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gEDA-user: problems with icarus ..


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
bash-2.05b$

Gives the above, the problem is that I cannot make sence of the error messages.

/ thanks, Lars Segerlund.