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spectre fails to finish transient sims

cADEUser

Simulation abort with error and does not finish. Any suggestion on this ?


Notice from spectre at time = 3.37543 ns during transient analysis `tran'.
Newton iteration fails to converge at time = 3.37543 ns step = 1.50009e-21 s.
Disaster recovery algorithm is enabled to search for a converged solution.
Notice from spectre at time = 3.37677 ns during transient analysis `tran'.
Newton iteration fails to converge at time = 3.37677 ns step = 1.50009e-21 s.
Disaster recovery algorithm is enabled to search for a converged solution.
Notice from spectre at time = 3.37821 ns during transient analysis `tran'.
Newton iteration fails to converge at time = 3.37821 ns step = 1.50009e-21 s.
Disaster recovery algorithm is enabled to search for a converged solution.
Notice from spectre at time = 3.37977 ns during transient analysis `tran'.
Newton iteration fails to converge at time = 3.37977 ns step = 1.50009e-21 s.
Disaster recovery algorithm is enabled to search for a converged solution.
Notice from spectre at time = 3.3815 ns during transient analysis `tran'.
Newton iteration fails to converge at time = 3.3815 ns step = 1.50009e-21 s.
Disaster recovery algorithm is enabled to search for a converged solution.
Further occurrences of this notice will be suppressed.
Error found by spectre at time = 3.5829 ns during transient analysis `tran'.
ERROR (SPECTRE-16192): No convergence achieved with the minimum time step specified.

Parents

  • You may want to contact customer support as debugging in the forum is quite hard. A good starting point would be to specify +diagnose on the Spectre command line (in recent IC versions there's a checkbox for this on the Setup->Environment form in ADE, or worst case you can type "+diagnose" in the User Command Line Option field on the same form). This will provide a lot more detailed diagnostics as to why the tilmestep is collapsing (it's probably some discontinuity or poor VerilogA model).

    Regards,

    Andrew.

Reply

  • You may want to contact customer support as debugging in the forum is quite hard. A good starting point would be to specify +diagnose on the Spectre command line (in recent IC versions there's a checkbox for this on the Setup->Environment form in ADE, or worst case you can type "+diagnose" in the User Command Line Option field on the same form). This will provide a lot more detailed diagnostics as to why the tilmestep is collapsing (it's probably some discontinuity or poor VerilogA model).

    Regards,

    Andrew.

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