I am using irun (09.20-s016 version) for ams simulation.
in the amsd definition, want to stub one subblock, but ncelab complain about couldn't find the subckt.

Here is the netlist structure.

1 ata_top.scs: (analog top def, will be included in the top vams model)


subckt ata_top refclk out11 in12 out13 agnd avdd

 subckt buf_ata in out agnd avdd
 I1 (net3 out agnd avdd) ad_inv_hv1
 I7 (net3 net2 avdd agnd avdd agnd) HV45_O25_IVX4
 I8 (net1 in avdd agnd avdd agnd) HV45_O25_IVX4
 I12 (net1 net2 agnd avdd) ad_inv_hv1 L=300n WN=1.0u NFN=1 WP=2.0u \
       NFP=1
 ends buf_ata

 subckt HV45_O25_IVX4 Z A vdd2v5 gnd vdd2v5s gnds
   M0 (Z A gnd gnds) nch_25_mac l=2.7e-07 w=7e-07 multi=1 \
       nf=1 sd=220.0n ad=0.1225p as=0.1365p pd=1.75u ps=1.79u nrd=0.25 \
       nrs=0.278571 sa=1.95e-07 sb=1.75e-07 sca=8.00617 scb=0.00670683 \
       scc=0.000255114 mismatchflag=1 globalflag=1 totalflag=0
   M1 (Z A vdd2v5 vdd2v5s) pch_25_mac l=2.7e-07 w=9.8e-07 \
       multi=1 nf=1 sd=220.0n ad=0.1764p as=0.1862p pd=2.32u ps=2.34u \
       nrd=0.183673 nrs=0.193878 sa=1.9e-07 sb=1.8e-07 sca=4.10603 \
       scb=0.00361727 scc=0.000169127 mismatchflag=1 globalflag=1 \
       totalflag=0
  ends HV45_O25_IVX4

I11 (refclk out11 agnd avdd) buf_ata
I7 (out22 in12 avdd agnd avdd agnd) HV45_O25_IVX4
I34 (out13 out22 avdd agnd avdd agnd) HV45_O25_IVX4

ends ata_top



2 stimuli.vams: (package will module TB1)

//
`include "constants.vams"
`include "disciplines.vams"

`timescale 1ns/1ps

module TB1 (refclk_vcd, in_vec, avdd, agnd);

input refclk_vcd;
input in_vec;

input avdd;
input agnd;

reg refclk1;
reg refclk2;

electrical avdd;
electrical agnd;


parameter real Vavdd = 2.5 from [0:inf);        // Analog supply

initial begin
   refclk1=0;
   #10 refclk1=1;
end

always #10 refclk1=~refclk1;

initial begin
   refclk2=0;
   #10 refclk2=1;
end

always #10 refclk2=~refclk2;

analog begin
 V(avdd) <+ transition(Vavdd,0,10n,10n);       // 2.5V analog supply
 V(agnd) <+ 0;                                 // analog ground
end // analog

// The line below works fine
ata_top I55 (.refclk(refclk1), .out11(out11), .in12(refclk2), .out13(out13), .agnd(agnd), .avdd(avdd) );

endmodule



3 now, if i define the amsd as:

amsd{
     ie vsup=2.5
     portmap subckt=ata_top autobus=yes
     config cell=ata_top use=spice
        }

the irun works, give me correct results
but if i want to stub the subckt of buf_ata, which define the amsd as:

amsd{
     ie vsup=2.5
     portmap subckt=ata_top autobus=yes
     config cell=ata_top use=spice

     portmap stub=ata_top match=spice
     config cell=buf_ata use=stub
        }

ncelab complain that couldn't match the cell "buf_ata", i also tried to put hierichey in, like ata_top.buf_ata, or change to instant name, didn't work


Is anyone help on how to define stub in amsd?
Really appreciate!!!