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DDC264EVM: 烧录程序出现Error Writing/Reading configuration register。

Part Number: DDC264EVM
Other Parts Discussed in Thread: DDC264

我将《DDC264 Verilog Firmware》里的源代码(未修改)烧录进了DDC264EVM板子里的FLASH,也提示烧录成功。  但是点开DDC264 Evalution,Refresh All显示Error Writing/Reading configuration register,无法Fast Data。   usb的灯是亮着的,未烧录程序之前Refresh All正常,一切工作正常,请问这是什么原因以及如何解决?(驱动有正常识别到,USB线缆也连着EVM)   我用的软件是ISE14.7。