题解 | #编写乘法器求解算法表达式#

`timescale 1ns/1ns

module calculation(
	input clk,
	input rst_n,
	input [3:0] a,
	input [3:0] b,
	output [8:0] c
	);
	reg[8:0]c;
	wire [8:0]out1,out2;
wire [3:0]t1=4'b1100;
wire [3:0]t2=4'b0101;
  cheng cheng_uut1(
	.in1(t1),
	.clk(clk),
	.rst_n(rst_n),
	.in2(a),
	.out(out1)
  );

 cheng cheng_uut2(
	.in1(t2),
	.clk(clk),
	.rst_n(rst_n),
	.in2(b),
	.out(out2)
  );
always@(posedge clk or negedge rst_n) 
    if(!rst_n)
	c<=0;
	else c<=out1+out2;  

endmodule

module cheng(
	input clk,
	input rst_n,
	input [3:0] in1,
	input [3:0] in2,
	output [8:0] out
);
genvar i;
reg [8:0]buff[3:0];
generate for(i=0;i<4;i=i+1) begin :loop
 always@(posedge clk or negedge rst_n) 
    if(!rst_n)
	 buff[i]<=0;
	 else 
     buff[i]<=in2[i]?(in1<<i):0;
end
endgenerate
assign out=buff[0]+buff[1]+buff[2]+buff[3];
endmodule