How to index spectre vector parameters (even possible?)?

Dan,

This is not possible, as spectre doesn't have an array index operator for vectors in the netlist language. One approach would be to define a function like this:

real getMYTOP(real myindex) {
    return myindex==0 ? 3.3 : \
	myindex==1 ? 2.7 : \
	myindex==2 ? 1.8 : \
	5.0
}

and then use getMYTOP(2) or getMYTOP(1) etc to retrieve the value:

R1 (n1 0) resistor r=getMYTOP(0)
R2 (n2 0) resistor r=getMYTOP(1)
R3 (n3 0) resistor r=getMYTOP(2)
R4 (n4 0) resistor r=getMYTOP(3)

My preference would be to not do a floating point comparison, so I would round to the  nearest before comparing (just in case):

real getMYTOP(real myindex) {
    return round(myindex)==0 ? 3.3 : \
	round(myindex)==1 ? 2.7 : \
	round(myindex)==2 ? 1.8 : \
	5.0
}

Andrew

To close the loop on this, I ended up using a Verilog-A model instead of trying to directly do it with spectre primitives.  Verilog-A in spectre is able to accept a vector parameter and an index and then pick out the desired one.

parameter integer slots = 4;
parameter integer valArray[0:(slots-1)] = '{slots{0}};
parameter integer valIndex = 0;

Then I can use valArray[valIndex] to pick out values.

To close the loop on this, I ended up using a Verilog-A model instead of trying to directly do it with spectre primitives.  Verilog-A in spectre is able to accept a vector parameter and an index and then pick out the desired one.

parameter integer slots = 4;
parameter integer valArray[0:(slots-1)] = '{slots{0}};
parameter integer valIndex = 0;

Then I can use valArray[valIndex] to pick out values.