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about the function of dbCreateParamInst

b0719r

Hi Everyone,

I am using the function of  dbCreateParamInst to draw a rf nmos with w, l, #f can be changed, however, when I use this function as below:

 paramList=list(list("wf" "float" fw) list("lf" "float" fl) list("nf" "int" nf))
    a=-(0.98*nf/4-0.2)
    b=-fw/2
   inst= dbCreateParamInst(newCV master nil a:b "R180" 1 paramList)

the mos size can not be changed, which seems as default size. I think the problem is the propName I use, it may be wrong. but I use this names before in the 90nm, it works ok, when I use them into 65nm, it doesn't work anymore. 

Is anyone have the idea that how to find the propName? or how to solve this problem?

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  • Hi Aleck

    Actually even though this is a common problem, it is a hard problem to resolve because it can possibly involve pcell callbacks and hence the pcell codes have to be examined. The COS solution which I had provided should be able to work for most cases. If it fails to work, it is better for you to file a service request to the local Cadence support so that somebody can assist you on this.

    Some pcells have a cyclic switch to control calculation of finger width or total width. This can sometimes break dbCreateParamInst. Hence we need to use the skillscript in the COS solution to force trigger all the callbacks. Sorry that actually I do not have much idea now on the cause of your problem. : )  Perhaps it might be a good idea to file a service request with us so that somebody can look into the issue.

    Best regards
    Quek

Reply

  • Hi Aleck

    Actually even though this is a common problem, it is a hard problem to resolve because it can possibly involve pcell callbacks and hence the pcell codes have to be examined. The COS solution which I had provided should be able to work for most cases. If it fails to work, it is better for you to file a service request to the local Cadence support so that somebody can assist you on this.

    Some pcells have a cyclic switch to control calculation of finger width or total width. This can sometimes break dbCreateParamInst. Hence we need to use the skillscript in the COS solution to force trigger all the callbacks. Sorry that actually I do not have much idea now on the cause of your problem. : )  Perhaps it might be a good idea to file a service request with us so that somebody can look into the issue.

    Best regards
    Quek

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