DETECT_QUIET | 5284883 | 0 0x1 DETECT_ACTIVE | 197 | 1 0x2 POLLING_ACTIVE | 25399190 | 2 0x5 PRE_DETECT_QUIET | 1050 | 3 0x0 DETECT_QUIET | 640830 | 4 0x1 DETECT_ACTIVE | 297 | 5 0x2 POLLING_ACTIVE | 25307183 | 6 0x3 POLLING_COMPLIANCE | 17897600 | 7 0x2 POLLING_ACTIVE | 65697 | 8 0x4 POLLING_CONFIG | 24558927 | 9 0x7 CONFIG_LINKWD_START | 147 | 10 0x8 CONFIG_LINKWD_ACCEPT | 893 | 11 0x9 CONFIG_LANENUM_WAIT | 1827 | 12 0xa CONFIG_LANENUM_ACCEPT | 127 | 13 0xb CONFIG_COMPLETE | 1097 | 14 0xc CONFIG_IDLE | 1070 | 15 0x11 L0 | 50 | 16 0xd RECOVERY_LOCK | 487 | 17 0xf RECOVERY_RCVRCFG | 3137 | 18 0xe RECOVERY_SPEED | 2627750 | 19 0xd RECOVERY_LOCK | 40 | 20 0x20 RECOVERY_EQ0 | 10485737 | 21 0x21 RECOVERY_EQ1 | 257 | 22 0x22 RECOVERY_EQ2 | 9357540 | 23 0x23 RECOVERY_EQ3 | 12973550 | 24 0xd RECOVERY_LOCK | 133 | 25 0xf RECOVERY_RCVRCFG | 453 | 26 0x10 RECOVERY_IDLE | 63 | 27 0x11 L0 | 187 | 28 0xd RECOVERY_LOCK | 790 | 29 0xf RECOVERY_RCVRCFG | 2323 | 30 0xe RECOVERY_SPEED | 2235913 | 31 0xd RECOVERY_LOCK | 40 | 32 0x20 RECOVERY_EQ0 | 14500 | 33 0x21 RECOVERY_EQ1 | 197187 | 34 0x22 RECOVERY_EQ2 | 5052290 | 35 0x23 RECOVERY_EQ3 | 8748963 | 36 0xd RECOVERY_LOCK | 73 | 37 0xf RECOVERY_RCVRCFG | 243 | 38 0x10 RECOVERY_IDLE | 40 | 39 0x11 L0 | - | Current The current LTSSM state is: L0
Each LTSSM monitor has a FIFO storing the time values and captured LTSSM states. When you choose to dump out the LTSSM states, reads are dependent on the FIFO elements and will empty out the FIFO.
The Link Inspector only writes to its FIFO if there is a state transition. In cases where the link is stable in L0, there will be no write and hence no text file will be dumped.
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.