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AMS netlister adding verilog attibutes

MikeVP

I have one project where the AMS simulations are running smoothly, and another project that makes me want to pull my hair out.  I'm looking for differences, and I'm seeing that the AMS netlister is adding extra verilog attibutes to netlist.vams.

Here is what I see:

// Library - hscmoscells, Cell - xn2, View - schematic
// LAST TIME SAVED: Apr 15 15:37:19 2022
// NETLIST TIME: Aug 6 13:47:02 2024
`timescale 1ns / 10ps

`worklib hscmoscells
`view schematic

(* cds_ams_schematic *)
(* dfII_lib="hscmoscells", dfII_cell="xn2", dfII_view="schematic", worklib_name="hscmoscells", view_name="schematic", last_save_time="Apr 15 15:37:19 2022" *)

module xn2 (zn, a0, a1);

The sim is failing because:

xmvlog: *E,WKLNDF (/nobackup/<user>/<proj>/simulation/<sim lib>/<sim bench>/maestro/results/maestro/ExplorerRun.0/1/xx/netlist/digital/netlist.vams,21583|17): library 'hscmoscells' is not defined.

The (* dfII ...*) line is not in the netlist of the smoothly running project test bench.  Is there an env var that I can set so this isn't added?  Also, why does it care what library that cell is from when the netlist is right there?

My versions:

xrun: 23.03-s09

virtuoso: 20.1.500.3100

  • Andrew Beckett
    in reply to MikeVP

    Those attributes normally end up in the netlists but get filtered by the time the netlist.vams file is created (I don't know what controls whether they end up in the resulting netlist.vams file - I can't find any info on this).

    I'll ask R&D, but in the meantime do you have any reflib or makelib settings on the Options->AMS Simulator->Main tab? This is a wild guess...

    Probably the best thing is to contact customer support (submit a support case after logging in) and please reference this post.

    Andrew

  • MikeVP
    in reply to Andrew Beckett

    My sim is running now after deleting the simulation directory.  Sorry, I forgot the cardinal rule before posting:

    1. Restart, and if that doesn't work:

    2. Delete sim directory

    Thanks for the quick reply, though.

  • Andrew Beckett
    in reply to MikeVP

    R&D pointed me at a potential root cause of this. If you're using a version before IC6.1.8/ICADVM20.1 ISR21 (which version are you using?) there was an issue where this could happen if you changed the config view associated with the maestro view. By this I mean that you switched from one config view to another maestro view, not just changing something within the config.

    The fix was to force a full re-netlisting when this was detected.

    Andrew

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