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28027空芯片上电后XRS脚一直输出低电平?

Other Parts Discussed in Thread: CONTROLSUITE

这是我的原理图:1)没有安装JTAG接口,打算只用SCI下载;2)没有用晶振,打算从FPGA送一个10MHz时钟进23脚;... ...

但上电后用万用表量XRS脚一直输出低电平,查过VDD脚(32、43)是3.3V,VSS脚(33、44)是0V,VREGENZ脚(34)也是0V,...

查过焊接没问题,芯片也换过了。

请教一下各位前辈:还会是什么问题呢?