數(shù)電加法計(jì)數(shù)器 無(wú)效態(tài)000 110

1、精選文檔目錄1課程設(shè)計(jì)的目的與作用···············································&

2、#183;·························1 1.1設(shè)計(jì)目的及設(shè)計(jì)要求······················

3、;·················································1 1.2

4、設(shè)計(jì)作用·················································&#

5、183;···································12設(shè)計(jì)任務(wù)·············&#

6、183;·················································&#

7、183;·························13 三位二進(jìn)制加法計(jì)數(shù)器的設(shè)計(jì)·····················

8、3;··········································1 3.1設(shè)計(jì)原理······&

9、#183;·················································&

10、#183;····························1 3.2設(shè)計(jì)過(guò)程···················

11、3;·················································

12、3;···············240110串行序列檢測(cè)器的設(shè)計(jì)································

13、···································4 4.1設(shè)計(jì)原理·············

14、83;·················································

15、83;·····················4 4.2設(shè)計(jì)過(guò)程···························

16、··················································

17、········55. 12及10進(jìn)制可控計(jì)數(shù)器的設(shè)計(jì)·······································

18、;························7 5.1設(shè)計(jì)原理························&#

19、183;·················································&#

20、183;··········7 5.2設(shè)計(jì)過(guò)程······································

21、;···············································76.仿真結(jié)果分析·&#

22、183;·················································&#

23、183;································8 6.1三位二進(jìn)制加法計(jì)數(shù)器仿真··············

24、83;················································8 6.2 011

25、0串航序列檢測(cè)器仿真················································&#

26、183;···············12 6.3 12及10進(jìn)制可控計(jì)數(shù)器仿真·······························

27、;······························147.設(shè)計(jì)總結(jié)··················

28、83;·················································

29、83;···················158.參考文獻(xiàn)·····························&

30、#183;·················································&

31、#183;········15.1設(shè)計(jì)目的與作用.1.1設(shè)計(jì)目的及設(shè)計(jì)要求根據(jù)設(shè)計(jì)要求設(shè)計(jì)三位二進(jìn)制加法計(jì)數(shù)器，串行序列檢測(cè)器及12和10進(jìn)制可控計(jì)數(shù)器，加強(qiáng)對(duì)數(shù)字電子技術(shù)的了解，鞏固課堂上學(xué)到的知識(shí)，了解計(jì)數(shù)器，串行序列檢測(cè)器的工作原理。.1.2設(shè)計(jì)作用通過(guò)電路箱及multisim仿真軟件的使用，可以使我們對(duì)計(jì)數(shù)器及串行檢測(cè)器有更深的理解，并且學(xué)會(huì)分析仿真結(jié)果，與理論結(jié)果作比較。加強(qiáng)了自我動(dòng)手動(dòng)腦的能力。.2設(shè)計(jì)任務(wù)1.三位二進(jìn)制加法計(jì)數(shù)器（無(wú)效態(tài)：000，110）2.串行序列檢測(cè)器（檢測(cè)序列：0110）3.12

32、及10進(jìn)制可控計(jì)數(shù)器的設(shè)計(jì)及仿真.3 三位二進(jìn)制加法計(jì)數(shù)器的設(shè)計(jì).3.1設(shè)計(jì)原理設(shè)計(jì)一個(gè)三位二進(jìn)制同步加法計(jì)數(shù)器，要求無(wú)效狀態(tài)為000,110001 010 011 100 101 111圖3.1.1 狀態(tài)圖 排列.3.2設(shè)計(jì)過(guò)程1 選擇觸發(fā)器，求時(shí)鐘方程、輸出方程和狀態(tài)方程 a選擇觸發(fā)器 由于JK觸發(fā)器的功能齊全，使用靈活，在這里選用3個(gè)CP下降沿觸發(fā)的邊沿JK觸發(fā)器。 b求時(shí)鐘方程 采用同步方案，故取CP是整個(gè)要設(shè)計(jì)的時(shí)序電路的輸入時(shí)鐘脈沖。 c求狀態(tài)方程 由3.1所示狀態(tài)圖可直接畫出電路次態(tài)卡諾圖。再分解開便可以得到如圖各觸發(fā)器的卡諾圖 Q1nQ0nQ2n 00 01 11 10xxx0

