[Modified] Switch soc_top&board to axi&xc7a200t

lacpu/rtl/mycpu/bru.v

@@ -0,0 +1,56 @@
+module bru(
+    input  [31:0] pc,
+    input  [31:0] rj_value,
+    input  [31:0] rkd_value,
+    input  [31:0] imm,
+
+    input  [ 8:0] branch_op,
+
+    output        br_taken,
+    output [31:0] br_target
+);
+
+    wire inst_jirl;   
+    wire inst_b;      
+    wire inst_bl;     
+    wire inst_beq;    
+    wire inst_bne; 
+    wire inst_blt;
+    wire inst_bge;
+    wire inst_bltu;
+    wire inst_bgeu;
+
+    wire rj_eq_rd;
+    wire rj_lt_rd;
+    wire rj_ltu_rd;
+
+    assign {inst_beq,
+            inst_bne,
+            inst_blt,
+            inst_bge,
+            inst_bltu,
+            inst_bgeu,
+            inst_jirl,
+            inst_bl,
+            inst_b
+           } = branch_op;
+
+    assign rj_eq_rd  = (rj_value == rkd_value);
+    assign rj_ltu_rd = (rj_value <  rkd_value);
+    assign rj_lt_rd  = (rj_value[31] && ~rkd_value[31]) ? 1'b1 :
+                       (~rj_value[31] && rkd_value[31]) ? 1'b0 :
+                                                          rj_ltu_rd;
+    assign br_taken  = (   inst_beq  &&  rj_eq_rd
+                        || inst_bne  && !rj_eq_rd
+                        || inst_blt  &&  rj_lt_rd
+                        || inst_bge  && !rj_lt_rd
+                        || inst_bltu &&  rj_ltu_rd
+                        || inst_bgeu && !rj_ltu_rd
+                        || inst_jirl
+                        || inst_bl
+                        || inst_b
+                        );
+    
+    assign br_target = ({32{inst_beq|inst_bne|inst_bl|inst_b|inst_blt|inst_bge|inst_bltu|inst_bgeu}} & (pc + imm))
+                     | ({32{inst_jirl}}                                                              & (rj_value + imm));
+endmodule