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请教,DP83640芯片上的JTAG口的作用

Other Parts Discussed in Thread: DP83640

如题,看到开发板上都没有使用DP83640芯片上的JTAG口。

这个口是保留给TI的还是集成用户的?具体是用来干嘛的?能举个例子就最好了。

找了很久没有找到相关资料。发帖求教各位专家。