最近有小部分XC3S400A-4FTG256C的控制板，在工作一段时间后不工作了！而且
1. JTAG下载失败
2. 去掉Flash, JTAG下载依然失败
3. 读取ID是OK的
大侠们帮忙看看是什么问题吧！
INFO:iMPACT - Current time: ???? ???? // *** BATCH CMD : Program -p 1
PROGRESS_START - Starting Operation.
Maximum TCK operating frequency for this device chain: 10000000.
Validating chain...
Boundary-scan chain validated successfully.
'1': Programming device...
LCK_cycle = NoWait.
LCK cycle: NoWait
done.
'1': Reading status register contents...
CRC error : 0
IDCODE not validated while writing FDRI : 0
DCM Locked : 0
status of GTS_CFG_B : 0
status of GWE : 0
status of GHIGH : 0
value of VSEL pin 0 : 0
value of VSEL pin 1 : 0
value of VSEL pin 2 : 0
value of MODE pin M0 : 0
value of MODE pin M1 : 0
value of MODE pin M2 : 0
value of CFG_RDY (INIT_B) : 0
DONEIN input from Done Pin : 0
SYNC word not found : 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.
INFO:iMPACT - Current time: ???? ???? // *** BATCH CMD : ReadIdcode -p 1
Maximum TCK operating frequency for this device chain: 10000000.
Validating chain...
Boundary-scan chain validated successfully.
'1': IDCODE is '00000010001000100000000010010011'
'1': IDCODE is '02220093' (in hex).
'1': : Manufacturer's ID = Xilinx xc3s400a, Version : 0
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