AN829 simulation ran but failed

Dear Support and Expert

I am learning PCIe, DMA and DDR. AN829 is a good example for A10 platform. I have made minor modification to get the project compiled and execute simulation in Quartus 21.3 environment, but the simulation will stop and shown the following message. it is really hard for a beginner to figure out the problem,

INFO: 132429 ns RP LTSSM State: DETECT.ACTIVE
# INFO: 133469 ns RP LTSSM State: POLLING.ACTIVE
# INFO: 146333 ns RP LTSSM State: DETECT.QUIET
# INFO: 146669 ns RP LTSSM State: DETECT.ACTIVE
# INFO: 147709 ns RP LTSSM State: POLLING.ACTIVE
# INFO: 160573 ns RP LTSSM State: DETECT.QUIET
# INFO: 160909 ns RP LTSSM State: DETECT.ACTIVE
# INFO: 161949 ns RP LTSSM State: POLLING.ACTIVE
# INFO: 174813 ns RP LTSSM State: DETECT.QUIET
# INFO: 175149 ns RP LTSSM State: DETECT.ACTIVE
# FATAL: 175149 ns LTSSM does not change from DETECT.QUIET
# FAILURE: Simulation stopped due to Fatal error!
# FAILURE: Simulation stopped due to error!
# ** Note: $stop : ../../../ip/top_hw_tb/DUT_pcie_tb_ip/altera_pcie_a10_tbed_191/sim/altpcietb_ltssm_mon.v(161)
# Time: 175149 ns Iteration: 1 Instance: /top_hw_tb/dut_pcie_tb/dut_pcie_tb/g_bfm/p_dut_ep/altpcietb_bfm_top_rp/ltssm_mon
# Break in Function ebfm_log_stop_sim at ../../../ip/top_hw_tb/DUT_pcie_tb_ip/altera_pcie_a10_tbed_191/sim/altpcietb_ltssm_mon.v line 161

=================== function

function ebfm_log_stop_sim;
input success;
integer success;

begin
if (success == 1)
begin
$display("SUCCESS: Simulation stopped due to successful completion!");
$display("Simulation passed");
`ifdef VCS
$finish;
`else
$stop ;
`endif
end
else
begin
$display("FAILURE: Simulation stopped due to error!");
`ifdef VCS
$finish;
`else

$stop ; //********************** this is the line 161

`endif
end
ebfm_log_stop_sim = 1'b0 ;
end
endfunction

I don't know is it possible to make this AN829 simulation work on A10 GX environment. if it worked, it would provide a very powerful learn tools for the beginner.

appreciate your input and suggestion.

Thank you,

David