Verilog circuit

Well ... how are a, b and c connected at the bottom of the MUX? The left input is b, then a and right is c. So 000 ... 111 is a combination of b, a, c.

In VHDL it would be:

signal sel := std_logic_vector(2 downto 0);

begin

sel <= b & a & c;

with sel select y <= a and b when "000", c when "001", a and b when "010", '1' when "011", a and b when "100", '0' when "101", a and b when "110", a xor b when "111";

And now ask ChatGPT to translate this in Verilog:

Question:

Translate

signal sel := std_logic_vector(2 downto 0);

begin

sel <= b & a & c;

with sel select y <= a and b when "000", c when "001", a and b when "010", '1' when "011", a and b when "100", '0' when "101", a and b when "110", a xor b when "111";

to Verilog.

Answer:

reg [2:0] sel;

always @* begin case (sel) 3'b000, 3'b010, 3'b100, 3'b110: y = a & b; 3'b001: y = c; 3'b011: y = 1'b1; 3'b101: y = 1'b0; 3'b111: y = a ^ b; endcase end

assign sel = b & a & c;

Mattia wrote:

i need to write this circuit in verilog. Thanks.

Wow... nice to know!

So GO FOR IT!

Gustl B. wrote:

Answer:

...

assign sel = b & a & c;

Ouch... obviously chatGPT needs to learn a bit more about the differences between VHDL and Verilog.

module mux(input b,a,c, output reg y ); always@(b,a,c) begin if(!b) assign y=c; else if(b) begin assign y=a; if(a==1 && c==1) assign y=1'b0; end end
endmodule

this code was successfully executed on xilinx vivado

testbench

module tb; reg b,a,c; wire y; mux uut(b,a,c,y); initial begin b=1'b0; a=1'b0; c=1'b0; #10 b=1'b0; a=1'b0; c=1'b1; #10 b=1'b0; a=1'b1; c=1'b0; #10 b=1'b0; a=1'b1; c=1'b1; #10 b=1'b1; a=1'b0; c=1'b0; #10 b=1'b1; a=1'b0; c=1'b1; #10 b=1'b1; a=1'b1; c=1'b0; #10 b=1'b1; a=1'b1; c=1'b1;

#20 $finish; end endmodule

sorry if am too early😅