题解 | #位拆分与运算#
位拆分与运算
https://www.nowcoder.com/practice/1649582a755a4fabb9763d07e62a9752
`timescale 1ns/1ns module data_cal( input clk, input rst, input [15:0]d, input [1:0]sel, output reg [4:0]out, output reg validout ); //*************code***********// reg [15:0]data_lock; //寄存器data——lock放的时候要注意 always @(posedge clk or negedge rst) begin if(!rst) data_lock<=0; else if(!sel) data_lock<=d; end always@(posedge clk or negedge rst) begin if(!rst) begin out <= 'b0; validout <=0; end else begin case(sel) 0:begin out<='b0; validout <=0; end 1:begin out<=data_lock[3:0]+data_lock[7:4]; validout <=1; end 2:begin out<=data_lock[3:0]+data_lock[11:8]; validout <=1; end 3:begin out<=data_lock[3:0]+data_lock[15:12]; validout <=1; end endcase end end //*************code***********// endmodule