littice fpga能扫描到jtag口,但是下载不了咋回事
failed in Function erase(see log file for more datils)
logfile的内容是

System Information:
-----------------------------------------------------
Microsoft(R) Windows(R) XP(TM) Service Pack 2
Intel(R) Pentium(R) Dual  CPU  E2180  @ 2.00GHz

USB V2.0 detected.
08/17/10 14:53:28  
Check configuration setup: Start.
08/17/10 14:53:29  
  JTAG Chain Verification. No Errors.
08/17/10 14:53:29  
Check configuration setup: Successful.
08/17/10 14:53:29  
Device1 LFE3-35EA: Fast Program
HDR  0
TDR  0
SDR 32   TDI(FFFFFFFF)
Expected  TDO(FFFFFFFF)
Received  TDO(00000000)
Bits Error 0032: Expected: 1 Received: 0
Bits Error 0031: Expected: 1 Received: 0
Bits Error 0030: Expected: 1 Received: 0
Bits Error 0029: Expected: 1 Received: 0
Bits Error 0028: Expected: 1 Received: 0
Bits Error 0027: Expected: 1 Received: 0
Bits Error 0026: Expected: 1 Received: 0
Bits Error 0025: Expected: 1 Received: 0
Bits Error 0024: Expected: 1 Received: 0
Bits Error 0023: Expected: 1 Received: 0
and more...
Execution time: 28.33 milliseconds
08/17/10 14:53:30  
Failed in Function ERASE
08/17/10 14:53:31  
  Process Operation Failed.
Elapsed time: 02 sec
08/17/10 14:53:31  
  Operation: Unsuccessful.
08/17/10 14:53:38  ispDOWNLOAD cable detected on USB Port.
However, the board power is not turned ON.