| Yuki Azuma | 10b8f64 | 2021-10-05 15:52:38 +0900 | [diff] [blame] | 1 | module alu_controller(opcode, alu_ctrl); |
| 2 | input [3:0] opcode; |
| 3 | output [3:0] alu_ctrl; |
| 4 | |
| 5 | assign alu_ctrl = alu_control(opcode); |
| 6 | |
| 7 | function [3:0] alu_control(input [3:0] opcode); |
| 8 | begin |
| 9 | case(opcode) |
| 10 | 4'b0001: alu_control = 4'b0000; |
| Cra2yPierr0t | 39c95b0 | 2021-10-13 21:56:29 +0900 | [diff] [blame^] | 11 | 4'b0010: alu_control = 4'b1000; |
| Yuki Azuma | 10b8f64 | 2021-10-05 15:52:38 +0900 | [diff] [blame] | 12 | 4'b0011: alu_control = 4'b0001; |
| 13 | 4'b0100: alu_control = 4'b0010; |
| 14 | 4'b0101: alu_control = 4'b0011; |
| 15 | 4'b0110: alu_control = 4'b0100; |
| 16 | 4'b0111: alu_control = 4'b0101; |
| 17 | 4'b1000: alu_control = 4'b0110; |
| 18 | 4'b1001: alu_control = 4'b0111; |
| 19 | endcase |
| 20 | end |
| 21 | endfunction |
| 22 | endmodule |
