verilog 问题

个位大大打扰了 问个问题问题1：
module Mul
(
input clk,
input signed [7:0] da,
input signed [7:0] db,
output reg signed [15:0] dout_mul
);

// Declare input and output registers
reg signed [7:0] dataa_reg;
reg signed [7:0] datab_reg;
wire signed [15:0] mult_out;

// Store the result of the multiply
assign mult_out = dataa_reg * datab_reg;

// Update data
always @ (posedge clk)
begin
dataa_reg <= da;
datab_reg <= db;
dout_mul <= mult_out;
end

endmodule
Golaced 8:36:44
中assign mult_out = dataa_reg * datab_reg;
是什么意思啊  是两个数据 合并在一起吗？


问题2：
module add(bin,ain,out);
output signed [7:0] out;
input signed  [7:0]bin,ain;
assign out=ain/2+bin/2;
endmodule
   

assign out=ain/2+bin/2;这个除2是除0000010的意思吗？


第三个问题：

module Filter2(input signed [15:0] din,
input clk,
output signed [31:0] y,
output reg signed out        );
parameter FN = 32;

reg signed [15:0] shift [0:FN];
reg signed [32:0] sum;

always @(posedge clk)
begin
integer i;


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