Added ALU

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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