Use 13 bit CSR address width (INSERT_CSR_ADAPTOR=1 in ip_arria10_mac_10g.qsys).

libraries/technology/mac_10g/tech_mac_10g_pkg.vhd

@@ -52,7 +52,7 @@ PACKAGE BODY tech_mac_10g_pkg IS
   BEGIN
     CASE c_technology IS
       WHEN c_tech_stratixiv => v_csr_addr_w := 13;
-      WHEN c_tech_arria10   => v_csr_addr_w := 10;
+      WHEN c_tech_arria10   => v_csr_addr_w := 13;  -- 13 with INSERT_CSR_ADAPTOR=1 in ip_arria10_mac_10g.qsys, 10 without
       WHEN OTHERS           => v_csr_addr_w := 13;  -- default to c_tech_stratixiv
     END CASE;
     RETURN v_csr_addr_w;