运行代码如下：
INFO:iMPACT - Digilent Plugin: Plugin Version: 2.4.4
INFO:iMPACT - Digilent Plugin: no JTAG device was found.
AutoDetecting cable. Please wait.
*** WARNING ***: When port is set to auto detect mode, cable speed is set to default 6 MHz regardless of explicit arguments supplied for setting the baud rates
PROGRESS_START - Starting Operation.
Connecting to cable (Usb Port - USB21).
Checking cable driver.
Driver file xusb_xlp.sys found.
Driver version: src=1029, dest=1029.
Driver windrvr6.sys version = 11.7.0.0. WinDriver v11.7.0 Jungo Connectivity (c) 1997 - 2014 Build Date: Oct 26 2014 X86 32bit SYS 09:05:06, version = 1170.
Invalid device driver license.
Cable connection failed.
Connecting to cable (Parallel Port - LPT1).
Checking cable driver.
Driver windrvr6.sys version = 11.7.0.0. WinDriver v11.7.0 Jungo Connectivity (c) 1997 - 2014 Build Date: Oct 26 2014 X86 32bit SYS 09:05:06, version = 1170.
Cable connection failed.
Connecting to cable (Parallel Port - LPT2).
Checking cable driver.
Driver windrvr6.sys version = 11.7.0.0. WinDriver v11.7.0 Jungo Connectivity (c) 1997 - 2014 Build Date: Oct 26 2014 X86 32bit SYS 09:05:06, version = 1170.
Cable connection failed.
Connecting to cable (Parallel Port - LPT3).
Checking cable driver.
Driver windrvr6.sys version = 11.7.0.0. WinDriver v11.7.0 Jungo Connectivity (c) 1997 - 2014 Build Date: Oct 26 2014 X86 32bit SYS 09:05:06, version = 1170.
Cable connection failed.
Connecting to cable (Parallel Port - LPT4).
Checking cable driver.
Driver windrvr6.sys version = 11.7.0.0. WinDriver v11.7.0 Jungo Connectivity (c) 1997 - 2014 Build Date: Oct 26 2014 X86 32bit SYS 09:05:06, version = 1170.
Cable connection failed.
PROGRESS_END - End Operation.
Elapsed time =     31 sec.
Cable autodetection failed.
WARNING:iMPACT:923 - Can not find cable, check cable setup !Enumerating cables. Please wait.


下载器上的绿灯是绿着的。
我不太理解为啥会说Invalid device driver license.有人跟我说是ISE版本问题，我重装了还这样。
另外我不插任何设备时执行 initialize chain 也是这个提示
试过重装xilink驱动，重装windriver，重装ISE 14.7 都是老样子。