xilinx ise下载出现以下问题

PROGRESS_START - Starting Operation.
INFO:iMPACT:583 - ‘1‘: The idcode read from the device does not match the idcode in the bsdl File.
INFO:iMPACT:1578 - ‘1‘:  Device IDCODE :        00001111111111111111111111111111
INFO:iMPACT:1579 - ‘1‘: Expected IDCODE:    00000010101011010110000010010011
PROGRESS_END - End Operation.
Elapsed time =      0 sec.

解决办法：

1、硬件问题，这种可能性很小。

2、右击右边空白区域，选择initialize chain，一般都是由此问题引起的。