creating memristor symbol and linking it to subcircuit

Hi,

I am trying to create a symbol for memristor and link it to the subcircuit file of the following type. I am using cadence virtuoso schematic editor and hspice as the simulator. It will be of immense help if anybody can help me out with the steps to follow. I will be grateful.


* MEMRISTOR
* Ron, Roff - Resistance in ON / OFF States
* Rinit - Resistance at T=0
* D - Width of the thin film
* uv - Migration coefficient
* p - Parameter of the WINDOW-function
* for modeling nonlinear boundary conditions
* x - W/D Ratio, W is the actual width
* of the doped area (from 0 to D)
*

.SUBCKT memristor Plus Minus
+ Ron=100 Roff=16K Rinit=11K D=10N uv=10F p=10

* DIFFERENTIAL EQUATION MODELING *

. PARAM f(x,p)= '1-pow((2*x-1),(2*p))'
Gx 0 x value='I(Emem)*uv*Ron/pow(D,2)*f(V(x),p)'
Cx x 0 1 IC='(Roff-Rinit)/(Roff-Ron)'
Raux x 0 1T

* RESISTIVE PORT OF THE MEMRISTOR *
Emem plus aux value='-I(Emem)*V(x)*(Roff-Ron)'
Roff aux minus Roff

*Flux computation*

Eflux flux 0 value={SDT(V(plus,minus))}

*Charge computation*

Echarge charge 0 value={SDT(I(Emem))}

* WINDOW FUNCTIONS
* FOR NONLINEAR DRIFT MODELING *

*window function, according to Joglekar
.func f(x,p)={1-(2*x-1)^(2*p)}
*proposed window function
*;.func f(x,i,p)={1-(x-stp(-i))^(2*p)}
.ENDS memristor


Regards

Supriyo