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AM4379 上电时序

Other Parts Discussed in Thread: AM4379

你好,目前使用AM4379,没有外接DDR和RTC,电源使用两片LTM4644,发现启动不起来,JTAG连接不了,然后把芯片的冷复位PORZ接口引出来一根线,手动复位,发现没有复位时电流0.876,复位之后就变成0.712,松开复位仍然为0.712,之后怎么复位电流也不产生变化了,我怀疑芯片死机了,只有重现上电,才能恢复电流0.876.上电时序也按照手册做了呀,不知道为什么。