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请教coregenerator的问题[求助]

请教coregenerator的问题[求助]

在ise里,我用core generator生成一个rom,综合报错如下:

WARNING:HDLParsers:3481 - No primary, secondary unit in the file F:\MY_PROJECTS\top/rom.vhd. Ignore this file from project file rom_vhdl.prj.
FATAL_ERROR:Xstortability/export/Port_Main.h:127:1.13 - This application has discovered an exceptional condition from which it cannot recover. Process will terminate. To resolve this error, please consult the Answers Database and other online resources at http://support.xilinx.com. If you need further assistance, please open a Webcase by clicking on the "WebCase" link at http://support.xilinx.com
ERROR: XST failed
Process "Synthesize" did not complete.

这个是什么意思,请各位指教
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