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problem with dbFindProp()....?

Prabhu The ICL

Hi, All! I am using Cadence IC514 version.
I found a code which increases the parameters by a given factor in schematic.(i.e width and length etc...)
My problem is as follows...
I have two instances pch_25_mac with
              1)    "w"="5u" and "l"="500n" and                 2)    "w"="5u" and "l"="280n"(this is the default value for this parameter)
dbFindProp(inst prop) is returning it's id on first instance but it is not when the parameter value is default value.
How to resolve this problem...
Here is the code that I have got....

procedure(CCS_ModifyWL(lib cell factor "ttn")
let((cv new propId)
 cv = dbOpenCellViewByType( lib cell "schematic" "" "a")
 when( cv
   foreach(inst cv~>instances
     ;foreach(prop list("w" "l")
     cdf1=cdfGetInstCDF(inst)
     foreach(prop list("w" "wf" "l" "wr" "lr" "sumW" "sumL")
     if(member(prop cdf1~>parameters~>name) then
       ;when(propId=dbFindProp(inst prop)
   propId = cdf1~>prop
         new = sprintf(nil "%g" cdfParseFloatString(propId~>

value)*factor)
         printf("Changing instance %s property %s from %s to %s.\n"
           inst~>name propId~>name propId~>value new)
         dbReplaceProp(inst propId~>name "string" new)
       );when the prop exists
     );foreach prop
   );foreach inst
   ;dbCheck(cv)
   ;dbSave(cv)
   ;dbClose(cv)
 ); when the cellview was opened ok
);let
);procedure


Thanks in Advance

Prabhakar. K --- The Layout Engineer
SoCtronics

 

Parents

  • This is correct behaviour. dbFindProp only deals with db property objects. When CDF is being used, the default values are not (normally) stored on the instance, and so there is no property object to find.

    One way to handle this is to use cdfGetInstCDF (as you have) and then replace the line:

       propId = cdf1~>prop

    with

       propId = get(cdf1 prop)

    I didn't test the code, but I think it should all work with that change

    Regards,

    Andrew.

Reply

  • This is correct behaviour. dbFindProp only deals with db property objects. When CDF is being used, the default values are not (normally) stored on the instance, and so there is no property object to find.

    One way to handle this is to use cdfGetInstCDF (as you have) and then replace the line:

       propId = cdf1~>prop

    with

       propId = get(cdf1 prop)

    I didn't test the code, but I think it should all work with that change

    Regards,

    Andrew.

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