【应用笔记】在Stratix和Stratix GX器件中实现时钟切换(Implementing Clock Switchover in Stratix & Stratix GX Devices) 时钟切换功能允许PLL在两个参考输入时钟之间进行切换。 The clock switchover feature allows the PLL to switch between two reference input clocks. Designers can use this feature for clock redundancy or for a dual clock domain application such as in a system where the system can turn on the redundant clock if the primary clock stops running. The clock switchover circuitry can perform clock switchover automatically, when the clock is no longer toggling, or based on a user control signal. Implementing Clock Switchover in Stratix & Stratix GX Devices January 2004, 1.0 Application Note Introduction The clock switchover feature allows the PLL to switch between two reference input clocks. Designers can use this feature for clock redundancy or for a dual clock domain application such as in a system where the system can turn on the redundant clock if the primary clock stops running. The clock switchover circuitry can perform clock switchover automatically, when the ……