题解 | #流水线乘法器#

//temp 一定给out的位宽 也就是俩倍
//打一拍输出
`timescale 1ns/1ns

module multi_pipe#(
	parameter size = 4
)(
	input 						clk 		,   
	input 						rst_n		,
	input	[size-1:0]			mul_a		,
	input	[size-1:0]			mul_b		,
 
 	output	reg	[size*2-1:0]	mul_out		
);
    wire [size*2-1:0]temp0;
	wire [size*2-1:0]temp1;
	wire [size*2-1:0]temp2;
	wire [size*2-1:0]temp3;
	reg [size*2-1:0]temp;
	assign temp0=mul_b[0]?{4'b0,mul_a}:0;
	assign temp1=mul_b[1]?{3'b0,mul_a,1'b0}:0;
	assign temp2=mul_b[2]?{2'b0,mul_a,2'b0}:0;
	assign temp3=mul_b[3]?{1'b0,mul_a,3'b0}:0;
	always@(posedge clk or negedge rst_n)begin
	if(!rst_n)
	mul_out<=0;
	else
	mul_out<=temp;end
		
	always@(posedge clk or negedge rst_n)begin
	if(!rst_n)
	temp<=0;
	else
	temp<=temp0+temp1+temp2+temp3;end



endmodule