排队电路设计（EDA）
内容及要求
单窗口排队机电路，给每个新来者编号，并计算队伍长度。 （2）初始时队长0，进队号码由1顺序递增，输出编号；
（3）有人入队，长度加，有人离队长度减；
（4）工作时钟适当即可；
（5）完成全部流程：设计规范文档、模块设计、代码输入、功能仿真、约束与综合、布局布线、时序仿真、下载验证等。代码如下：
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
entity count is
port(rst,clk:in std_logic;
selbit:out std_logic_vector(7 downto 0); --位选数码管
signal sel:std_logic_vector(2 downto 0);
jin,chu:in std_logic; --jin为进队信号，chu为出队信号
lednum:out std_logic_vector(6 downto 0)); ---输出显示
end count;
architecture behav of count is
signal num_ll,num_lh,num_hl,num_hh:std_logic_vector(3 downto 0); -----定义新来者编号
signal cus_ll,cus_lh,cus_hl,cus_hh:std_logic_vector(3 downto 0);
----定义当前服务号码
signal length_ll,length_lh,length_hl,length_hh:std_logic_vector(3 downto 0); ---定义队伍长度
signal tmpbcdnum:std_logic_vector(3 downto 0);
signal cnt4:integer range 0 to 10 ;
signal sel:std_logic_vector(2 downto 0);
signal cnt10:std_logic_vector(11 downto 0);
signal tmpclk:std_logic;
begin
p1:process(clk,rst,jin) （输入代码）
begin
I f rst='1' then
num_ll<="0000";num_lh<="0000";num_hl<="0000";num_hh<="0000"; ------复位信号则全部清零
elsif clk'event and clk='1' then ---时钟上升沿到来且有进队
if jin='1' then
num_ll<=num_ll+1;
if num_ll<"1001" then num_ll<=num_ll+1; 10
elsif num_lh<"1001" then num_lh<=num_lh+1;num_ll<="0000";
elsif num_hl<"1001" then num_hl<=num_hl+1;num_lh<="0000";
elsif num_hh<"1001" then num_hh<=num_hh+1;num_hl<="0000";
elsif (num_ll<="1001" and num_lh<="1001" and num_hl<="1001" and num_hh<="1001") then
num_ll<="0000";num_lh<="0000";num_hl<="0000";num_hh<="0000"; ----计数，从0000计到9999，再从0000循环；
end if;
end if;
end if;
end process p1;
p2:process(rst,clk,dout)
begin
if rst='1' then cus_ll<="0000";cus_lh<="0000";cus_hl<="0000";cus_hh<="0000";
elsif clk'event and clk='1' then
if chu='1' then
cus_ll<=cus_ll+1;
if cus_ll<"1001" then cus_ll<=cus_ll+1;
elsif cus_lh<"1001" then cus_lh<=cus_lh+1;cus_ll<="0000";
elsif cus_hl<"1001" then cus_hl<=cus_hl+1;cus_lh<="0000";
elsif cus_hh<"1001" then cus_hh<=cus_hh+1;cus_hl<="0000";
elsif (cus_ll<="1001" and cus_lh<="1001" and cus_hl<="1001" and cus_hh<="1001") then
cus_ll<="0000";cus_lh<="0000";cus_hl<="0000";cus_hh<="0000";
end if; ----当前服务号码的变化类似于新来者编号
end if;
end if;
end process p2;
p3:process(rst,tmpclk)
begin
if rst='1' then cnt4<=0;
elsif tmpclk'event and tmpclk='1' then
if cnt4<8 then cnt4<=cnt4+1;
else cnt4<=0;
end if; -----计数，为后边扫描信号做准备
end if;
end process p3;
free_counter:block
signal q:std_logic_vector(24 downto 0);
begin
p4:process(clk,rst)
begin
if rst='0' then q<=(OTHERS=>'0');
elsif clk'event and clk='1' then
q<=q+1;
end if;
end process p4;
selout<=sel;
sel<="000" when cnt4=0 else
"001" when cnt4=1 else
"010" when cnt4=2 else
"011" when cnt4=3 else
"100" when cnt4=4 else
"101" when cnt4=5 else
"110" when cnt4=6 else
"111" when cnt4=7 else
"000"; -----实现位选数码管
end block free_counter;
P5:process(rst,clk)
begin
if rst='0' then cnt10<=0;
elsif clk'event and clk='1' then
cnt10<=cnt10+1; ----cnt10用来计数实现时钟分频
else cnt10<=0;
end if; -----时钟分频
end if;
end process p5;
tmpclk<=cnt10(10);
p5:process(rst,clk,chu)
begin
if rst='1' then length_ll<="0000";length_lh<="0000";length_hl<="0000";length_hh<="0000";
elsif clk'event and clk='1' then
if chu<='1' then
length_ll<=num_ll-cus_ll; -----减法得到队长
length_lh<=num_lh-cus_lh; ---并将值附给相应位
length_hl<=num_hl-cus_hl;
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