blob: b1ed7ea08b5b3a4057f84b5fc8724b61bc6127de (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
|
// represents the Ben Eater 8bit computer - ALU
`timescale 1us/1us
module eater_alu (
input wire clk_in,
input wire en_output_in,
input wire subtract_n_add_in,
input wire [7:0] A_in,
input wire [7:0] B_in,
output wire [7:0] bus_out
);
wire [7:0] result /* verilator public */;
assign result = subtract_n_add_in ? (A_in - B_in) : (A_in + B_in);
// wire [7:0] xormask = {8{subtract_n_add_in}};
// wire [7:0] B_neg_if = B_in ^ xormask;
// wire [7:0] result2 = A_in + B_neg_if + subtract_n_add_in;
zbuffer buffer (
.data_in(result),
.en_output_in(en_output_in),
.data_out(bus_out)
);
endmodule
|
