Verilog-AMS

Hi,

I want to set up Verilog-AMS simulation environment in cadence-
spectre. Please help me to get this done by suggesting some set up
guidelines and license requirement.

Thanks & regards
Samiran

 

Hi,

I have setup verilog-ams simulation env. Now I have written a simple
capacitor model as follows:

---------------------------------------------------------------------------------------------------------------------------------------------
//Verilog-AMS HDL for "SAMIRAN", "testams" "verilogams"

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

module testams ( );
real q=1.609E-19;
real L=300E-9;
inout p,n;
electrical p,n;
analog begin
I(p,n) <+ (9.654E-17) * ddt(V(p,n));
end
endmodule
---------------------------------------------------------------------------------------------------------------------------------------------

But when I saved the file it returned an error saying:

"Cannot find ncvlog executable from your path. Please update your path
to point to the correct executable or use vmsNcvlogExecutable variable
to specify the executable to use."

Please help me on this.

Thanks & regards
Samiran

 

Hi,

Please ensure IUS is in your UNIX path variable.
The IUS stream holds the nc-executables.
Does this make any sens to you ?

Regards,
Riad.

 

Hi Samiran,

You must have IUS (latest is IUS82) stream of Cadence Distribution
installed in your system. Then ensure the following paths are added in
your environment. Assuming bash shell, the paths should be in your
bashrc as follows:


export PATH="$IUS_INST_DIR/tools/bin:$PATH"
export PATH="$IUS_INST_DIR/tools/dfII/bin:$PATH"
export PATH="$IUS_INST_DIR/tools/simvision/bin:$PATH"


Hope this will solve your problem.

Thanks and Regards !!!!

Cheers !!!

Debjit.

 

In my .bashrc file following lines are already included:

---------------------------------------------------------------------------------------------------------------------------------------------
export AMSHOME=/usr/local/cadence/IUS81ISR_lnx86
export CDSHOME=/usr/local/cadence/IC5141USR6_lnx86
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$AMSHOME/tools/lib:$CDSHOME/
tools/lib
export PATH=$PATH:$AMSHOME/tools/bin:$AMSHOME/tools/dfII/bin:$AMSHOME/
tools/simvision/bin
---------------------------------------------------------------------------------------------------------------------------------------------

are these any different from the export statement mentioned in the
above mail. Please let me know.

Regards
Samiran

 

I guess I have to set the environment in .cshrc file. Because I start
icfb by executing " tcsh >> source .cshrc >> icfb " command. But I am
not sure what exactly the syntax should be for cshrc. Please guide me.

Thanks & regards
Samiran.

 

I tried to update .cshrc file by including the following command
lines:

---------------------------------------------------------------------------------------------------------------------------------------------
setenv AMSHOME /usr/local/cadence/IUS81ISR_lnx86
set path=($path /usr/local/cadence/IUS81ISR_lnx86/tools/bin)
set path=($path /usr/local/cadence/IUS81ISR_lnx86/tools/dfII/bin)
set path=($path /usr/local/cadence/IUS81ISR_lnx86/tools/simvision/bin)
---------------------------------------------------------------------------------------------------------------------------------------------

After this there is no error that was popping out earlier. But I got
another error saying: VAMS *E, EDPS: Parsing of verilog-ams file
failed.

The exact error stack I got:

----------------------------------------------------------------------------------------------------------------------------------------------
ncvlog: 08.10-s005: (c) Copyright 1995-2008 Cadence Design Systems,
Inc.

ncvlog: *W,DLCPTH (./cds.lib,11): cds.lib Invalid path '/usr/local/
cadence/IUS81ISR_lnx86/tools/dfII/etc/cdslib/artist/
analogLib' (cds.lib command ignored).
DEFINE basic $CDS_INST_DIR/tools/dfII/etc/cdslib/basic
|
ncvlog: *W,DLCPTH (./cds.lib,12): cds.lib Invalid path '/usr/local/
cadence/IUS81ISR_lnx86/tools/dfII/etc/cdslib/basic' (cds.lib command
ignored).
DEFINE cdsDefTechLib $CDS_INST_DIR/tools/dfII/etc/cdsDefTechLib
|
ncvlog: *W,DLCPTH (./cds.lib,13): cds.lib Invalid path '/usr/local/
cadence/IUS81ISR_lnx86/tools/dfII/etc/cdsDefTechLib' (cds.lib command
ignored).
DEFINE avTech /eda/cadence/assura_5141-317-018/lnx86/tools/assura/etc/
avtech/avTech
|
ncvlog: *W,DLCPTH (./cds.lib,15): cds.lib Invalid path '/eda/cadence/
assura_5141-317-018/lnx86/tools/assura/etc/avtech/avTech' (cds.lib
command ignored).
`include "vsrc.vams"
|
ncvlog: *E,COFILX (/home/sdam/SAMIRAN/smpl_ckt/verilogams/verilog.vams,
3|19): cannot open include file 'vsrc.vams'.
`include "resistor.vams"
|
ncvlog: *E,COFILX (/home/sdam/SAMIRAN/smpl_ckt/verilogams/verilog.vams,
5|23): cannot open include file 'resistor.vams'.
ground gnd;
|
ncvlog: *E,ILLGND (/home/sdam/SAMIRAN_PLL/smpl_ckt/verilogams/
verilog.vams,9|10): illegal ground node 'gnd' [3.4.4(AMSLRM)].
----------------------------------------------------------------------------------------------------------------------------------------------

The file I have tried to compile:

----------------------------------------------
`include "disciplines.vams"

module resistor (p,n);
parameter real r=0;
inout p,n;
analog
V(p,n) <+ r*I(p,n)
endmodule
----------------------------------------------

 

Samiran wrote, on 04/07/10 08:29:

This doesn't quite add up. I'm assuming that the file
/home/sdam/SAMIRAN/smpl_ckt/verilogams/verilog.vams actually contains include
lines for vsrc.vams and resistor.vams and ground. Please show the contents of
that file - it's hard to see why it would be complaining about those include
files unless they actually exist in the source!

By the way, you should be able to get rid of the *W,DLCPTH warnings by fixing
your cds.lib. You can either change the $CDS_INST_DIR references in your cds.lib
to $CDSHOME (since you have that env var defined) or use things like:

analogLib
$(inst_root_with:tools/dfII/bin/icfb)/tools/dfII/etc/cdslib/artist/analogLib


Regards,

Andrew.