Manipulating a single Instance Iterations in Virtuoso

I am trying to manipulate the parameters of a single instance of an array (I1<1024:1>). The instances contain a simple RC network and a current source modelling a rather complex circuit. All the instances are connected in series using a bus-notation. Now I need to add a unique delay to every single one of the current sources in order to simulate a propagating signal through this chain of instances.

My idea was to use a skill function to deduce the number of the instance and use it as a multiplier for a constant delay and add it as a parameter of the internal current source. This way all 1024 instances should have a unique delay that is a function of its instance number.

I am fairly new to Skill and seem to be stuck..I managed to access a single instance using ilInst~>name but this returns me the complete name i.e. I1<x>. That's about as far as I came..

Does anyone have experience with this kind of problem or any hints that might help?

battosai said:

... any hints that might help?

Click to expand...

Try searching (or asking) in the dedicated !

According to Andrew Beckett in the Cadence Forums my original approach is not possible. Therefore I have changed my approach a bit. I added the delay parameter i neet to change to the cell using pPar("delay"). In that way the netlister adds the parameter directly to the instance call instead of only the subcircuit. In that way all i need to manipulate is the value of the parameter for every instance. Since it's the first time doing netlist manipulations and the lack of good examples i wrote a custom PrintParameter function that simply overwrites the delay parameter with a fixed value to see if it works:


I have made the according changes in the CDF editor (under Simulation Information in the spectre settings under netlistProcedures i added MYPrintParameters) for the cell and saved theMYPrintParameters function in the libInit.il file in the library folder and tried to generate the netlist. Unfortunatly it returns the error:


Do I have to add another parameter in the CDF editor or where did I go wrong?
I am grateful for any input!