DCM生成出现故障

最初，我设置了一个基于xc700a的项目，并在EVM板上完成了实验。
然后我将目标设备更改为xc200a，ISE在执行映射时发生错误，似乎DCM上出现故障。
我删除了DCM .xaw和生成的所有文件，并使用IP核生成器生成了新的DCM。
但是新生成的DCM（其名称与原始名称不同）不包含.vhd文件，单击“查看HDL源”或“查看HDL实例模板”时窗口中只出现空白。
我曾多次尝试，没有任何效果。
请帮我解释一下。
非常感谢。



以下为原文

At the beginning, I setup a project based on xc700a, and finish experiment on EVM board.
Then I change the target device to xc200a, error occur when ISE doing the map, it seems that failure on DCM. I deleted the DCM .xaw and all files generated, and generated a new DCM instead, also using the IP core generator. But the DCM newly generated (its name is different with original one) didn't include .vhd file, and only blank appeared in the windows when click "View HDL Source" or "View HDL Instantiation Template". I had tried many times, nothing worked.
Please help me to explain. Thanks a lot.