verilog HDLBits刷题“Popcount255”---Combination for-loop:255-bit population count

一、题目A population count circuit counts the number of 1s in an input vector. Build a population count circuit for a 255-bit input vector.Module Declarationmodule top_module( input [254:0] in, output [7:0] out );二、分析题目要求计算电路输入向量 中1的个数使用for语句结合if语句判断输入的每一位是否为1是则结果加一否则结果保持不变。三、代码实现module top_module( input [254:0] in, output reg [7:0] out ); integer i; always(*)begin out7d0; for(i0;i255;ii1)begin if(in[i]1)begin outout7d1; end else outout; end end endmodule 或者 module top_module( input [254:0] in, output [7:0] out ); reg [7:0]count; always (*)begin count8d0; for(int i0;i254;i)begin if (in[i]1) countcount8d1; else countcount; end end assign outcount; endmodule四、时序