verilog-auto-inst-param-value

verilog-auto-inst-param-value is a variable defined in `verilog-mode.el'.
Its value is

nil

• This variable is safe as a file local variable if its value
  satisfies the predicate `verilog-booleanp'.

Documentation:
Non-nil means AUTOINST will replace parameters with the parameter value.
If nil, leave parameters as symbolic names.

Parameters must be in Verilog 2001 format #(...), and if a parameter is not
listed as such there (as when the default value is acceptable), it will not
be replaced, and will remain symbolic.

For example, imagine a submodule uses parameters to declare the size of its
inputs. This is then used by an upper module:

module InstModule (o,i);
parameter WIDTH;
input [WIDTH-1:0] i;
endmodule

module ExampInst;
InstModule
#(.PARAM(10))
instName
(/*AUTOINST*/
.i (i[PARAM-1:0]));

Note even though PARAM=10, the AUTOINST has left the parameter as a
symbolic name. If `verilog-auto-inst-param-value' is set, this will
instead expand to:

module ExampInst;
InstModule
#(.PARAM(10))
instName
(/*AUTOINST*/
.i (i[9:0]));

You can customize this variable.