【求助】自制xilinx下载线。cannot find cable，check cable setup

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  以下附console的全部日志内容
  
Welcome to iMPACT
iMPACT Version: 13.4
// *** BATCH CMD : setMode -bs
// *** BATCH CMD : setMode -bs
// *** BATCH CMD : setMode -bs
// *** BATCH CMD : setMode -bs
GUI --- Auto connect to cable...
// *** BATCH CMD : setCable -port auto
AutoDetecting cable. Please wait.
PROGRESS_START - Starting Operation.
Connecting to cable (U*** Port - USB21).
Checking cable driver.
Driver file xu***dfwu.sys found.
Driver version: src=1027, dest=1027.
Driver windrvr6.sys version = 10.2.1.0. WinDriver v10.21 Jungo (c) 1997 - 2010 Build Date: Aug 31 2010 x86_64 64bit SYS 14:14:44, version = 1021.
Cable PID = 0008.
Max current requested during enumeration is 74 mA.
Type = 0x0004.
Cable Type = 3, Revision = 0.
Setting cable speed to 6 MHz.
write cmdbuffer failed 20000015.
Error reading reference voltage level.
Cable connection failed.
Connecting to cable (Parallel Port - LPT1).
Checking cable driver.
Driver windrvr6.sys version = 10.2.1.0. WinDriver v10.21 Jungo (c) 1997 - 2010 Build Date: Aug 31 2010 x86_64 64bit SYS 14:14:44, version = 1021.
Cable connection failed.
Connecting to cable (Parallel Port - LPT2).
Checking cable driver.
Driver windrvr6.sys version = 10.2.1.0. WinDriver v10.21 Jungo (c) 1997 - 2010 Build Date: Aug 31 2010 x86_64 64bit SYS 14:14:44, version = 1021.
Cable connection failed.
Connecting to cable (Parallel Port - LPT3).
Checking cable driver.
Driver windrvr6.sys version = 10.2.1.0. WinDriver v10.21 Jungo (c) 1997 - 2010 Build Date: Aug 31 2010 x86_64 64bit SYS 14:14:44, version = 1021.
Cable connection failed.
Connecting to cable (Parallel Port - LPT4).
Checking cable driver.
Driver windrvr6.sys version = 10.2.1.0. WinDriver v10.21 Jungo (c) 1997 - 2010 Build Date: Aug 31 2010 x86_64 64bit SYS 14:14:44, version = 1021.
Cable connection failed.
PROGRESS_END - End Operation.
Elapsed time =     12 sec.
Cable autodetection failed.
WARNING:iMPACT:923 - Can not find cable, check cable setup !