TI中文支持网自己设计的板子，芯片是TMS320F2812，一共100块板子，大概有50块连不上上CCS6.1，仿真器用XDS100V3，提示如下错误：
Error connecting to the target:
(Error -516 @ 0x0)
The user selected specific frequency failed the scan-path reliability test.
The utility or debugger requested the JTAG controller and cable,
that generate the JTAG clock, to provide a user selected fixed
frequency. The built-in scan-path reliability test has failed.
This indicates that the JTAG controller and its cable cannot
reliably communicate with the target system at that frequency.
(Emulation package 6.0.222.0)
测试电源3.3V和1.8V都没有问题，复位信号，晶振也都ok。
将复位信号按下时尝试连接，错误与上面一样。
JTAG部分PCB设计如下：
mangui zhang：根据个人经验这个应该不是硬件问题连不上的通过插拔USB端口重启电脑
重启软件是否有可能会连上我觉得还是仿真器与CCS板边仿真器与目标器件CCS版本与目标器件之间的支持性等造成的
自己设计的板子，芯片是TMS320F2812，一共100块板子，大概有50块连不上上CCS6.1，仿真器用XDS100V3，提示如下错误：
Error connecting to the target:
(Error -516 @ 0x0)
The user selected specific frequency failed the scan-path reliability test.
The utility or debugger requested the JTAG controller and cable,
that generate the JTAG clock, to provide a user selected fixed
frequency. The built-in scan-path reliability test has failed.
This indicates that the JTAG controller and its cable cannot
reliably communicate with the target system at that frequency.
(Emulation package 6.0.222.0)
测试电源3.3V和1.8V都没有问题，复位信号，晶振也都ok。
将复位信号按下时尝试连接，错误与上面一样。
JTAG部分PCB设计如下：
user4398176：
回复 mangui zhang:
有的连不上的多试几次能连上，有的这次连上的，下次可能有连不上了。稳定性很差。
自己设计的板子，芯片是TMS320F2812，一共100块板子，大概有50块连不上上CCS6.1，仿真器用XDS100V3，提示如下错误：
Error connecting to the target:
(Error -516 @ 0x0)
The user selected specific frequency failed the scan-path reliability test.
The utility or debugger requested the JTAG controller and cable,
that generate the JTAG clock, to provide a user selected fixed
frequency. The built-in scan-path reliability test has failed.
This indicates that the JTAG controller and its cable cannot
reliably communicate with the target system at that frequency.
(Emulation package 6.0.222.0)
测试电源3.3V和1.8V都没有问题，复位信号，晶振也都ok。
将复位信号按下时尝试连接，错误与上面一样。
JTAG部分PCB设计如下：
user4398176：
回复 HH Y:
Y2是晶振，这个虽然不一样长，但在容许的误差范围内。我这边也遇到仿真器死机的问题。这些板子在现场一个都连不上，在办公司还好一些，所以怀疑是抗干扰能力不行，但是不知道怎么确认是不是这个问题。
