优先编码器扩展的设计方法

Design Method for Expanding Priority Encoder

以 2片 3位优先编码器 (T4 14 8)扩展为 4位为例 ,依据组合电路的传统设计方法 ,通过严密的逻辑推导 ,充分利用约束条件 ,应用逻辑简化的各种手段 ,来实现优先编码器的功能扩展 ,同时给出了 4片 3位优先编码器扩展为 5位优先编码器的设计方法。

Taking the expanding of two three-bit priority encoders into one four-bit priority encoder for example and based on the traditional designing method of combinational logic circuit, the expanding functions of priority encoder are realized through the rigorous logical derivation, full use of constraint conditions and various means of logical simplification. Meanwhile, the designing methods to expand four three-bit prio- rity encoders into one five-bit priority encoder are put forward.