diff --git a/tools/oneclick/prestudy/YAML/peripheral.py b/tools/oneclick/prestudy/YAML/peripheral.py
index d3690dc7713337edfdbf91f95b5485a43b798738..9a358fb93b78f31330610cdaa07a4b75c1c46350 100644
--- a/tools/oneclick/prestudy/YAML/peripheral.py
+++ b/tools/oneclick/prestudy/YAML/peripheral.py
@@ -1,6 +1,6 @@
 ###############################################################################
 #
-# Copyright (C) 2012
+# Copyright (C) 2016
 # ASTRON (Netherlands Institute for Radio Astronomy) <http://www.astron.nl/>
 # P.O.Box 2, 7990 AA Dwingeloo, The Netherlands
 #
@@ -17,14 +17,19 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
+# Author  Date
+#   HJ    jan 2017  Original
+#   EK    feb 2017  
+#
 ###############################################################################
 
 
 ###############################################################################
 
+import os
 import copy
 import yaml
-from common import *
+import common as cm
 
 field_modes = ["RO", "WO", "RW", "WP", "RR"]
 
@@ -47,14 +52,14 @@ class Register:
         self.name     = name        
         self.fields   = fields
         self.nof_inst = nof_inst
-        self.depth    = self.nof_inst*2**ceil_log2(len(fields))
+        self.depth    = self.nof_inst * cm.ceil_pow2(len(fields))
         
     def addField(self, name, width, mode, offset, default, descr): 
         self.fields.append(Field(name, width, mode, offset, default, descr))
-        self.depth = self.nof_inst*2**ceil_log2(len(fields))
+        self.depth = self.nof_inst * cm.ceil_pow2(len(fields))
     
     def setDepth(self):
-        self.depth = self.nof_inst*2**ceil_log2(len(self.fields))
+        self.depth = self.nof_inst * cm.ceil_pow2(len(self.fields))
     
     def setNof_inst(self, nof_inst):
         self.nof_inst = nof_inst
@@ -119,9 +124,12 @@ class Peripheral:
             exec("%s = %d" % (parameter, self.parameters[parameter])) # Here the parameters of the peripheral are promoted to real python variables 
         for ram in self.rams:
             ram.name  = ram.name + self.postfix
-            ram.depth = self.nof_inst * 2 ** ceil_log2(eval(str(ram.depth))) # Here the variables are used to evaluate the true value for the depth parameter(taking int account the nof_inst as well)
+            print ram.depth
+            ram.depth = self.nof_inst * cm.ceil_pow2(eval(str(ram.depth))) # Here the variables are used to evaluate the true value for the depth parameter(taking int account the nof_inst as well)
+            print ram.depth
             print ram.width
             ram.width = eval(str(ram.width)) # Here the variables are used to evaluate the true value for the width parameter.
+            print ram.width
             print "  " + ram.name + " " + "depth: " + str(ram.depth)
             print "  " + ram.name + " " + "width: " + str(ram.width)
 
@@ -163,7 +171,7 @@ class PeripheralLibrary:
         """Store the dictionaries from all fileName files in rootDir."""
         self.rootDir = rootDir
         self.fileName = fileName                                   # all peripheral files have the same fileName
-        self.filePaths = find_all_file_paths(rootDir, fileName)    # list of all directory paths of peripheral files that are available in the rootDir tree
+        self.filePaths = cm.find_all_file_paths(rootDir, fileName) # list of all directory paths of peripheral files that are available in the rootDir tree
         if len(self.filePaths)==0:
             sys.exit('Error : No %s file found in %s directory tree.' % (fileName, rootDir))
         self.filePathNames = []                                    # list of all directory paths + fileName of the available peripheral files