本设计实例描述了一个非易失性门控功能的简单替代方案,通常实现门控功能要使用PAL(可编程逻辑阵列)、GAL(门阵列逻辑)或CPLD(复杂可编程逻辑器件)。要实现阻挡或放行一个逻辑信号的门控功能,通常会采用一个逻辑门,如AND门,用它的第二个输入端确定是否阻 This design example describes a simple alternative to the non-volatile gating feature that typically uses PAL (programmable logic array), GAL (gate array logic), or CPLD (complex programmable logic device) for gating functions. To implement a gate function that blocks or releases a logic signal, a logic gate, such as an AND gate, is typically used, with its second input determining whether to block