[Modified] Switch soc_top&board to axi&xc7a200t

lacpu/rtl/mycpu/mmu.v

@@ -0,0 +1,21 @@
+module mmu (
+    input  [31:0] addr_i,
+    output [31:0] addr_o,
+    output        cache_v
+);
+    wire [1:0] addr_head_i, addr_head_o;
+    assign addr_head_i = addr_i[31:30];
+
+    wire kseg0_l, kseg0_h, kseg1_l, kseg1_h;
+    assign kseg0_l = addr_head_i == 2'b00;
+    assign kseg0_h = addr_head_i == 2'b01;
+    assign kseg1_l = addr_head_i == 2'b10;
+    assign kseg1_h = addr_head_i == 2'b11;
+    
+    wire other_seg;
+    assign other_seg = ~kseg0_l & ~kseg0_h & ~kseg1_l & ~kseg1_h;
+    assign addr_head_o = {2{kseg0_l}}&2'b00 | {2{kseg0_h}}&2'b01 | {2{kseg1_l}}&2'b10 | {2{kseg1_h}}&2'b11 | {2{other_seg}}&addr_head_i;
+    assign addr_o = {addr_head_o, addr_i[29:0]};
+
+    assign cache_v = ~(kseg0_l|kseg1_l|kseg1_h);
+endmodule