Release 14.2 Drc P.28xd (nt64)
Copyright (c) 1995-2012 Xilinx, Inc.  All rights reserved.

Thu Feb 12 12:13:09 2015

drc -z top.ncd top.pcf

Now executing Pdr_LogDcm_DeskewExtern::DoCheck for block<DCM_SP_1>. 
Now executing Pdr_LogDcm_DeskewExtern::DoCheck for block<DCM_SP_1> and
DESKEW(5). 
Now executing Pdr_LogDcm_DeskewExtern::DoCheck for block<DCM_SP_1> found no
EXTERN driver in CLKFB path. 
Now executing Pdr_LogDcm_DeskewExtern::DoCheck for block<DCM_SP_1> found
non-EXTERN block <BUFG> in CLKFB path. 
Now executing Pdr_LogDcm_DeskewExtern::DoCheck for block<DCM_SP_1> found NO
extern 
INFO:PhysDesignRules:1861 - To achieve optimal frequency synthesis performance
   with the CLKFX and CLKFX180 outputs of the DCM comp DCM_SP_1, consult the
   device Data Sheet.
DRC detected 0 errors and 0 warnings.