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Diffstat (limited to 'alu/v0.1_16bit/alu.v')
| -rw-r--r-- | alu/v0.1_16bit/alu.v | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/alu/v0.1_16bit/alu.v b/alu/v0.1_16bit/alu.v new file mode 100644 index 0000000..05bf227 --- /dev/null +++ b/alu/v0.1_16bit/alu.v @@ -0,0 +1,46 @@ +module alu( + input [15:0]a,b, + input [2:0]alu_sel, + output [15:0]alu_out, + output carry_out +); + +reg [7:0]alu_result; +wire [8:0]tmp; + +assign alu_out=alu_result; //result from alu +//??? +assign tmp = {1'b0,a}+{1'b0,b}; + + +always @(*) +begin + case (alu_sel) + 4'b0000: //addition + alu_result = a+b; + 4'b0001: //substraction + alu_result = a-b; + 4'b0010: //multiplication + alu_result = ~a; + 4'b0011: //division + alu_result = a<<b; + 4'b0100: //logical shift left + alu_result = a>>b; + 4'b0101: //logical shift right + alu_result = a&b; + 4'b0110: //rotate right + alu_result = a|b; + 4'b0111: //rotate left + begin + if (a<b) alu_result = 16'd1; + else alu_result = 16'd0; + end + default: + alu_result = a+b; + endcase +end + +assign zero = (alu_result==16'd0) ? 1'b1: 1'b0; + + +endmodule
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