第四章 組合邏輯電路

1、1第四章第四章 組合邏輯電路組合邏輯電路2344.1 4.1 組合邏輯電路的分析組合邏輯電路的分析5BABAABFBABAABBBAABA)()(BA678ABCCABCBABCAFCBAABC)(CBAABCCBAABC9CBAABCF。104.2 4.2 組合邏輯電路的設(shè)計(jì)組合邏輯電路的設(shè)計(jì)1112ABCCBACBACBAF)()(BCCBACBCBA)()(CBCBACBCBACBA131415ACBCBACF161171819)()()(24131324BBBBBBBBF20)()()(24131324BBBBBBBBF4B2B3B1B3B1B4B2B)()()(24131324BBB

2、BBBBB)()()()(24131324BBBBBBBB21DACCBACBBAF)()(DBACCABBDACACBBDACACBBDACACB22 niiniEEEEEF121 )(21uvxyabTTHEiiiiiEiH ab 21iiTTiE uvxy,iE23ACABCAABCAB)(iEACBCABCCBCABCBABCAB)(ABCABCBAABCAB)(2425niiEF126CBACBBAFCBACAB)(CBAACBABCACABCBABCACABCBABCACABCB274.3 4.3 典型組合邏輯電路的設(shè)計(jì)典型組合邏輯電路的設(shè)計(jì)4.3.1 4.3.1 基本運(yùn)算電路基本

3、運(yùn)算電路28291111iiiiiiiiiiiiiCBACBACBACBAS111)()(iiiiiiiiiCBACBACBA30111iiiiiiiiiCBCBACBAC11)(iiiiiCBCBA31325VGND5VGNDCiSiABCi-1213213456546109833343537S11B12A13S04A05B06C0-17GND8C39S310B311A312S213A214B215VCC1674LS283VCCA0A1A2A3B0B1B2B3S0S1S2S3CS11B12A13S04A05B06C0-17GND8C39S310B311A312S213A214B215VCC1

4、674LS283VCCA0A1A2A3B0B1B2B3S0S1S2S3S11B12A13S04A05B06C0-17GND8C39S310B311A312S213A214B215VCC1674LS283VCCA4A5A6A7B4B5B6B7S4S5S6S7C4041424344012301230123012301230123310SSSSSSSSSSSSSSSSSSSSSSSSCC231331231331231231233SSSSCSSSSSCSSSSSSSSSC4546471111iiiiiiiiiiiiiGBAGBAGBAGBAD111)()(iiiiiiiiiGBAGBAGBA48111

5、iiiiiiiiiGBGBAGBAG11)(iiiiiGBGBA4950515VGND5VGNDZFABCXX=0，加法X=1，減法524.3.2 4.3.2 代碼轉(zhuǎn)換電路代碼轉(zhuǎn)換電路5354CBDBDCBX55DCCDY56DZ 57CBDBDCBXDCCDYDZ 585960613434343BBBBBBG622323232BBBBBBG631212121BBBBBBG64654.3.3 4.3.3 數(shù)值比較電路數(shù)值比較電路BAF 1ABBAF2BAF 366)(BAB)(BAA67686970717273744.3.4 4.3.4 編碼器編碼器75767701jijiIIII)(ji 7

6、65432107654321076543210765432102IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIY784746454342414076543210IIIIIIIIIIIIIIIIIIIIIIA76543210IIIIIIIIA 4765321076532104765321076532104)(IIIIIIIIIIIIIIIIIIIIIIIIIIIIIII765476542IIIIIIIIY763276321IIIIIIIIY753175310IIIIIIIIY79807I0123456IIIIIIIST81STSY70 IISYSTIIIIIIIIYS76543

7、2100SYSTSTIIIIIIIIYEX76543210) 1(0STST0EXYEXY0EXY828376564364210IIIIIIIIIISTY765435421IIIIIIIISTY76542IIIISTY8410AA87AA1514AA0123ZZZZ85864.3.5 4.3.5 譯碼器譯碼器8788010AAEZ 011AAEZ 012AEAZ 013AEAZ 8990919293010AAEZ 011AAEZ 012AEAZ 013AEAZ 94959601230AAAAEZ 01231AAAAEZ 01232AAAAEZ 01233AAAAEZ 01234AAAAEZ 0

8、1235AAAAEZ 01236AAAAEZ 01237AAAAEZ 01238AAAEAZ 01239AAAEAZ 9798991001011412148BBBBBBBa12124BBBBBb1214BBBBe124BBBc124241214BBBBBBBBBd2414128BBBBBBBf2424128BBBBBBBg1021031040120AAAZ 0121AAAZ 0122AAAZ 0123AAAZ 0124AAAZ 0125AAAZ 0126AAAZ 0127AAAZ 00mZ 11mZ 22mZ 33mZ 44mZ 55mZ 66mZ 77mZ 105CBABCACAF1CBAB

9、CF2BCAAF3ABCCBCBAF4CBABCACAF1CBABCABBCA)(6543mmmm6543mmmm1067317312mmmmmmF76543765433mmmmmmmmmmF742074204mmmmmmmmF654365431mmmmmmmmF10710874217421mmmmmmmmDi73217321mmmmmmmmGi1091101114.3.6 4.3.6 數(shù)據(jù)選擇器數(shù)據(jù)選擇器112301201101001DASADASADAASDAASY113114115116117118BCCACBAYABCCBABACBAY301201101001DAADAADAADAAY

10、1193210301201101001ABDDBABDADBADAADAADAADAAYABCCBABACBAYCD 011DCD 2CD 3120BCCACBAY121122ABDDCBABDACBAF1123DCABDBAABDCABDBAF2124ABDDCBABDACBAF1DCABDBAABDCABDBAF2CD 01DD 11DCD 21DD 31020D021DDD 22DCD 32125CD 01DD 11DCD 21DD 31020D021DDD 22DCD 321261274.4 4.4 組合邏輯電路的險(xiǎn)象組合邏輯電路的險(xiǎn)象4.4.1 4.4.1 競爭競爭(Race)(Race) 1284.4.2 4.4.2 冒險(xiǎn)冒險(xiǎn)( (險(xiǎn)象險(xiǎn)象) )1291304.4.3 4.4.3 險(xiǎn)象的分類險(xiǎn)象的分類1311324.4.4 4.4.4 怎樣判定有無險(xiǎn)象怎樣判定有無險(xiǎn)象AAAAACAABF1AAFAAF133134CAABF1354.4.5 4.4.5 險(xiǎn)象的消除或減弱險(xiǎn)象的消除或減弱BCCAABF136137138I0I1I2I