题解 | #流水线乘法器#

`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		
);


	reg	[size*2-1:0]	temp	[0:size-1];

integer	i;
always@(posedge	clk	or	negedge rst_n)
	if(!rst_n)	begin
		for(i=0;i<size;i=i+1)
		temp[i]<=0;
		end		
	else	begin
		for(i=0;i<size;i=i+1)
		temp[i]	<=	mul_b[i]?	(mul_a <<i):0;
	end

always@(posedge	clk or negedge	rst_n)
	if(!rst_n)
		mul_out	<=	0;
	else
		mul_out	<=	temp[0] + temp[1] + temp[2] + temp[3] ;

endmodule