Mon Feb 28 17:14:59 2011: Loaded macro file: C:Program FilesIAR SystemsEmbedded Workbench 5.4armconfigflashloaderTexasInstrumentsFlashLM3Sxxx.mac Mon Feb 28 17:14:59 2011: DLL version: V4.12 Mon Feb 28 17:14:59 2011: Firmware: J-Link ARM V8 compiled Dec 1 2009 11:42:48 Mon Feb 28 17:14:59 2011: JTAG speed is initially set to: 32 kHz Mon Feb 28 17:14:59 2011: Could not measure total IR len. TDO is constant high. Mon Feb 28 17:14:59 2011: Could not measure total IR len. TDO is constant high. Mon Feb 28 17:15:00 2011: Could not measure total IR len. TDO is constant high.  Mon Feb 28 17:15:00 2011: Resetting target using RESET pin Mon Feb 28 17:15:06 2011: Halting CPU core Mon Feb 28 17:15:11 2011: Fatal error: Could not find supported CPU core on JTAG chain Bad JTAG communication: Write to IR: Expected 0x1, got 0x7 (TAP Command : 2) @ Off 0x5. Session aborted! Mon Feb 28 17:15:11 2011: Failed to load flash loader: C:Program FilesIAR SystemsEmbedded Workbench 5.4armconfigflashloaderTexasInstrumentsFlashLM3SxxxRAM16K.out Mon Feb 28 17:15:11 2011: Failed to load flash loader: C:Program FilesIAR SystemsEmbedded Workbench 5.4armconfigflashloaderTexasInstrumentsFlashLM3Sx3xx.flash   芯片用的是LM3s6432 ,试了好几个板子，都是无法用J-link下载的情况（在该工程下其他板子可以正常下载）。。   硬件上电压都是正确的，但是TRST脚位电压不正常只有2V。。原理图和芯片脚位、连接情况都确认了，没有问题，   应该不是所谓的锁死问题，请教高手，有没有遇到过相似的问题。。。。万分感谢！！！   此帖出自小平头技术问答