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TMS320F28335上电偶发程序不启动

使用了一款TI的DSP,型号为TMS320F28335,电源芯片为TPS767D301,在调试过程中,有两块板子上的DSP会出现上电偶发不能启动的现象。在DSP不能正常启动的情况下,电源芯片的复位管脚正常,有200ms的复位,不能启动时手动复位,DSP能够正常工作。这种情况可能存在的原因是什么?