Are you using the latest ISE service pack?  I don't know if any issues
but Generates are newish and there has been a lot of improvements in
recent versions of the tools.  

If it still persists, then file a webcase online with Xilinx:
http://www.xilinx.com/support/clearexpress/websupport.htm

Paul

Ramakrishnan wrote:
> 
> Hi, I was trying to implement my design in Xilinx ISE using Xst as the Synthesis tool. It gave me a error INTERNAL_ERROR:Xst:cmain.c:3020:1.146 - To resolve this error, please consult the Answers Database and other online resources at <http://support.xilinx.com>. To give you a basic idea, my program is IF Generate Structures and my guess is this is causing the Xst to crash. I am unable to find any information about this particular error.
> 
> Thanks,
> 
> Ramakrishnan.

Hi, I was trying to implement my design in Xilinx ISE using Xst as the Synthesis tool. It gave me a error INTERNAL_ERROR:Xst:cmain.c:3020:1.146 - To resolve this error, please consult the Answers Database and other online resources at <http://support.xilinx.com>. To give you a basic idea, my program is IF Generate Structures and my guess is this is causing the Xst to crash. I am unable to find any information about this particular error.

Thanks,

Ramakrishnan.