中文说明：
为锁相回路或锁相环，用来统一整合时脉讯号，使内存能正确的存取资料。PLL用于振荡器中的反馈技术。 许多电子设备要正常工作，通常需要外部的输入信号与内部的振荡信号同步，利用锁相环路就可以实现这个目的。
English Description：
It is a phase-locked loop or a phase-locked loop, which is used to integrate the time pulse signal uniformly, so that the memory can access the data correctly. PLL is used in feedback technology of oscillator. In order to work normally, many electronic devices usually need the external input signal to synchronize with the internal oscillation signal, which can be achieved by using the phase-locked loop