[Help] HSIM/VCS Co-Simulation: Undefined port in module instantiation

[XJT12]

Hi everyone,

When I was using HSIM/VCS to compile a Verilog-SPICE design, I got a compilation error.
The error message is as follows:

Error-[UPIMI-E] Undefined port in module instantiation
fpu_add_flat_nc.v, 6620
Port "QN" is not defined in module 'DFFX1' defined in "saed90nm.cdl", 2019
Module instance: DFFX1 fpu_add_exp_dp_i_add_exp_out1_q_reg_9_( .D (n2840),
.CLK (fpu_add_exp_dp_clk), .Q (fpu_add_exp_dp_add_exp_out1[9]), .QN
(n4846));

However, in the SPICE model of this cell, I do have the QN port defined:

.subckt DFFX1 CLK D Q QN VDD VSS
mmp03 net06 D VDD VDD p12 l = 0.1u w = 0.33u m = 1
mmp012 CLKP CLKN VDD VDD p12 l = 0.1u w = 0.21u m = 1
mmp7 net7 CLKN net2 VDD p12 l = 0.1u w = 0.45u m = 1
mmp1 net1 CLKP net06 VDD p12 l = 0.1u w = 0.33u m = 1
mmp12 net7 net8 net10 VDD p12 l = 0.1u w = 0.21u m = 1
mmp6 net1 net2 net4 VDD p12 l = 0.1u w = 0.33u m = 1
mmp8 net8 net7 VDD VDD p12 l = 0.1u w = 0.4u m = 1
mmp10 net10 CLKP VDD VDD p12 l = 0.1u w = 0.21u m = 1
mmp13 Q net8 VDD VDD p12 l = 0.1u w = 1.12u m = 1
mmp4 net4 CLKN VDD VDD p12 l = 0.1u w = 0.33u m = 1
mmp14 QN net7 VDD VDD p12 l = 0.1u w = 1.12u m = 1
mmp011 CLKN CLK VDD VDD p12 l = 0.1u w = 0.21u m = 1
mmp2 net2 net1 VDD VDD p12 l = 0.1u w = 0.33u m = 1
mmn14 QN net7 VSS VSS n12 l = 0.1u w = 0.56u m = 1
mmn8 net8 net7 VSS VSS n12 l = 0.1u w = 0.21u m = 1
mmn012 CLKP CLKN VSS VSS n12 l = 0.1u w = 0.21u m = 1
mmn1 net1 CLKN net06 VSS n12 l = 0.1u w = 0.21u m = 1
mmn13 Q net8 VSS VSS n12 l = 0.1u w = 0.5u m = 1
mmn2 net2 net1 VSS VSS n12 l = 0.1u w = 0.21u m = 1
mmn7 net7 CLKP net2 VSS n12 l = 0.1u w = 0.21u m = 1
mmn6 net1 net2 net6 VSS n12 l = 0.1u w = 0.21u m = 1
mmn03 net06 D VSS VSS n12 l = 0.1u w = 0.21u m = 1
mmn10 net12 CLKN VSS VSS n12 l = 0.1u w = 0.21u m = 1
mmn4 net6 CLKP VSS VSS n12 l = 0.1u w = 0.21u m = 1
mmn12 net7 net8 net12 VSS n12 l = 0.1u w = 0.21u m = 1
mmn011 CLKN CLK VSS VSS n12 l = 0.1u w = 0.21u m = 1


.ends DFFX1

This error seems quite strange and unusual to me. Is there anyone who met this kind of problems and happen to know how to fix it?

Thanks