Hi all

This is my first post in the forum.
I need to model an optocoupler (NSL-32SR3) that reduces its resistance with increasing current. I was able to deduce the mathematical equation from the curve using Excel.
Equation : R = 293,01 * i ^(-0,593)

But since I have little experience in Verilog I do not know how to create an expression that converts the input current to output resistance in the Verilog language.

Below is datasheet´s optocoupler.

Could someone give me some tips?

Thx
Leonardo