简单无符号乘法器（怎么总是有疏漏，神啊！必须要level up了！）

module multiplier(
input clk,rst,
input [7:0] A,B,
output [16:0] C);

reg [3:0] cnt;
reg [16:0] temp;
always@(posedge clk or negedge rst)
if(!rst)
begin
cnt<=0;
temp<=0;
end
else if(cnt==8)
cnt<=0;
else if(B[cnt])
begin
temp<=temp+(A<<cnt);
cnt<=cnt+1;
end
else
cnt<=cnt+1;

assign C=(cnt==8)?temp:0;

endmodule 

 1 `timescale 1ns/1ns
 2 module multiplier_tb;
 3 reg [7:0] A,B;
 4 reg clk,rst;
 5 wire [16:0] C;
 6 
 7 multiplier U(
 8 .A(A),
 9 .B(B),
10 .clk(clk),
11 .rst(rst),
12 .C(C)
13 );
14 
15 initial
16 begin
17 rst=0;
18 clk=0;
19 A=8‘hfc;
20 B=8‘hcf;
21 #5 rst=1;
22 end
23 always
24 #10 clk=~clk;
25 
26 endmodule