Generate E-R diagram for existing Oracle SQL Script

Hi,
We have some existed Packages,Procedures,Functions,Views and Materialized Views. We are planning to generate E-R diagrams for existed codes. Could you please suggest me how can we do the same.
we are using Oracle SQL Developer and Oracle Version is : 11g.
Thanks.
Jai V

Hi,
I have already posted a thread regarding Data Flow diagram for existing source code. But I couldn't find find where exactly I have posted. So here I am posting my observations. I would like to prepare a Data Flow diagram for existing Source code. Using Visustin V7 I got the Data Flow Diagram. But am not able to export or Save or Print the diagram. As some one suggested it is possible to get the DFD using Visio. But am not able to get the DFD. Here am getting the problem like , Gave user name and Server name by connecting to ODBC. But still am not getting the required DFD.
Can you please suggest me is there any way to get the DFD using Visio or any tool is there to get the DFD.
Please advice.
Thanks.

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