Trouble with ocean script for parametric analysis using ADE L

Hi Saikat,

The only way I can get this error is by using the paramAnalysis() on a variable without having first having declared it with desVar(). If I do both, then it works fine.

Are you defining it with desVar as well as paramAnalysis in the same run? If yes, which subversion are you using? (type getVersion(t) to report the version). If no, you'll have to define both...

Regards

Andrew

Hi Andrew, thanks for your quick response. I tried declaring that without any improvement. I have checked the version, which is sub-version  IC6.1.6-64b.500.8.

Here is the script I have written. My intention is to store the rise time at each input value, but it is returning only one value. Also showing the same warning, variable not define in the current design.

simulator( 'spectre )
design( "/homes/schatterjee/subvt_28/SUBVT28CORE_test/simulation/lslh_28nm_lvt_test_new/spectre/schematic/netlist/netlist")
resultsDir( "/homes/schatterjee/subvt_28/SUBVT28CORE_test/simulation/lslh_28nm_lvt_test_new/spectre/schematic" )
modelFile(
'("/homes/schatterjee/subvt_28/SUBVT28CORE_test/corners.scs" "")
)
definitionFile(
"models.scs"
)

getVersion(t)

;paramAnalysis("v_supply" ?values '(300 425 550 675 800 ))
paramAnalysis("v_supply" ?start 300 ?stop 800 ?step 100))
paramRun ()
;desVar( "v_supply" 300m)
desVar( "v_supply" ) ;this is disabled so as not to run from the default ocean scripu
;transient analysis till 10 us
analysis('tran ?stop "10u" )
selectResult( 'tran )
plot(getData("/A") getData("/Z") getData("/P1/s") getData("/P3/s") getData("/N1/d"))

;selectResult( 'tran )
tr = riseTime( v("/Z" ?result "tran") 0 nil 1 nil 10 90 nil "time" ); rise time calculation
tf = fallTime( v("/Z" ?result "tran") 1 nil 0 nil 10 90 nil "time" ); rise time calculation
tpd = delay( v("/A" ?result "tran") 0.150 1 "rising" v("/Z" ?result "tran") 0.500 1 "rising" nil nil); propagation delay calculation
printf("tr = %5.3f ns\n",tr*1e9)

plot(getData("tr"))

out = outfile("results_param.txt" "w")
outputs()

fprintf(out " rise time == %3.3f ns\n", tr*1e9);
close(out)

The desVar() has to be before the paramAnalysis(). Otherwise it doesn't know that the design variable exists because it hasn't been defined yet.

Regards,

Andrew.

I haven't tried that subversion (I'm out of the office this week so can't easily test), but I rather doubt it is version specific - this stuff hasn't changed in years, as far as I know.

I tried your OCEAN script (with a few small changes to the paths at the beginning) and with desVar() before the paramAnalysis. I also removed the additional close parenthesis at the end of paramAnalysis and also the space between paramRun and the subsequent (). This worked perfectly for me.

So you'll have to go to customer support if you can't get this working - I suspect it's something wrong in your setup rather than a tool bug, but hard for me to see from here.

Regards,

Andrew.

I saw this working somewhat. There are two strange developments though.

1. Out of 5 values chosen for v_supple, last 3 values are simulated only

2. The following expression is throwing error all of a sudden which was working before.

    printf("tr = %5.3f ns\n",tr*1e9)

the problem is showing at the multiplication with 1e9. Once I run clear at the end of simulation and rerun it, it is working.

Regards

Saikat

OK - so you said it wasn't working - then it's working but failing due to another error? PLEASE be clearer in what you're saying - it makes it very hard to make suggestions if you're not actually explaining yourself very well.

I see no reason why it would only simulate 3 out of 5 points. So maybe it is failing for some reason but we can't see the errors because you didn't post them.

The multiplication problem (you didn't show the error, so I'm guessing) may be because the calculation for tr failed to find the rise time and so was nil and hence the multiplication failed.

Kind Regards,

Andrew.

Hi Andrew,

to get rid of the weird behaviour I restarted virtuoso. After that I kept on getting more such weird behaviours. Later I figured out that it was using the old netlist which in turn was causing the failure. So the 1st hurdle regarding parametric analysis is over.

Now I am struggling with printing the data into a file. The simulation is successful and plotting the waveform. I intend to calculate the rise time, propagation delay and store into a file. There are two issues.

1. When I am using ocnPrint; the data are being stored but the name of column is printed as the expression.

ocnPrint(?output "r.txt" rise_time ?numberNotation 'none)

Result:

v_supply riseTime v("/Z" ?resultsDir "/homes/schatterjee/subvt_28/SUBVT28CORE_test/simulation/lslh_28nm_lvt_test_new/spectre/schematic" ?result "tran") 0 1 10 90 "time"

0.3         3.66751e-08
0.325     3.19714e-08
0.35       2.90787e-08
0.375     2.68736e-08
0.4         2.41881e-08

2. If I am using fprintf, nothing is printed inside the file. I am using the following command

fprintf(out "%f", rise_time)

But in both the cases the output of the simulation is successful.

Thanks in advance

Saikat Chatterjee

This is the expected behaviour of ocnPrint - it prints the column heading based on the expression for the waveform.

If you don't want that, you could set the expression attribute on the waveform object - e.g. drGetWaveformYVec(risetime)->expression="newname" before using ocnPrint, or you could use abDumpWaveform as outlined in http://community.cadence.com/cadence_technology_forums/f/38/p/19646/1285946#1285946

The fprintf won't work because the value is not a single floating point number - it's a waveform. fprintf() won't work (with %f) with a waveform object. It's the wrong kind of data.

Regards,

Andrew.

Hi Andrew,

I have followed the drGetWaveformYVec approach and used the following line of code.

drGetWaveformYVec(tr)->riseTime( v("/Z" ?result "tran") 0 nil 1 nil 10 90 nil "time" )="rise_time"

In the terminal I am seeing the following warning messages.

drGetWaveformYVec(tr)->riseTime( v("/Z" ?result "tran") 0 nil 1 nil 10 90 nil "time" )="rise_time"
                                                                                                                                        ^
PARSER WARNING at line 43 column 98 of file param.ocn
*WARNING* (Parser): illegal left hand side of assignment operator - funcall((drGetWaveformYVec(tr)->riseTime) v("/Z" ?result "tran") 0 nil 1 nil 10 90 nil "time")
t

But nothing is printed out.