TI中文支持网您好！我现在用JTAG的仿真器连接UCD3138的板子，但是连接的过程中会报错。我在UCD3138 Digital Power Supply Controller Technical Reference Manual这个手册里面看到 9.4 I/O Mux Control
In different package versions of UCD3138, different I/O functions are multiplexed and routed toward a
single physical pin. Consult the UCD3138 device datasheet for specific information related to each
version.
I/O Mux Control register may be used in order to choose a specific functionality that is desired to be
assigned to a physical device pin.
Please note that the default value of IOMUX does not configure the TDO pin as a JTAG pin. Hence,
IOMUX configuration must be changed in order to implement JTAG communication to UCD3138.
这样一段话。意思是不是必须用USB-TO-GPIO把IOMUX寄存器修改了之后，才能用JTAG进行调试？谢谢。
Johnsin Tao：
Hi是的，用JTAG时需要另外配置。
user5228780：
回复 Johnsin Tao:
那是用PMBUS修改IOMUX寄存器吗？谢谢。
user5228780：
回复 Johnsin Tao:
您好，请问是不是用USB-TO-GPIO连接电脑修改寄存器配置呢？谢谢。
