AMS Simulator ConnectLib problem

Hi All,

I am new to Cadence AMS simulators. I have some circuits for which
the connect modules which are supplied with cadence distribution in
affirma_ams are not sufficient. I need to customize that rules. I have
customized it properly. But whenever I try to compile and elaborate
the design by "netlist and run" cadence complains and says that it is
unable to find the customized connect rules. But I have kept the
customized rules in the same connectLib in my project directory...I am
using spectre as analog solver..please help and please suggest
suitable solutions..

 

Hi there,

What do you mean by 'I have customized it properly' ? If your compile/
elaboration fails then it means your customization was not as good as
you thought ...

there are few steps that you need to follow to create a customized
work Lib:

1. Create the verilogAMS files for your connect Modules.
Say I want to create a 1V connect module with following spec:
Vsup=1.0, Vthi=0.666, Vtlo=0.333, Vlow=0
I copy the 1.8V connect module from my IUS stream , i.e
$IUSHOME/tools/affirma_ams/etc/connect_lib/connectLib/
ConnRules_18V_full_fast/connect/verilog.vams

The ConnRules_1V0_full_fast I'm about to create needs the following
files :

Bidir_2.vams
ConnRules_1V0_full_fast.vams
E2L_2.vams
E2R.vams
ER_bidir.vams
L2E_2.vams
L2E_2_CPF.vams
R2E_2.vams

All these files have been copied form :
$IUSHOME/tools.lnx86/affirma_ams/etc/connect_lib

2. Prepare the environment:
You need to have a correct hdl.var and cds.lib to compile the
libraries
- An example of hdl.var is:

##########
softinclude $AMSHOME/inca/files/hdl.var
define ncuse5x
define cdslib ./cds.lib
Define WORK rkLib
##########

- An example of cds.lib is

------
softinclude $AMSHOME/tools/inca/files/cds.lib
DEFINE analogLib $CDSHOME/tools/dfII/etc/cdslib/artist/analogLib
DEFINE basic $CDSHOME/tools/dfII/etc/cdslib/basic
DEFINE sample $CDSHOME/tools/dfII/samples/cdslib/sample
Define rkLib ./rkLib
Define myconnectLib ./rk_connect_lib/rkConnectLib
------

3. Compile the above connect modules using the following commands:

ncvlog -ams -use5x -work myconnectLib ./rk_connect_lib/
ConnRules_1V0_full_fast.vams
ncvlog -ams -use5x -work myconnectLib ./rk_connect_lib/L2E_2.vams
ncvlog -ams -use5x -work myconnectLib ./rk_connect_lib/E2L_2.vams
ncvlog -ams -use5x -work myconnectLib ./rk_connect_lib/Bidir_2.vams
ncvlog -ams -use5x -work myconnectLib ./rk_connect_lib/E2R.vams
ncvlog -ams -use5x -work myconnectLib ./rk_connect_lib/R2E_2.vams
ncvlog -ams -use5x -work myconnectLib ./rk_connect_lib/ER_bidir.vams
ncvlog -ams -use5x -work myconnectLib ./rk_connect_lib/L2E_2_CPF.vams


4. Create a connectRules.il file with the above connect modules using
the following command:
genConnRulesFile -destpath ./rk_connect_lib/rkConnectLib -lib
rkConnectLib ./rk_connect_lib/*.vams

5. copy over rk_connect_lib into your cadence working dir and update
your cds.lib by adding:
DEFINE rkConnectLib ./rk_connect_lib/rkConnectLib

6. Fire up Cadence and the ADE and load the created connect module.
they must come in the list of available connect modules.

This should be working,
Let me know whether you need further details !

Cheers,
Riad.

 

Hi Riad,

I am a student of IIT Kharagpur in India and working with National
Semiconductor UK in John Gough's group. I got your contact from
Sheikh. I will try this one and will let you know the results.
Somehow, we failed to load the customized connect rules in Cadence
Library though we modified it with the the help of GUI from the ADE
window. Sheikh also tried a lot. I will let you know after trying
this.
Thanks for your reply.
Cheers,
Debjit.

 

Hi Debjit,

Hope you have managed to make this working.
I have assumed in my previous post that you have created the necessary
UNIX directories and file to go through the flow.
Also, make sure that you put the 'connectRules.il' file in the
connectLib library. That would in ./rk_connect_lib/rkConnectLib in
above example.
Step 4 is only needed if your run AMS Designer from the ADE interface.
As far as I can remember, your working flow is rather based on the HED
plugin.
Anyway, Sheikh is fit enough o make this working. Just give me a shout
otherwise !
Also, you might ask Sheikh to get in touch with Cadence to see whether
they could provide him with something. they should have notes about
this somewhere.

Cheers,
Riad.

 

Hi Riad,

I will try and let you know. But the only thing is Sheikh is leaving
NSUK on 7th August, 2009 i.e. this Friday. We'll miss a real nice guy
with ready help.

Cheers,
Debjit.