Ahmad,
I'm not really sure about it but my attempt is :
A symbol is graphical interface to a design data.
The symbol is generally a black box (even it has other shapes ...)
that holds a given data and offers a set of pi/properties to interface
with the external world.
The design data could be :
1. A spice model for example. The "nmos" symbol from your CDS
analogLib can call a BSIM3 model, a CDL model and stuff ...
2. A piece of design or sub-design you pack into a box to make it
easier to include in a hierarchy. The sub-design itself could be made
by other symbils/primitives, ASCII file, like a verilog/VHDL/DSPF ....
etc.
Wow, It's not an easy question actually, Hope I was not rubbish in my
explanation ;-)
Well I would say that a symbol for a design data is what the body is
for a car. I know... I'm not good in poesy either ...
Hope other folks will help, I'm afraid y're going any further with my
explanation ...
God luck anyway !
Riad.
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