pass the value of a parameter from "init.s"(cdsSpice) to hs

[Xuejun Zhang]

A parameter is set in the "init.s" file which is written in cdsSpice
syntax. This parameter is used in the hspice models.

For example, in the "init.s" the parameter "a" is set using cdsSpice
command
"set a=1"

Then in the hspice model, I will use "a" in some equations, for
example
..param b=a*2

The questions are,
how can I translate the value of the parameter "a" to hspiceS.
I have tried the following method, but not successful,

1.create a file called "test.s" with content of "\.param a =a".
2.create a file called "hspice.include" with content of "use test"
3.inlcude "hspice.include" into the Inlcude/Stimulus File Field with
the syntax cdsSpice.
4. generate raw and final netlist.

The final netlist shows
.param a 1.000

as you can see, the symbol "=" is missing, which is needed for hspice.

So the question is how I can pass the value of a parameter from init.s
to hspice.

Thanks

 

[Andrew Beckett]

Don't get cdsSpice parameters and hspice parameters mixed up. They are
completely separate and distinct.

cdsSpice is used as a preprocessor, and so will expand cdsSpice parameters to
fixed numbers before the hspice final netlist is created.

As for doing what you're doing, I can't easily test it right now, but probably
escaping the = might be a good idea.

Andrew.

On 24 Jun 2004 12:29:16 -0700, xuejun_zhang2004@hotmail.com (Xuejun Zhang)
wrote:

A parameter is set in the "init.s" file which is written in cdsSpice
syntax. This parameter is used in the hspice models.

For example, in the "init.s" the parameter "a" is set using cdsSpice
command
"set a=1"

Then in the hspice model, I will use "a" in some equations, for
example
.param b=a*2

The questions are,
how can I translate the value of the parameter "a" to hspiceS.
I have tried the following method, but not successful,

1.create a file called "test.s" with content of "\.param a =a".
2.create a file called "hspice.include" with content of "use test"
3.inlcude "hspice.include" into the Inlcude/Stimulus File Field with
the syntax cdsSpice.
4. generate raw and final netlist.

The final netlist shows
.param a 1.000

as you can see, the symbol "=" is missing, which is needed for hspice.

So the question is how I can pass the value of a parameter from init.s
to hspice.

Thanks

--
Andrew Beckett
Senior Technical Leader
Custom IC Solutions
Cadence Design Systems Ltd