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之前在论坛里我已经发过这个问题了
我采用板子晶振作为主时钟,公式、vco1的中心频率都满足进入freerun模式的要求,但是将led灯的状态调整成pll1 vco calibration active时并不亮,即便通过pll1powerdown手动调节,代表pll1 vco calibration active的led灯只闪烁一下;但是将apll2级联xo时,这个pll2 vco calibration active的灯就亮,而将apll2级联到apll1时,pll2 vco calibration active灯也不亮。
此外,我接入参考后,走dpll和apll1的级联,当led灯指示为默认时,能够满足dpll锁定的要求,将led灯再次调成指示pll1 vco calibration active以及pll1 lock detected(lol*)时都不亮,所以我现在十分怀疑是开发板的硬件哪里出了问题,我能否和技术人员加一下联系方式咨询一下?