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AM335X启动问题

Other Parts Discussed in Thread: AM3358

我的产品中使用AM3358方案,使用TPS65217C供电,启动顺序使用mmc0,SPI。实际测量发现启动时mmc0_clk信号的波形如下图所示,就是脉冲信号都拉不到底,检查上电时序什么的都正常,板子没有留出JTAG口。不知道大家有没遇到过同样的情况,请大神指点。