Hi,您好
关于sprr438a这个参考设计中的SYS_MCU_PWRDN信号作用是什么

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SYS_MCU_PWRDN的作用是System Power Down ('0' - normal operation, '1' - system power down)
请看下面的EVM user guide.
Table 4-3. J7200 SoC - GPIO Mapping Table
https://www.ti.com/lit/ug/spruiw7a/spruiw7a.pdf