数字逻辑第四章2014

1、1第四章第四章 组合逻辑电路组合逻辑电路2344.1 4.1 组合逻辑电路的分析组合逻辑电路的分析5BABAABFBABAABBBAABA)()(BA678ABCCABCBABCAFCBAABC)(CBAABCCBAABC9CBAABCF。104.2 4.2 组合逻辑电路的设计组合逻辑电路的设计1112ABCCBACBACBAF)()(BCCBACBCBA)()(CBCBACBCBACBA131415ACBCBACF161171819)()()(24131324BBBBBBBBF20)()()(24131324BBBBBBBBF4B2B3B1B3B1B4B2B)()()(24131324BBB

2、BBBBB)()()()(24131324BBBBBBBB21DACCBACBBAF)()(DBACCABBDACACBBDACACBBDACACB22 niiniEEEEEF121 )(21uvxyabTTHEiiiiiEiH ab 21iiTTiE uvxy,iE23ACABCAABCAB)(iEACBCABCCBCABCBABCAB)(ABCABCBAABCAB)(2425niiEF126CBACBBAFCBACAB)(CBAACBABCACABCBABCACABCBABCACABCB274.3 4.3 典型组合逻辑电路的设计典型组合逻辑电路的设计4.3.1 4.3.1 基本运算电路基本

3、运算电路28291111iiiiiiiiiiiiiCBACBACBACBAS111)()(iiiiiiiiiCBACBACBA30111iiiiiiiiiCBCBACBAC11)(iiiiiCBCBA31323334353637383940012301230123012301230123310SSSSSSSSSSSSSSSSSSSSSSSSCC231331231331231231233SSSSCSSSSSCSSSSSSSSSC4142431111iiiiiiiiiiiiiGBAGBAGBAGBAD111)()(iiiiiiiiiGBAGBAGBA44111iiiiiiiiiGBGBAGBAG1

4、1)(iiiiiGBGBA45464.3.2 4.3.2 代码转换电路代码转换电路4748CBDBDCBX49DCCDY50DZ 515253543434343BBBBBBG552323232BBBBBBG561212121BBBBBBG57584.3.3 4.3.3 数值比较电路数值比较电路BAF 1ABBAF2BAF 359)(BAB)(BAA60616263646566674.3.4 4.3.4 编码器编码器68697001jijiIIII)(ji 765432107654321076543210765432102IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIY7147

5、46454342414076543210IIIIIIIIIIIIIIIIIIIIIIA76543210IIIIIIIIA4765321076532104765321076532104)(IIIIIIIIIIIIIIIIIIIIIIIIIIIIIII765476542IIIIIIIIY763276321IIIIIIIIY753175310IIIIIIIIY72737I0123456IIIIIIIST74STSY70 IISYSTIIIIIIIIYS765432100SYSTSTIIIIIIIIYEX76543210) 1(0STST0EXYEXY0EXY757676564364210IIIIII

6、IIIISTY765435421IIIIIIIISTY76542IIIISTY7710AA87AA1514AA0123ZZZZ78794.3.5 4.3.5 译码器译码器8081010AAEZ 011AAEZ 012AEAZ 013AEAZ 8283848586010AAEZ 011AAEZ 012AEAZ 013AEAZ 87888901230AAAAEZ 01231AAAAEZ 01232AAAAEZ 01233AAAAEZ 01234AAAAEZ 01235AAAAEZ 01236AAAAEZ 01237AAAAEZ 01238AAAEAZ 01239AAAEAZ 90919293941

7、412148BBBBBBBa12124BBBBBb1214BBBBe124BBBc124241214BBBBBBBBBd2414128BBBBBBBf2424128BBBBBBBg9596970120AAAZ 0121AAAZ 0122AAAZ 0123AAAZ 0124AAAZ 0125AAAZ 0126AAAZ 0127AAAZ 00mZ 11mZ 22mZ 33mZ 44mZ 55mZ 66mZ 77mZ 98CBABCACAF1CBABCF2BCAAF3ABCCBCBAF4CBABCACAF1CBABCABBCA)(6543mmmm6543mmmm997317312mmmmmmF765

8、43765433mmmmmmmmmmF742074204mmmmmmmmF654365431mmmmmmmmF10010174217421mmmmmmmmDi73217321mmmmmmmmGi1021031044.3.6 4.3.6 数据选择器数据选择器105301201101001DASADASADAASDAASY106107108109110111BCCACBAYABCCBABACBAY301201101001DAADAADAADAAY1123210301201101001ABDDBABDADBADAADAADAADAAYABCCBABACBAYCD 011DCD 2CD 3113BCCACBAY114115ABDDCBABDACBAF1116DCABDBAABDCABDBAF2117ABDDCBABDACBAF1DCABDBAABDCABDBAF2CD 01DD 11DCD 21DD 31020D021DDD 22DCD 32118CD 01DD 11DCD 21DD 31020D021DDD 22DCD 321191204.4 4.4 组合逻辑电路的险象组合逻辑电路的险象4.4.1 4.4.1 竞争竞争(Race)(Race) 1214.4.2 4.4.2 冒险冒险( (险象险