33、10100011101111001xxx 圖3.2.1次態(tài)卡諾圖Q1nQ0nQ2n 00 01 11 10x010110x 圖3.2.2 的卡諾圖 Q1nQ0nQ2n 00 01 11 10x101010x圖3.2.3 的卡諾圖Q1nQ0nQ2n 00 01 11 10x001111x圖3.2.4 的卡諾圖狀態(tài)方程（2）求驅(qū)動(dòng)方程JK觸發(fā)器的特性方程為（3）畫邏輯電路圖根據(jù)所選用的觸發(fā)器和時(shí)鐘方程，輸出方程，驅(qū)動(dòng)方程，便可以畫出如圖所示的邏輯電路圖。圖3.2.5 三位二進(jìn)制同步加法計(jì)數(shù)器邏輯電路（4）檢查電路能否自啟動(dòng)，可見(jiàn)在CP操作下都能回到有效狀態(tài)，電路能夠自啟動(dòng)。.4 0110串行序列檢

34、測(cè)器的設(shè)計(jì).4.1設(shè)計(jì)原理設(shè)計(jì)一個(gè)串行序列信號(hào)檢測(cè)器，檢查輸入信號(hào)中是否有“0110”序列信號(hào)。 設(shè)計(jì)步驟如下。1 邏輯抽象，畫出電路狀態(tài)轉(zhuǎn)換圖a輸入變量用X表示，X=0表示位數(shù)據(jù)為0，X=1表示位數(shù)據(jù)為1。輸出變量用Z表示，Z=1表示檢測(cè)到0110序列信號(hào)，Z=0表示未檢測(cè)到。b電路狀態(tài)量為4個(gè)，電路狀態(tài)編號(hào)分別用表示 各電路狀態(tài)的含義：初始狀態(tài)，電路還未收到一個(gè)有效的0：收到一個(gè)0或連續(xù)收到0后狀態(tài)：連續(xù)收到01后的狀態(tài)：連續(xù)收到011后的狀態(tài)c.列出電路狀態(tài)轉(zhuǎn)換圖如圖所示。圖中圓圈表示電路的各個(gè)狀態(tài)，箭頭表示在一個(gè)脈沖作用下，電路轉(zhuǎn)換方向和結(jié)果；斜線上方和下方的數(shù)字表示轉(zhuǎn)換前輸入，輸出變

35、量的值.0/0S0S1S2S31/00/00/11/01/00/01/0圖4.1.1電路狀態(tài)轉(zhuǎn)換圖從圖中知，檢測(cè)器的輸出不僅取決于輸入變量，而且還取決于電路的當(dāng)前狀態(tài)。.4.2設(shè)計(jì)過(guò)程(1) a.確定觸發(fā)器的數(shù)目 電路狀態(tài)數(shù)量M=4，代入，計(jì)算得n=2，電路需要兩個(gè)觸發(fā)器。b.電路狀態(tài)編碼電路狀態(tài)用兩個(gè)觸發(fā)器的狀態(tài)組合來(lái)表示，取的編碼為00,01,11,10。(2)選定觸發(fā)器，求出電路狀態(tài)方程、輸出方程和驅(qū)動(dòng)方程a 確定觸發(fā)器類型，JK觸發(fā)器。b 邏輯函數(shù)化簡(jiǎn)，寫出狀態(tài)方程，輸出方程，驅(qū)動(dòng)方程。選用卡諾圖化簡(jiǎn)的方法?？傻么螒B(tài)變量，和輸出變量Z的卡諾圖， Q1nQ0nQ2 00 01 11 1001/001/001/001/100/011/010/000/0 圖4.2.1 ，和輸出變量Z的卡諾圖 n Q1nQ0nQ2 00 01 11 1000 0 0 0 1 1 0 0 圖4.2.2 Q1nQ0nQ2n 00 01 11 1011 1 1 0 1 0 0 圖4.2.3 Q1nQ0nQ2n 00 01 11 1000010000 圖4.2.4 Z在卡諾圖中，用X，表示現(xiàn)態(tài)變量，并作為輸入變量，進(jìn)行化簡(jiǎn)后，得到電路狀態(tài)方程電路輸出方程 將式中的兩個(gè)邏輯式與JK觸發(fā)器特性方程進(jìn)行比較，得到兩個(gè)觸發(fā)器的驅(qū)動(dòng)方程2 畫出邏輯電路圖 根據(jù)驅(qū)動(dòng)方程，畫出0110序列信號(hào)檢測(cè)器邏輯圖，如圖所示