开发项目用到DSP，现在面临DSP远距离烧写的问题（机箱内，机箱外）。想把DSP的J-TAG口通过DB9的连接线引出，但是使用研旭的100V3仿真器的时候还是出现了连接不上的问题，报错如下：
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)
大家有遇到过相同的情况吗？都是怎么解决的呢？
看很多人用串口来烧写，但是，用串口的时候，硬件电路是不是要修改呢？在机箱里面这个要怎么改？大家一般怎么做呢？ |
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时候，早期版本的仿真器就是不能用的，
