具体错误如下： JTAG接口是TMS TCK TD0 TD1 直连，曾经下载过进去一次程序，以后再也不能下载
GUI --- Auto connect to cable...
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 = 10.4.0.0. WinDriver v10.40 Jungo (c) 1997 - 2011 Build Date: Oct 17 2011 x86_64 64bit SYS 12:29:28, version = 1040.
Cable PID = 0008.
Max current requested during enumeration is 74 mA.
Type = 0x0004.
Cable Type = 3, Revision = 0.
Setting cable speed to 6 MHz.
Cable connection established.
Firmware version = 1303.
File version of F:/xilinx/14.7/ISE_DS/ISE/data/xusb_xlp.hex = 1303.
Firmware hex file version = 1303.
PLD file version = 0012h.
PLD version = 0012h.
PROGRESS_END - End Operation.
Elapsed time = 1 sec.
Type = 0x0004.
ESN device is not available for this cable.
Attempting to identify devices in the boundary-scan chain configuration...
INFO:iMPACT - Current time: 2017/6/26 16:34:28
PROGRESS_START - Starting Operation.
Identifying chain contents...'0': : Manufacturer's ID = Xilinx xc6slx9, Version : 2
INFO:iMPACT:1777 -
Reading F:/xilinx/14.7/ISE_DS/ISE/spartan6/data/xc6slx9.bsd...
INFO:iMPACT:501 - '1': Added Device xc6slx9 successfully.
----------------------------------------------------------------------
----------------------------------------------------------------------
done.
PROGRESS_END - End Operation.
Elapsed time = 0 sec.
'1': Loading file 'E:/sp6ex2/sp6ex2/sp6ex2_V2/sp6ex2/sp6.bit' ...
done.
INFO:iMPACT:2257 - Startup Clock has been changed to 'JtagClk' in the bitstream stored in memory,
but the original bitstream file remains unchanged.
UserID read from the bitstream file = 0xFFFFFFFF.
Data width read from the bitstream file = 1.
INFO:iMPACT:501 - '1': Added Device xc6slx9 successfully.
----------------------------------------------------------------------
----------------------------------------------------------------------
INFO:iMPACT - Current time: 2017/6/26 16:34:45
PROGRESS_START - Starting Operation.
Maximum TCK operating frequency for this device chain: 25000000.
Validating chain...
Boundary-scan chain validated successfully.
'1': Programming device...
LCK_cycle = NoWait.
LCK cycle: NoWait
done.
'1': Reading status register contents...
[0] CRC ERROR : 0
[1] IDCODE ERROR : 0
[2] DCM LOCK STATUS : 0
[3] GTS_CFG_B STATUS : 0
[4] GWE STATUS : 0
[5] GHIGH STATUS : 0
[6] DECRYPTION ERROR : 0
[7] DECRYPTOR ENABLE : 0
[8] HSWAPEN PIN : 0
[9] MODE PIN M[0] : 0
[10] MODE PIN M[1] : 0
[11] RESERVED : 0
[12] INIT_B PIN : 0
[13] DONE PIN : 0
[14] SUSPEND STATUS : 0
[15] FALLBACK STATUS : 0
INFO:iMPACT:2219 - Status register values:
INFO:iMPACT - 0000 0000 0000 0000
INFO:iMPACT:579 - '1': Completed downloading bit file to device.
INFO:iMPACT:188 - '1': Programming completed successfully.
LCK_cycle = NoWait.
LCK cycle: NoWait
INFO:iMPACT - '1': Checking done pin....done.
'1': Programming terminated. DONE did not go high.
PROGRESS_END - End Operation.
Elapsed time = 1 sec.
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