Output expression has evaluation errors for corner sims

Hi Bill,

See How to apply round() or any other unary function to a waveform. You'd need to change the round((VAR("NUM_PTS") / VAR("NUM_AVGS"))) part to abApplyToWave('round VAR("NUM_PTS") / VAR("NUM_AVGS")) - having accessed the code through the article.

Regards,

Andrew

Hi Andrew, 

Thank you for the function - that does help.  But the expression only works in certain situations.   When I do a single run and look at the automatic plot at the end of the run things look OK, but then for a corner run I'm still get errors.   Maybe I don't understand

1.   How does the output processing work in ADE for expression dependencies (e.g. if I have expressions dependent on other expressions or variables then does it matter what order I put them in or will the output processing iterate to figure out all the dependencies?)   

2.   I think if I run a single case then the expression evaluates to a number and the function is happy with the number but if I run a corner run maybe the expression evaluates to some kind of list or array object that the function chokes on?   Is there some kind of typecasting I should be doing in general to get all the expressions into the correct type(s) of objects whether I've done a single run or a corner run?

Thank you again for all your help you give to the Cadence community!

Bill Huff

Hi Bill,

I was going to move the other post across to this thread, but I see you re-posted (so I just deleted the post in the wrong thread; no harm done!)

What errors are you getting? First of all, are you ensuring that the abApplyToWave function is registered with the calculator or did you just load it in the CIW?

To answer your two questions:

1. The order dependency is taken care of anyway - you don't have to worry about it
2. The function I wrote should take care of running with different flavours of data - direct numbers, vectors, waveforms and families - there's a cond() statement within that handles that. So that's why it should work without needing to do anything special.

Regards,

Andrew

Hi Andrew,

Thanks again for all your help.   Sorry for the delay; I ran a few more experiments.

1.   I'm not sure how to use the abApplyToWave function for an expression with a numerical value (such as my tstart and tstop expressions).   I just want to use the abApplyToWave to take care of different flavors of data as you say but not apply a function.   I tried using abApplyToWave(nil tstart) but that gave an error.

2.  I'll try to describe a few different versions of the expression and the results.   All of these plot fine if I run a single case (no corners)

psd(VT("/v1") 1e-08 1.6394e-05 32768 ?windowName "Hamming" ?smooth 5 ?windowSize 16384 ?detrending "None" ?cohGain 1)

=> Automatically plots at end of corner run; plots OK from calculator after corner run

psd(VT("/v1") 1e-08 1.6394e-05 abApplyToWave('round VAR("NUM_PTS")) ?windowName "Hamming" ?smooth 5 ?windowSize abApplyToWave('round (VAR("NUM_PTS") / VAR("NUM_AVGS"))) ?detrending "None" ?cohGain 1)

=> Does NOT automatically plot at end of corner run; but does plot OK from calculator.    I didn't see anything in CIW or CDS.log about why it didn't plot.

psd(VT("/v1") tstart tstop abApplyToWave('round VAR("NUM_PTS")) ?windowName "Hamming" ?smooth 5 ?windowSize abApplyToWave('round (VAR("NUM_PTS") / VAR("NUM_AVGS"))) ?detrending "None" ?cohGain 1)

=> Does not plot at end of corner run or from calculator

Error message when attempting to plot from calculator: ("round" 0 t nil ("*Error* round: argument #1 should be a number (type template = \"n\")" srrWave:0x67b3ace0))("times" 0 t nil ("*Error* times: can't handle (nil * srrWave:0x67b3ad00)"))("drPSD" 0 t nil ("*Error* drPSD: argument #2 should be a number (type template = \"gnnxSnnxSl\")" nil))

output .csv file follows for reference:

Name,Type,Output,EvalType,Plot,Save,Spec
,net,/v1,point,,t,
vt_v1,expr,VT("/v1"),point,t,,
clip_v1,expr,clip(vt_v1 tstart tstop),point,,,
NUM_PTS,expr,round(VAR("NUM_PTS")),point,t,,
NUM_AVGS,expr,round(VAR("NUM_AVGS")),point,,,
WIN_LENGTH,expr,round((NUM_PTS / NUM_AVGS)),point,,,
fsamp,expr,VAR("fsamp"),point,,,
tsamp,expr,VAR("tsamp"),point,t,,
tstart,expr,(tstop - (NUM_PTS * tsamp)),point,t,,
tstop,expr,0.00016394,point,t,,
clip2,expr,clip(vt_v1 tstart tstop),point,t,,
psd16,expr,psd(VT("/v1") 1e-08 1.6394e-05 32768 ?windowName "Hamming" ?smooth 5 ?windowSize 16384 ?detrending "None" ?cohGain 1),point,t,,
psd17,expr,psd(VT("/v1") 1e-08 1.6394e-05 abApplyToWave('round VAR("NUM_PTS")) ?windowName "Hamming" ?smooth 5 ?windowSize abApplyToWave('round (VAR("NUM_PTS") / VAR("NUM_AVGS"))) ?detrending "None" ?cohGain 1),point,t,,
psd18,expr,psd(VT("/v1") tstart tstop abApplyToWave('round VAR("NUM_PTS")) ?windowName "Hamming" ?smooth 5 ?windowSize abApplyToWave('round (VAR("NUM_PTS") / VAR("NUM_AVGS"))) ?detrending "None" ?cohGain 1),point,t,,