参考答案

正确答案：(1)4选1数据选择器。ENTITY mux41 ISPORT(ena0a1d₀d₁d₂d₃：IN Bit；F：OUT Bit)；END mux41；ARCHITECTURE bch_mux41 OF mux41 ISBEGINPROCESS(ena1a0d₃d₂d₁d₀)BEGINIF(en=‘1’)THENIF(al=‘0’AND a0=‘0’)THENf＜=d0；ELSIF(al=‘0’AND a0=‘1’)THENf＜=d1；ELSIF(a1=‘1’AND a0=‘0’)THENf＜=d2：ELSEf＜=d3；ENDIF；ELSEf＜=‘0’；ENDIF；END PROCESS；END bch_mux41；(2)2线一4线译码器。LIBRARY IEEE；USE IEEE．STD_LOGIC_1164．ALL；ENTITY b0-2-4 ISPORT(ena0a1：IN STD_LOGIC；YOY1Y2Y3：OUT STD_LOGICO)；END b0-2-4；ARCHITECTURE rtl OF b0-2-4 ISSIGNAL tmp_IN：STD_LOGIC_VECTOR(IDOWNTO 0)；SIGNAL tmp_OUT：STD_LOGIC_VECTOR(3DOWNTO 0)；BEGINtmp_IN＜=al&a0；PROCESS(tmp_INen)BEGINIF(en=‘0’)THENCASS tmp_IN ISWHEN“00”=＞tmp_OUT＜=“1110”；WHEN“01”=＞tmp_OUT＜=“1101”；WHEN“10”=＞tmp_OUT＜=“1011”；WHEN“11”=＞tmp_OUT＜=“0111”；WHEN OUTTHERS=＞tmp_OUT＜=“1111”；END CASS；ELSEtmp_OUT＜=“1111”；END IF；Y0＜=tmp_OUT(0)；Yl＜=tmp_OUT(1)；Y2＜=tmp_OUT(2)；Y4＜=tmp_OUT(3);END PROCESS：END rt1；(3)时钟R-S触发器。ENTITY R-S-FFPORT(rsCLK：IN Bit；qnq：BUFFER Bit)；END R-S-FF：ARCH工TECTURE rsff OF R-S-FFISBEGINASSERT NOT(r=‘1’AND s=‘1’REPORT“Control∣error“SEVERITV Error；PROCESS(rsCLK)BEGINIF CLK=‘1’THENq＜=S OR(NOT r AND q)；nq＜=NOT(S OR(NOT r AND q))；END IF；END PROCESS；END rsff；(4)带复位端Clear和置位端Preset、输出延迟T_pd为20ns响应CP下降沿的J-K触发器。LIBRARY IEEE；USE IEEE．STD_LOGIC_1164．ALL；ENTITY JKff ISPORT(clearpresetCLKJK：INSTD LOGIC：qNq：OUT STD_LOGIC)；END JKff；ARCHITECTURE rl OF JKff ISPROCESS(clearpresetCLKJK)BEGINIF(clear=‘0’)THENq＜=‘0’；Nq＜=‘1’；ELSIF(preset=‘0’)THENq＜=‘1’；Nq＜=‘0’：ELSIF(CLK’EVENT AND CLK=‘0’)THENIF(J=‘0’)AND(K=‘1’)THENq＜=‘0’ AFTER 20ns；Nq＜=‘1’AFTER 20ns：ELSIF(J=‘1’)AND(K=‘0’)T既Nq＜=‘1 ’AFTER 20ns；Nq＜=‘0’AFTER 20ns：ELSIF(J=‘1’)AND(K=‘1’)THENq＜=NOT q AFTER 20ns；Nq＜=NOT Nq AFTER 20ns：ENDIF；END PROCESS；END rtl；(5)主从J-K触发器。可根据主从J-K触发器特点自行编程。(6)集成计数器74163。ENTITY counterl6 ISPORT(cridcp．cttctp：IN Bit；d：IN Bit VECTOR(3DOWNTO 0)；q：BUFFER Bit_Vector(3DOWNTO 0)；co：OUT Bit)；END counter16；ARCHITECTURE behave_ctr16 OF counterl 6 ISBEGINPROCESS(cp)BEGINIF(cp=‘1’)THENIF cr=‘0’THENq＜=“0000”；ELSIF id=‘0’THENq＜=d；ELSIF(ctt=‘1’AND ctp=‘1’)THENIF q=“1111”THENq＜=“0000”；ELSEq＜=q+1；END IF；END IF；END IF；END PROCESS；c0＜=‘1’WHEN(q=“1111”AND ctt=‘l’)ELSE‘0’；END bch_ctr16；(7)集成移位寄存器74194。(请读者自行编写)。
