交通燈設(shè)計(jì)實(shí)驗(yàn)報(bào)告

PAGEPAGE5EDA實(shí)驗(yàn)報(bào)告書(shū)姓名牛勇清學(xué)號(hào)200807211149實(shí)驗(yàn)時(shí)間2011.05.06課題名稱實(shí)驗(yàn)十十字路口交通管理器設(shè)計(jì)實(shí)驗(yàn)?zāi)康?.掌握EDA的層次化設(shè)計(jì)方法；2.了解用VHDL語(yǔ)言設(shè)計(jì)的思想；3.了解整個(gè)數(shù)字系統(tǒng)的設(shè)計(jì)方法；4.培養(yǎng)學(xué)生綜合應(yīng)用數(shù)字電路中所學(xué)到的理論知識(shí)去獨(dú)立完成設(shè)計(jì)課題的能力；5.通過(guò)查閱手冊(cè)和文獻(xiàn)資料，培養(yǎng)學(xué)生獨(dú)立分析和解決實(shí)際問(wèn)題的能力；設(shè)計(jì)要求設(shè)計(jì)一個(gè)十字路口交通管理器，該管理器控制十字路口甲、乙兩條道路的紅黃綠三色燈，指揮車(chē)輛和行人安全通過(guò)，交通管理器示意圖如圖所示，圖中R1、Y1、G1是甲道紅、黃、綠燈；R2、Y2、G2是乙道紅、黃、綠燈。該交通管理器由控制器和受其控制的3個(gè)定時(shí)器以及六個(gè)交通燈組成，圖中3個(gè)定時(shí)器分別確定甲道和乙道通行時(shí)間t1、t3以及公共的停車(chē)（黃燈亮）時(shí)間t2。這三個(gè)定時(shí)器采用以秒信號(hào)為時(shí)鐘的計(jì)數(shù)器來(lái)實(shí)現(xiàn)，C1、C2、C3分別是這些定時(shí)器的工作使能信號(hào)，即當(dāng)C1、C2或C3為1時(shí)，相應(yīng)的定時(shí)器開(kāi)始計(jì)數(shù)，W1、W2和W3為定時(shí)計(jì)數(shù)器的指示信號(hào)，計(jì)數(shù)器在計(jì)數(shù)過(guò)程中，相應(yīng)的指示信號(hào)為0，計(jì)數(shù)結(jié)束時(shí)為1。設(shè)計(jì)思路1編寫(xiě)記時(shí)程序，30秒的和5秒的2.理清6個(gè)燈的相關(guān)狀態(tài)即G1Y1R1G2Y2R2。1000010100010011000010103.編寫(xiě)控制部分程序，實(shí)現(xiàn)記時(shí)部分和狀態(tài)轉(zhuǎn)換部分的結(jié)合設(shè)計(jì)原理圖及源程序45秒計(jì)數(shù)器程序：libraryieee;useieee.std_logic_1164.all;useieee.std_logic_unsigned.all;useieee.std_logic_arith.all;entityc1isport(clk,c:instd_logic;w1:outstd_logic);endentityc1;architecturebhvofc1issignala:std_logic_vector(5downto0):="101100";beginprocess(clk,a,c)beginifclk'eventandclk='1'thenifc='1'thenifa>="000000"thena<=a-1;w1<='0';elsea<="101100";w1<='1';endif;endif;endif;endprocess;endbhv;5秒計(jì)數(shù)器程序libraryieee;useieee.std_logic_1164.all;useieee.std_logic_arith.all;useieee.std_logic_unsigned.all;entityj2isport(c2:instd_logic;clk:instd_logic;w2:outstd_logic);endj2;architecturesystemofj2issignala:std_logic_vector(2downto0):="101";beginprocess(clk,a)beginifclk'eventandclk='1'thenifc2='1'thenifa>"000"thena<=a-1;w2<='0';elsea<="101";w2<='1';endif;endif;endif;endprocess; endsystem; 控制電路程序libraryieee;useieee.std_logic_1164.all;useieee.std_logic_unsigned.all;useieee.std_logic_arith.all;entitytrafficisport(w1,w2,w3,clk:instd_logic;c3,c2,c1:outstd_logic;q:outstd_logic_vector(5downto0));endentitytraffic;architecturebhvoftrafficistypestatesis(s0,s1,s2,s3);signalcurrent_state:states:=s0;signalnext_state:states:=s0;beginp3:process(clk)beginifclk'eventandclk='1'thencurrent_state<=next_state;endif;endprocessp3;p2:process(current_state)begincasecurrent_stateiswhens0=>q<="100001";c3<='1';c2<='0';c1<='0';ifw3='1'thennext_state<=s1;elsenext_state<=s0;endif;whens1=>q<="010001";c3<='0';c2<='1';c1<='0';ifw2='1'thennext_state<=s2;elsenext_state<=s1;endif;whens2=>q<="001100";c3<='0';c2<='0';c1<='1';ifw1='1'thennext_state<=s3;elsenext_state<=s2;endif;whens3=>q<="001010";c3<='0';c2<='1';c1<='0';ifw2='1'thennext_state<=s0;elsenext_state<=s3;endif;endcase;endprocessp2;endbhv;仿真波形圖實(shí)驗(yàn)結(jié)果問(wèn)