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用lm10010+tps56121给c6657的cvdd供电，将电源输出与DSP断开，即空载，电源输出正常，一接上dsp，电源输出振荡，是怎么回事？
可能是没有满足AVS时序有关，对照C6657手册section7.2.4 figure7-3确认一下时序。
另外这里推荐使用LM10011给C6657 cvdd初始1.1V电压，参考如下FAQ Misc point5
http://www.deyisupport.com/question_answer/dsp_arm/c6000_multicore/f/53/t/25103.aspx
