[Modified] Rewrite pipeline structure & finish exp11 test

lacpu/rtl/cpu/mul_div_top.v

@@ -0,0 +1,87 @@
+module mul_div_top(
+    input         clk,
+    input         reset,
+    input  [ 5:0] stall,
+    output        stallreq,
+
+    input  [ 3:0] mul_div_op,
+    input         mul_div_sign,
+
+    input  [31:0] a,
+    input  [31:0] b,
+
+    output [63:0] mul_div_result
+);
+    wire        stallreq_for_mul;
+    wire        stallreq_for_div;
+    wire        sign_flag;
+    wire [31:0] src_a;
+    wire [31:0] src_b; 
+    wire [31:0] result_h; 
+    wire [31:0] result_l; 
+    wire [31:0] quotient; 
+    wire [31:0] remainder;
+    
+    wire mul_en;
+    wire div_en;
+
+    wire [31:0] a_locked;
+    wire [31:0] b_locked;
+    wire        mul_en_locked;
+    wire        div_en_locked;
+
+    assign mul_en = mul_div_op[0] | mul_div_op[1];
+    assign div_en = mul_div_op[2] | mul_div_op[3];
+
+    assign sign_flag = a[31] ^ b[31];
+    assign src_a = (mul_div_sign || a[31]) ? ({1'b0, ~a[30:0] + 1'b0}) : a;
+    assign src_b = (mul_div_sign || b[31]) ? ({1'b0, ~b[30:0] + 1'b0}) : b;
+
+    mul_div_lock u_mul_div_lock(
+    .clk              (clk              ),
+    .reset            (reset            ),
+    .stall            (stall            ),
+    .a                (src_a            ),
+    .b                (src_b            ),
+    .mul_en           (mul_en           ),
+    .div_en           (div_en           ),
+    .stallreq_for_mul (stallreq_for_mul ),
+    .stallreq_for_div (stallreq_for_div ),
+    .a_locked         (a_locked         ),
+    .b_locked         (b_locked         ),
+    .mul_en_locked    (mul_en_locked    ),
+    .div_en_locked    (div_en_locked    )
+    );
+
+    mul u_mul(
+        .clk       (clk             ),
+        .reset     (reset           ),
+        .stallreq  (stallreq_for_mul),
+        .in_valid  (mul_en_locked   ),
+        .out_valid (),
+        .a         (a_locked        ),
+        .b         (b_locked        ),
+        .result_h  (result_h        ),
+        .result_l  (result_l        )
+    );
+
+    div u_div(
+        .clk       (clk             ),
+        .reset     (reset           ),
+        .stallreq  (stallreq_for_div),
+        .in_valid  (div_en_locked   ),
+        .out_valid (),
+        .a         (a_locked        ),
+        .b         (b_locked        ),
+        .quotient  (quotient        ),
+        .remainder (remainder       )
+    );
+
+    assign stallreq = stallreq_for_mul | stallreq_for_div;
+    assign mul_div_result = mul_div_op[0] ? result_l  :
+                            mul_div_op[1] ? result_h  :
+                            mul_div_op[2] ? quotient  :
+                            mul_div_op[3] ? remainder :
+                                            32'b0;
+    
+endmodule