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1、数字系统设计与硬件描述语言期末考试作业题目：数字式竞赛抢答器设计学院：电子信息工程学院专业：电子信息工程学号：3009204150姓名：蒋溯南2012-06-12一、选题设计描述1.基本要求：至少可容纳3组参赛者同时抢答，具有抢答成功、提前抢答等警示，具有计分功能，打对计分，打错不计分或者扣分。2.本设计基本性能介绍：可同时容纳4位抢答者，完全满足题设要求。3.算法简介：分三模块进行编程：计分模块，抢答确认及警告模块，计时模块二、程序源代码及说明1.抢答确认模块：libraryieee;useieee.std_logic_1164.all;useie
2、ee.std_logic_unsigned.all;entitystayisport(clk,en,rst:instd_logic;warn:outstd_logic;--提前抢答警告back:bufferstd_logic;--反馈k1,k2,k3,k4:instd_logic;table:outstd_logic_vector(3downto0));--台号endstay;architectureoneofstayissignalfoul:std_logic;--警告signalcnt:std_logic_vector(2downto0);--计
3、数beginp1:process(k1,rst,k2,k3,k4,back)--抢答确认beginifrst='1'thenback<='1';table<="0000";elsifback='1'thenifk1='1'thentable<="0001";back<='0';elsifk2='1'thentable<="0010";back<='0';elsifk3='1'thentable<="0011";back<='0';elsifk4='1'thentable<="0100";back<='0';elseback<='1';table<="
4、0000";endif;endif;endprocessp1;p3:process(clk,en,back,rst,cnt)--提前抢答警告beginifrst='1'thencnt<="000";foul<='0';elsifclk'eventandclk='1'thenifen='0'andback='0'thenifcnt<"111"thenfoul<=notfoul;cnt<=cnt+1;--计数警告取反elsefoul<='0';endif;endif;endif;endprocessp3;warn<=foul;endone;1.计分模块：
5、libraryieee;useieee.std_logic_1164.all;useieee.std_logic_unsigned.all;entitymarkisport(clk,up,dn:instd_logic;--加减分数table:instd_logic_vector(3downto0);--台号a1,a2,a3,a4:bufferstd_logic_vector(3downto0));--得分endmark;architectureoneofmarkisbeginprocess(clk,table,a1,a2,a3,a4,up,dn)--
6、加减分数beginifclk'eventandclk='1'theniftable="0001"thenifup='1'thenifa1="1111"thena1<="0000";elsea1<=a1+1;endif;elsifdn='1'thenifa1="0000"thena1<="0000";elsea1<=a1-1;endif;endif;elsiftable="0010"thenifup='1'thenifa1="1111"thena2<="0000";elsea2<=a2+1;endif;elsifdn='1'thenifa2="0000
7、"thena2<="0000";elsea2<=a2-1;endif;endif;elsiftable="0011"thenifup='1'thenifa3="1111"thena3<="0000";elsea3<=a3+1;endif;elsifdn='1'thenifa3="0000"thena3<="0000";elsea3<=a3-1;endif;endif;elsiftable="0100"thenifup='1'thenifa4="1111"thena4<="0000";elsea4<=a4+1;endif;elsifdn='1'then
8、ifa4="0000"thena4<="0000";elsea4<=a4-1;endif;endif;end