4选1数据选择器。ENTITYmux41ISPORT(en,a0,a1,d0,d1,d2,d3：INBit；F：OUTBit)；ENDmux41；ARCHITECTUREbch_mux41OFmux41ISBEGINPROCESS(en,a1,a0,d3,d2,d1,d0)BEGINIF(en=‘1’)THENIF(al=‘0’ANDa0=‘0’)THENf＜=d0；ELSIF(al=‘0’ANDa0=‘1’)THENf＜=d1；ELSIF(a1=‘1’ANDa0=‘0’)THENf＜=d2：ELSEf＜=d3；ENDIF；ELSEf＜=‘0’；ENDIF；ENDPROCESS；ENDbch_mux41；(2)2线一4线译码器。LIBRARYIEEE；USEIEEE．STD_LOGIC_1164．ALL；ENTITYb0-2-4ISPORT(en,a0,a1：INSTD_LOGIC；YO,Y1,Y2,Y3：OUTSTD_LOGICO)；ENDb0-2-4；ARCHITECTURErtlOFb0-2-4ISSIGNALtmp_IN：STD_LOGIC_VECTOR(IDOWNTO0)；SIGNALtmp_OUT：STD_LOGIC_VECTOR(3DOWNTO0)；BEGINtmp_IN＜=al&a0；PROCESS(tmp_IN,en)BEGINIF(en=‘0’)THENCASStmp_INISWHEN“00”=＞tmp_OUT＜=“1110”；WHEN“01”=＞tmp_OUT＜=“1101”；WHEN“10”=＞tmp_OUT＜=“1011”；WHEN“11”=＞tmp_OUT＜=“0111”；WHENOUTTHERS=＞tmp_OUT＜=“1111”；ENDCASS；ELSEtmp_OUT＜=“1111”；ENDIF；Y0＜=tmp_OUT(0)；Yl＜=tmp_OUT(1)；Y2＜=tmp_OUT(2)；Y4＜=tmp_OUT(3);ENDPROCESS：ENDrt1；(3)时钟R-S触发器。ENTITYR-S-FFPORT(r,s,CLK：INBit；q,nq：BUFFERBit)；ENDR-S-FF：ARCH工TECTURErsffOFR-S-FFISBEGINASSERTNOT(r=‘1’ANDs=‘1’REPORT“Control∣error“SEVERITVError；PROCESS(r,s,CLK)BEGINIFCLK=‘1’THENq＜=SOR(NOTrANDq)；nq＜=NOT(SOR(NOTrANDq))；ENDIF；ENDPROCESS；ENDrsff；(4)带复位端Clear和置位端Preset、输出延迟Tpd为20ns,响应CP下降沿的J-K触发器。LIBRARYIEEE；USEIEEE．STD_LOGIC_1164．ALL；ENTITYJKffISPORT(clear,preset,CLK,J,K：INSTDLOGIC：q,Nq：OUTSTD_LOGIC)；ENDJKff；ARCHITECTURErlOFJKffISPROCESS(clear,preset,CLK,J,K)BEGINIF(clear=‘0’)THENq＜=‘0’；Nq＜=‘1’；ELSIF(preset=‘0’)THENq＜=‘1’；Nq＜=‘0’：ELSIF(CLK’EVENTANDCLK=‘0’)THENIF(J=‘0’)AND(K=‘1’)THENq＜=‘0’AFTER20ns；Nq＜=‘1’AFTER20ns：ELSIF(J=‘1’)AND(K=‘0’)T既Nq＜=‘1’AFTER20ns；Nq＜=‘0’AFTER20ns：ELSIF(J=‘1’)AND(K=‘1’)THENq＜=NOTqAFTER20ns；Nq＜=NOTNqAFTER20ns：ENDIF；ENDPROCESS；ENDrtl；(5)主从J-K触发器。可根据主从J-K触发器特点自行编程。(6)集成计数器74163。ENTITYcounterl6ISPORT(cr,id,cp．ctt,ctp：INBit；d：INBitVECTOR(3DOWNTO0)；q：BUFFERBit_Vector(3DOWNTO0)；co：OUTBit)；ENDcounter16；ARCHITECTUREbehave_ctr16OFcounterl6ISBEGINPROCESS(cp)BEGINIF(cp=‘1’)THENIFcr=‘0’THENq＜=“0000”；ELSIFid=‘0’THENq＜=d；ELSIF(ctt=‘1’ANDctp=‘1’)THENIFq=“1111”THENq＜=“0000”；ELSEq＜=q+1；ENDIF；ENDIF；ENDIF；ENDPROCESS；c0＜=‘1’WHEN(q=“1111”ANDctt=‘l’)ELSE‘0’；ENDbch_ctr16；(7)集成移位寄存器74194。(请读者自行编写)。