GabrielTofvesson
8b9bd6e106
Generated some basic FastAdders Generalized FastAdder to include all fast math modules Other minor changes
59 lines
2.4 KiB
Verilog
59 lines
2.4 KiB
Verilog
// 2-bit fast adder
|
|
module FastAdder2(
|
|
input wire cin,
|
|
input wire [1:0] a,
|
|
input wire [1:0] b,
|
|
output wire [1:0] out,
|
|
output wire cout
|
|
);
|
|
wire [1:0] g = a & b;
|
|
wire [1:0] p = a ^ b;
|
|
assign out = a ^ b ^ {
|
|
(g[0]) | (p[0] & cin),
|
|
(cin)
|
|
};
|
|
assign cout = (g[1]) | (p[1] & g[0]) | (p[1] & p[0] & cin);
|
|
endmodule
|
|
|
|
// 4-bit fast adder
|
|
module FastAdder4(
|
|
input wire cin,
|
|
input wire [3:0] a,
|
|
input wire [3:0] b,
|
|
output wire [3:0] out,
|
|
output wire cout
|
|
);
|
|
wire [3:0] g = a & b;
|
|
wire [3:0] p = a ^ b;
|
|
assign out = a ^ b ^ {
|
|
(g[2]) | (p[2] & g[1]) | (p[2] & p[1] & g[0]) | (p[2] & p[1] & p[0] & cin),
|
|
(g[1]) | (p[1] & g[0]) | (p[1] & p[0] & cin),
|
|
(g[0]) | (p[0] & cin),
|
|
(cin)
|
|
};
|
|
assign cout = (g[3]) | (p[3] & g[2]) | (p[3] & p[2] & g[1]) | (p[3] & p[2] & p[1] & g[0]) | (p[3] & p[2] & p[1] & p[0] & cin);
|
|
endmodule
|
|
|
|
// 8-bit fast adder
|
|
module FastAdder8(
|
|
input wire cin,
|
|
input wire [7:0] a,
|
|
input wire [7:0] b,
|
|
output wire [7:0] out,
|
|
output wire cout
|
|
);
|
|
wire [7:0] g = a & b;
|
|
wire [7:0] p = a ^ b;
|
|
assign out = a ^ b ^ {
|
|
(g[6]) | (p[6] & g[5]) | (p[6] & p[5] & g[4]) | (p[6] & p[5] & p[4] & g[3]) | (p[6] & p[5] & p[4] & p[3] & g[2]) | (p[6] & p[5] & p[4] & p[3] & p[2] & g[1]) | (p[6] & p[5] & p[4] & p[3] & p[2] & p[1] & g[0]) | (p[6] & p[5] & p[4] & p[3] & p[2] & p[1] & p[0] & cin),
|
|
(g[5]) | (p[5] & g[4]) | (p[5] & p[4] & g[3]) | (p[5] & p[4] & p[3] & g[2]) | (p[5] & p[4] & p[3] & p[2] & g[1]) | (p[5] & p[4] & p[3] & p[2] & p[1] & g[0]) | (p[5] & p[4] & p[3] & p[2] & p[1] & p[0] & cin),
|
|
(g[4]) | (p[4] & g[3]) | (p[4] & p[3] & g[2]) | (p[4] & p[3] & p[2] & g[1]) | (p[4] & p[3] & p[2] & p[1] & g[0]) | (p[4] & p[3] & p[2] & p[1] & p[0] & cin),
|
|
(g[3]) | (p[3] & g[2]) | (p[3] & p[2] & g[1]) | (p[3] & p[2] & p[1] & g[0]) | (p[3] & p[2] & p[1] & p[0] & cin),
|
|
(g[2]) | (p[2] & g[1]) | (p[2] & p[1] & g[0]) | (p[2] & p[1] & p[0] & cin),
|
|
(g[1]) | (p[1] & g[0]) | (p[1] & p[0] & cin),
|
|
(g[0]) | (p[0] & cin),
|
|
(cin)
|
|
};
|
|
assign cout = (g[7]) | (p[7] & g[6]) | (p[7] & p[6] & g[5]) | (p[7] & p[6] & p[5] & g[4]) | (p[7] & p[6] & p[5] & p[4] & g[3]) | (p[7] & p[6] & p[5] & p[4] & p[3] & g[2]) | (p[7] & p[6] & p[5] & p[4] & p[3] & p[2] & g[1]) | (p[7] & p[6] & p[5] & p[4] & p[3] & p[2] & p[1] & g[0]) | (p[7] & p[6] & p[5] & p[4] & p[3] & p[2] & p[1] & p[0] & cin);
|
|
endmodule
|