一段Verilog HDL程序，求解释

lj4259

module bin2dec(data,dec1,dec0,clk);
input[7:0] data;
input clk;
output[7:0] dec1;
output[7:0] dec0;
reg[7:0] dec1;
reg[7:0] dec0;
reg[7:0] led_data;
reg[6:0] c;
wire[6:0] valid_data;
integer i;
assign valid_data=data[6:0];
[email=always@(posedge]always@(posedge[/email] clk)
begin
c=valid_data;
led_data=8'b0;
for(i=0;i4'b0100) led_data[7:4]=led_data[7:4]+3;
end
?led_data