The TAP controller is a synchronous finite state machine that responds to changes at the TMS and TCK signals of the TAP and controls the sequence of operations of the circuitry. TAP controller state diagram *黄*色*状态可以重复,其他状态只能出现一次,下个TCK上升沿会切换到下一个状态. S
For most embedded CPU architecture implementations, the JTAG port is used by the debugger to interface the chip for debugging one or more cores. The normal user will probably not need to know details of the JTAG implementation unless there is a need
现象 CPU: STM32107VC 用JLINK 烧写程序时出现NO Cortex-m device found in JTAG chain 如图无法查找到硬件就是CPU 提示1:NO Cortex-M device found inJTAG chain.please check the JTAG cable and the connected devices 提示2:error:flash download failed-target DLL has been cancelled 原
Debug and trace functions are integrated into the ARM Cortex-M4. Serial wire debug and trace functions are supported in addition to a standard JTAG debug and parallel trace functions. The ARM Cortex-M4 is configured to support up to eight breakpoints
2013-12-04 22:34:26 转自:http://processors.wiki.ti.com/index.php/Debugging_JTAG_Connectivity_Problems Contents [hide] 1 Strategy for debugging JTAG connectivity problems2 Check your hardware JTAG connection 1.1 If using Spectrum Digital emulators 1.2 I