IF Statement with strings

You can't use an if statement like that in spectre, because the if statement is a "structural if" (you can include instances selectively based on the condition).

I thought that you might be able to do it with a ternary expression:

//
subckt testme n p
parameters port="m3" m3="m3" m1="m1" m2="m2"
parameters a=port==m3?30:port==m2?20:10
parameters c=port==m3?100f:port==m2?200f:300f
//parameters a=port==3?30:port==2?20:10
//parameters c=port==3?100f:port==2?200f:300f
r1 n np resistor r=a
c1 np p capacitor c=c
ends testme

I1 (n1 0) testme port="m3"
I2 (n2 0) testme port="m2"
I3 (n3 0) testme port="m1"

elements info what=inst where=screen

I thought initially that you can do a=port=="m3"?30:... but that gives a syntax error. With the == being done via parameters (indirectly), it gives no errors, but doesn't work.

Please contact customer support on this, because I think we should fix this, but it's best to do that with knowledge of who you are (this helps with prioritization, rather than me filing this as an internally found issue).

You can of course use a numerical value instead (so if port was set to 1,2,3) it then works fine (I commented out the ternary statements I used to prove that).

Regards,

Andrew.

I work for Intel Corporation / Foundry.

Could you help with a link where to submit a ticket, have not done that in a while?

BTW, The ternary expression wont work as I have more than 2 conditions. I might need to choose from up to seven strings. 

For now I think we both agree that i need an external mapping table to set the strings to numbers.

Mauricio

Hi Mauricio,

You can submit a Case with Customer Support at:   http://support.cadence.com.

best regards,

Tawna

Mauricio, I thought that I'd put the link - it's . Doing more than 2 is fine with tenary (you can chain them together) - I did that with the numerical version that showed above.