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28335芯片故障

Other Parts Discussed in Thread: TMS320F28335

芯片TMS320F28335,仿真器XDS100V2,编译软件CCS5.2。程序固化到flash中,DSP与控制电路通过光耦隔离,在使用过程 中,DSP口突然不出波形了,再用仿真器从新下程序时已无法下载,提示进入了low power mode,在ram中仿真器与DSP可以连接。C28xx: Flash Programmer: Error erasing flash memory. Device is locked or not connected.C28xx: Flash Programmer: Device is locked or not connected. Operation cancelled.从提示中可以看出flash被锁死,请问这种情况确定时芯片坏了吗,如果可以修复,我该怎么操作,望给出详细步骤,我已连续损坏两块 28335开发板,但我用其他单片机STM32在同样电路中使用时没有任何问题,很稳定。谢谢