diff --git a/util/reggen/gen_dv.py b/util/reggen/gen_dv.py
index ac0e225..351f867 100644
--- a/util/reggen/gen_dv.py
+++ b/util/reggen/gen_dv.py
@@ -39,8 +39,7 @@
 
 # function get base addr in SV syntax
 def sv_base_addr(b):
-    sv_base_addr = b.base_addr.replace("0x", str(b.width) + "'h")
-    return sv_base_addr
+    return "{}'h{:x}".format(b.width, b.base_addr)
 
 
 # function generate dv ral model using raw dict object parsed from hjson
diff --git a/util/topgen.py b/util/topgen.py
index 26a3b91..aa9d55b 100755
--- a/util/topgen.py
+++ b/util/topgen.py
@@ -667,7 +667,7 @@
     for block in top_block.blocks:
         for module in top["module"]:
             if block.name == module["name"]:
-                block.base_addr = module["base_addr"]
+                block.base_addr = int(module["base_addr"], 0)
                 break
 
     top_block.blocks.sort(key=lambda block: block.base_addr)