8-3线优先编码器74 LS148的级联分析及研究

摘要

74LS148是一种带扩展功能的8-3线优先编码器，将多片74LS148集成8-3线优先编码器级联构成不同的编码器，能够灵活、有效地扩大编码器的使用范围。不同的74LS148进行级联时，任何时候只对其中优先级别最高的输入信号进行编码，编码器的工作状态由使能输入端决定。%The 74 ls148 is an 8-3 line priority encoder with extension function.It can make the more 74 ls148 8-3 line priority encoders to cascade different encoders.It can flexibly and effectively enlarge the using range of the encoder.At any time,different 74 ls148 cascade,only to encode one of the highest priority level input sig-nal,the working state of the encoder is decided by enabling input.