Using your HA FA and 4bit CLA components implement a 4bit mu

Using your HA, FA, and 4-bit CLA components, implement a 4-bit multiplier using the Xilinx tools. Simulate the multiplier using enough cases to verify your circuit works. Implement the multiplier in the Digilent board using the eight slide switches as inputs (four switches per input) and the eight LED\'s as outputs, and demonstrate your circuit to the lab assistant. Submit your source and bit files for credit.

Solution

module array4x4(a,b,p);
//inputs
input [3:0]a,b;
//outputs
output [7:0]p;

//wires
wire [39:0]w;

//andgate instantiations
and a1(w[0],a[0],b[0]);
and a2(w[1],a[1],b[0]);
and a3(w[2],a[2],b[0]);
and a4(w[3],a[3],b[0]);

and a5(w[4],a[0],b[1]);
and a6(w[5],a[1],b[1]);
and a7(w[6],a[2],b[1]);
and a8(w[7],a[3],b[1]);

and a9(w[8],a[0],b[2]);
and a10(w[9],a[1],b[2]);
and a11(w[10],a[2],b[2]);
and a12(w[11],a[3],b[2]);

and a13(w[12],a[0],b[3]);
and a14(w[13],a[1],b[3]);
and a15(w[14],a[2],b[3]);
and a16(w[15],a[3],b[3]);

assign p[0]=w[0];
//full adders instatiations
fulladder a17(1\'b0,w[1],w[4],w[16],w[17]);
fulladder a18(1\'b0,w[2],w[5],w[18],w[19]);
fulladder a19(1\'b0,w[3],w[6],w[20],w[21]);

fulladder a20(w[8],w[17],w[18],w[22],w[23]);
fulladder a21(w[9],w[19],w[20],w[24],w[25]);
fulladder a22(w[10],w[7],w[21],w[26],w[27]);

fulladder a23(w[12],w[23],w[24],w[28],w[29]);
fulladder a24(w[13],w[25],w[26],w[30],w[31]);
fulladder a25(w[14],w[11],w[27],w[32],w[33]);

fulladder a26(1\'b0,w[29],w[30],w[34],w[35]);
fulladder a27(w[31],w[32],w[35],w[36],w[37]);
fulladder a28(w[15],w[33],w[37],w[38],w[39]);

//output assignments
assign p[1]=w[16];
assign p[2]=w[22];
assign p[3]=w[28];
assign p[4]=w[34];
assign p[5]=w[36];
assign p[6]=w[38];
assign p[7]=w[39];

endmodule

FULL ADDER
module fulladder(a,b,c,s,ca);
//inputs
input a,b,c;
//outputs
output s,ca;

//full adder assignments.
assign s=(a^b^c);
assign ca=((a&b)|(b&c)|(c&a));
endmodule