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jdes's avatar
jdes
Icon for New Contributor rankNew Contributor
2 years ago

Quartus 23.2 crashes on fitter : Internal Error: Sub-system: PTI

Hello, Quartus is repetitively crashing during the fitting stage with the following error : ``` Internal Error: Sub-system: PTI, File: /quartus/tsm/pti/pti_tdb_builder_nightfury_hssi.cpp, Line: ...
Hdl
SyafieqS's avatar
SyafieqS
Icon for Super Contributor rankSuper Contributor
2 years ago

Hi Julia,


Update:


The issue appears to occur when is_pa_core (is phase aligned to core) is set to "true", which enables feedback compensation via iqtxrxclk wires. However, this mode doesn't have a valid feedback timing model, so is_pa_core can only be set to "false". A possible workaround would be to disable is_pa_core and the iqtxrxclk parameters. Try editing phyfpll/synth/phyfpll.v and change these 3 parameters:


is_pa_core from "true" to "false"

cmu_fpll_pll_iqclk_mux_sel from "iqtxrxclk0" to "power_down"

cmu_fpll_fpll_iqtxrxclk_out_enable from "fpll_iqtxrxclk_out_enable" to "fpll_iqtxrxclk_out_disable"


I am able to pass the flow with the workaround. Please validate this at your end and let me know any update.

The fix will be planned soon.