NIOS II代码下载问题？

Using cable "USB-Blaster [USB-0]", device 1, instance 0x00
Pausing target processor: not responding.
Resetting and trying again: FAILED
Leaving target processor paused
这是什么问题?NIOS II 里的C代码下载不下去?

没出息，天天只会跟着别人NIOS II，有本事整个像龙芯的出来！