Re: gEDA-user: problems with icarus ..

[Lars Segerlund <lars.segerlund@comsys.se>]

 Thanks,

  The same works for me, now I probably have to look at the source a 
bit :-( ....

 I was trying to use the lpm target, but I don't know if this is the 
correct way ?

 This is from the file fpga.txt in the source ...

The following is a list of architecture types that this code generator
supports.

* arch=lpm

This is a device independent format, where the gates are device types
as defined by the LPM 2 1 0 specification. Some backend tools may take
this format, or users may write interface libraries to connect these
netlists to the device in question.

 And here is th result of :

bash-2.05b$ iverilog -tfpga -parch=lpm addc.v
Unknown architecture arch=lpm
error: Code generation had errors.
bash-2.05b$

 So I think I have to look a bit futher.

 / Lars Segerlund.

Stephen Williams wrote:
> Lars Segerlund wrote:
>
> >  I am trying to synthesice a simple adder, and I am getting errors 
> > like this.
> >
> >  Does anybody know whats going wrong ?
> >
> > module addc(A, B, CIN, COUT, Q);
> >     input A, B, CIN;
> >     output COUT, Q;
> >     assign Q=A ^ B ^ CIN;
> >     assign COUT= (A & B) | (A & CIN) | (B & CIN);
> > endmodule
> >
> > bash-2.05b$ ../tools/bin/iverilog -S addc.v
> >
> >  Passes
> >
> > bash-2.05b$ ../tools/bin/iverilog -tfpga addc.v
> > UNSUPPORTED LOGIC TYPE: 19
> > UNSUPPORTED LOGIC TYPE: 19
> > UNSUPPORTED LOGIC TYPE: 1
> > UNSUPPORTED LOGIC TYPE: 1
> > UNSUPPORTED LOGIC TYPE: 1
>
> Including the version would help. However, I can tell you
> that those are AND and XOR gates that that particular code
> generator doesn't support yet. Try for example -tfpga -farch=virtex
> and see an improvement.