"calcval" doesn't work with reliability simulation(for aged analysis)

Hi,

Perhaps you are missing ?getFirstSweepPoint or ?cornerName... This is very hard to debug without a complete context. A few screenshots would help, but it is probably best to file a case on support.cadence.com and work with you local AE over a screen-sharing session. 

BR

/Janko

hi,

Thx for the reply, will explain my self brightly.

i'm running gradual aging simulation of 10 years. i have 2 reliability analysis simulations, where i take fresh & aged expression outputs from source simulation, and using them as variable inputs for the "fresh" & "aged" test of the target simulation respectively:

The variable inputs are calcval functions of course:

variable for fresh: calcVal("phase_offset_error" "fresh_pb_vern132" ?relxName "aging_cp_vern132_test" ?ageValue "Fresh" ?getFirstSweepPoint t)

variable for aged: calcVal("phase_offset_error" "fresh_pb_vern132" ?relxName "aging_cp_vern132_test" ?ageValue "10" ?getFirstSweepPoint t)

The reason why i use "getFirstSweepPoint" is because the target simulation contains a sweep.

after running simulation, the "Fresh" input variable is valid, but for "aged" one i'm getting the following netlist error:

*Error* ERROR (ASSEMBLER-2736): Failed to evaluate the calcVal("phase_offset_error" "fresh_pb_vern132" ?relxName "aging_cp_vern132_test" ?ageValue "10" ?getFirstSweepPoint t) expression from test 'fresh_pb_hys_vern132_aged' because the evaluation data point cannot be determined.  Ensure that the provided corner nil exists and is enabled.

The only way it works is at the following options:

1. when running single corner, and changing calcval setups to"?getFirstSweepPoint nil"

2. when running few corners, but changing calcval setup to ?getFirstSweepPoint nil" & also adding ?cornerName" with a specific corner.

At the rest of the cases, it gives me a netlist Error.

it seems like calcval is not working the same when trying to move "aged" results from one test to another(or maybe the "gardual aging" is the problem here).

anyway, it will be lovely to get help..

Thx

Hi,

Yes, there used to be a problem with gradual aging, where it only "saw" the fist age point. This should have been fixed in latest versions. Anyway, your testcase might be specific in some sense, your results have multiple dimensions over sweeps, corners, multiple age points... it gets complicated for calcVal() to fetch the right thing from complex database. So, your example might still be broken. That's why I suggested filing an official case, so someone can investigate your specific case.

BR

/Janko 

thank you very much,

submitted a case...

In order to use the calcVal() feature for Reliability, we have to use the calcValForRel() function, which is built using calcVal() but is specific to the Reliability flow.

Its recommended to use the latest IC23.1 ISRs for running calcValForRel() like one shown: 

calcValForRel("phase_offset_error" ?relxName "aging_cp_vern132_test" ?ageValue "10")