题解 | #移位运算与乘法#
移位运算与乘法
https://www.nowcoder.com/practice/1dd22852bcac42ce8f781737f84a3272
完整一点的可用使用状态机，不过这个题目状态比较简单，也可以不用状态机。
注意区分不同时刻做不同的计算。
`timescale 1ns/1ns module multi_sel( input [7:0]d , input clk, input rst, output reg input_grant, output reg [10:0]out ); //*************code***********// reg [1:0] out_num; reg [7:0] din; always @(posedge clk or negedge rst) begin if(~rst) out_num <= 'd0; else if(out_num == 'd3) out_num <= 'd0; else out_num <= out_num + 'd1; end always @(posedge clk or negedge rst) begin if(~rst) input_grant <= 1'b0; else if(out_num == 'd0) input_grant <= 1'b1; else input_grant <= 1'b0; end always @(posedge clk or negedge rst) begin if(~rst) din <= 'd0; else if(out_num == 'd0) din <= d; end always @(posedge clk or negedge rst) begin if(~rst) out <= 'd0; else begin case(out_num) 'd0: out <= d; 'd1: out <= (din << 1) + din; 'd2: out <= (din << 3) - din; 'd3: out <= (din << 3); default: out <= 'd0; endcase end end //*************code***********// endmodule
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