[Modified] Switch soc_top&board to axi&xc7a200t

lacpu/rtl/mycpu/div.v

@@ -0,0 +1,52 @@
+module div(
+    input         clk,
+    input         reset,
+    output        stallreq,
+    input         in_valid,
+    output        out_valid,
+
+    input  [31:0] a,
+    input  [31:0] b,
+    
+    output reg [31:0] quotient, //商
+    output reg [31:0] remainder //余数
+);
+
+    reg  [ 5:0] cnt;
+    wire [31:0] sub_result;
+    wire        carry;
+    wire [31:0] temp;
+
+    always @ (posedge clk) begin
+        if (reset) begin
+            cnt <= 0;
+        end
+        else if (cnt != 0) begin
+            cnt <= cnt -1;
+        end
+        else if (in_valid) begin
+            cnt <= 32;
+        end
+    end
+
+    assign temp = {remainder[30:0],quotient[31]};
+    assign carry = temp < b ? 0 : 1;
+    assign sub_result = carry ? temp - b : temp;
+
+    always @ (posedge clk) begin
+        if (reset) begin
+            quotient <= 0;
+            remainder <= 0;
+        end
+        else if (cnt != 0) begin
+            {remainder, quotient} <= {sub_result, quotient[30:0], carry};
+        end
+        else if (in_valid) begin
+            quotient <= a;
+            remainder <= 0;
+        end
+    end
+    
+    assign out_valid = (cnt==0);
+    assign stallreq = in_valid | (~(cnt==0));
+endmodule