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Diffstat (limited to 'alu/v0.1/alu.v')
| -rw-r--r-- | alu/v0.1/alu.v | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/alu/v0.1/alu.v b/alu/v0.1/alu.v new file mode 100644 index 0000000..da62f66 --- /dev/null +++ b/alu/v0.1/alu.v @@ -0,0 +1,57 @@ +module alu( + input [7:0]a,b, + input [3:0]alu_sel, + output [7:0]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}; +assign carry_out = tmp[8]; //carry out result + +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*b; + 4'b0011: //division + alu_result = a/b; + 4'b0100: //logical shift left + alu_result = a<<1; + 4'b0101: //logical shift right + alu_result = a>>1; + 4'b0110: //rotate right + alu_result = {a[6:0],a[7]}; + 4'b0111: //rotate left + alu_result = {a[0],a[7:1]}; + 4'b1000: //and + alu_result = a&b; + 4'b1001: //or + alu_result = a|b; + 4'b1010: //xor + alu_result = a^b; + 4'b1011: //nor + alu_result = ~(a|b); + 4'b1100: //nand + alu_result = ~(a&b); + 4'b1101: //xnor + alu_result = ~(a^b); + 4'b1110: //greate comparison + alu_result = (a>b)?8'b1:8'b0; + 4'b1111: + alu_result = (a==b)?8'b1:8'b0; + default: + alu_result = a+b; + endcase +end + + +endmodule
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