diff --git a/cocotbext/axi/utils.py b/cocotbext/axi/utils.py
index 1983e17..c510cad 100644
--- a/cocotbext/axi/utils.py
+++ b/cocotbext/axi/utils.py
@@ -23,28 +23,28 @@ THE SOFTWARE.
 """
 
 
-def hexdump_line(data, offset):
+def hexdump_line(data, offset, row_size=16):
     h = ""
     c = ""
-    for ch in data[0:16]:
+    for ch in data[0:row_size]:
         h += f"{ch:02x} "
         c += chr(ch) if 32 < ch < 127 else "."
-    return f"{offset:08x}: {h:48} {c}"
+    return f"{offset:08x}: {h:{row_size*3}} {c}"
 
 
-def hexdump(data, start=0, length=None, prefix="", offset=0):
+def hexdump(data, start=0, length=None, row_size=16, prefix="", offset=0):
     stop = min(start+length, len(data)) if length else len(data)
-    for k in range(start, stop, 16):
-        print(prefix+hexdump_line(data[k:min(k+16, stop)], k+offset))
+    for k in range(start, stop, row_size):
+        print(prefix+hexdump_line(data[k:min(k+row_size, stop)], k+offset, row_size))
 
 
-def hexdump_lines(data, start=0, length=None, prefix="", offset=0):
+def hexdump_lines(data, start=0, length=None, row_size=16, prefix="", offset=0):
     lines = []
     stop = min(start+length, len(data)) if length else len(data)
-    for k in range(start, stop, 16):
-        lines.append(prefix+hexdump_line(data[k:min(k+16, stop)], k+offset))
+    for k in range(start, stop, row_size):
+        lines.append(prefix+hexdump_line(data[k:min(k+row_size, stop)], k+offset, row_size))
     return lines
 
 
-def hexdump_str(data, start=0, length=None, prefix="", offset=0):
-    return "\n".join(hexdump_lines(data, start, length, prefix, offset))
+def hexdump_str(data, start=0, length=None, row_size=16, prefix="", offset=0):
+    return "\n".join(hexdump_lines(data, start, length, row_size, prefix, offset))