Why does the VCS simulation of the Intel® Stratix® 10 PCIe* Hard IP return this RT Warning: More than one conditions match in the 'unique case' statement?

Description

VCS simulation of the Intel® Stratix® 10 PCIe* Hard IP returns warnings of the type shown below.

Warning-[RT-MTOCMUCS] More than one condition match in statement

/linux64/quartus//eda/sim_lib/synopsys/ct1_hssi_atoms_ncrypt.sv, 26

  More than one condition matches are found in 'unique case' statement inside

  pcie_example_design_tb.pcie_example_design_inst.dut.dut.altera_pcie_s10_hip_ast_pipen1b_inst.wys.ct1_hssi_x16_pcie_encrypted_inst.PROTECTED.next_state_PROC,

  at time 109295007000fs

The simulator is reporting the violation when considering transient values of the input signals instead of considering only the stable values for these inputs.  Therefore there is no functional issue, and the warning can be safely ignored.

Resolution

To work around this problem and suppress this warning, include the following user-defined option when running vcs_setup.sh:

sh vcs_setup.sh USER_DEFINED_COMPILE_OPTIONS="" USER_DEFINED_ELAB_OPTIONS="-xlrm\ uniq_prior_final"