04第四章清華5版

1、組合邏輯組合邏輯 電路電路1a2ana1y2ymy組合邏輯電路的框圖組合邏輯電路的框圖)(afy ）aa(afy)aa(afy)aa(afynmmnn2121222111如果信號燈如果信號燈出現(xiàn)故障，出現(xiàn)故障，z為為1ragzragraggraagrgarzagrgragarz012345670123456701234567012345672iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiy753107632176542iiiiyiiiiyiiiiy45675676772iiiiiiiiiiy45672iiiiybabaa低電平)()()(siiiiiiiiiiysiiiiii

2、iiysiiiiy6421643567054234567145672)(45672iiiiy選通信號)(siiiiy45672)()()(siiiiiiiissiiiiiiiiysiiiiiiiiyexs012345670123456701234567為0時，電路工作無編碼輸入為0時，電路工作有編碼輸入76543210iiiiiiiis012yyyexsyyexsyy15a0exy815aa19ii9i0iexy70127201221012100120maaaymaaaymaaaymaaay.用二極管與門陣列組成的3線8線譯碼器低電平輸出附加控制端123ssss )(iimsy 32ss 01

3、234567yyyyyyyyiimz d3=1d3=0)(90imyiiimyabccbbcazcabbazcbabczcabbcaacz4321),(),(),(),(742053273165434321mabccbbcazmcabbazmcbabczmcabbcaacz)(),()(),()(),()(),(74204532373126543174205327316543mmmmmzmmmmzmmmmzmmmmmz)()()()()()()(0121230112023012012012012012230120121302130123aaaaaayaaaaaaayaaayaaaaaaaaay

4、aaaaayaaaaaaaayaaaaaaaaygfedcbalt當 時，ya yg全部置為10ltrbi當 時， 時，則滅燈0rbi00000123aaaarbobi0bi00123aaaa0rbirbo0rborbirborborbirborbi)()()()(01301201101011aadaadaadaadsy1s70126012501240123012201210120012daaadaaadaaadaaadaaadaaadaaadaaay)()()()()()()()(位地址輸入端作為第利用3s)()()()(0130120110101aadaadaadaady)()()()(a

5、gagrgargarragraggraagrgarz1)()()()(01301201101011aadaadaadaadsyabcobas)()(ciacibbacoabciciabcibacibasiiiiiiiiiiiicibabacocibascoci)()()()()(1)()()()()()()()()()()()(:)()()()()()()()(:)()()()(:0000011112222220000011112222222222000001111120000011110111110000011011101000000000002100cibababababacibascib

6、abababababacibabacocibabababacociicibabababacobabacocibababacobascociicibabacocibascii00110123 dcbayyyy？d2d1d0)()()()(),(,),(,),(baybababaybababaabyabbababababa10110101或同為則則)()()()()()()()()()()()()()()()(bababababayyybabababaybabababababababababaybbbbaaaa001122330011223311223322333301230123和比較為附加端，用于擴展和)()()(,bababaiii輸出允許信號來自低位的比較結果來自低位的比較結果baiiiba