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CC2640R2F晶振无法起振

Other Parts Discussed in Thread: CC2640R2F

CC2640R2F用的是5*5mm封装,外接晶振有两个,32.768KHz和24MHz,外接电源为3.3V,经过内部DC-DC,VDDR为1.7V左右,现在问题就是两个晶振均无法起振,更换主芯片,晶振,谐振电容,甚至将评估板上正常起振的晶振换到自己设计的PCB上仍然无法起振,至此基本排除焊接和电源供电问题导致无法起振。难道是设计问题或者是未知的其他原因,求解,谢谢!