《数字系统设计》总复习题

LIBRARY ieee;

USE ieee.std_logic_1164.ALL ; ENTITY dff IS

PORT(d,clk:IN std_logic; q, qb: OUT std_logic); END dff;

ARCHITECTURE behave OF dff IS BEGIN

PROCESS(clk) BEGIN

IF AND clk'event THEN q <= ; qb<=not d; END IF;

END PROCESS; END behave;

(二十)在下面横线上填上合适的语句,完成移位寄存器的设计。 说明:4位串入-串出移位寄存器有有1个串行数据输入端(di)、1个串行数据输出输出端(do)和1个时钟输入端(clk) LIBRARY ieee;

USE ieee.std_logic_1164.ALL; ENTITY siso IS

PORT(di: IN std_logic; clk:IN std_logic; do:OUT std_logic); END siso;

ARCHITECTURE a OF siso IS

SIGNAL q: std_logic_vector(3 DOWNTO 0); BEGIN

PROCESS(clk,di) BEGIN

IF clk’ event AND clk=’1’ THEN q(0)<= ; for loop q(i)<= ; END IF; END PROCESS; do<=q(3); END a;

(二十一)在下面横线上填上合适的语句,完成同步22进制计数器的设计。

LIBRARY ieee;

USE ieee.std_logic_1164.ALL; USE ieee.std_logic_unsigned.ALL; ENTITY counter22 IS

PORT( clk: IN std_logic; ch, c: OUT std_logic;

qb1, qa1: OUT std_logic_vector(3 DOWNTO 0)); END;

ARCHITECTURE behav OF counter22 IS

SIGNAL qb, qa: std_logic_vector(3 DOWNTO 0); SIGNAL cin: std_logic; BEGIN qb1<=qb; qa1<=qa; PROCESS(clk) BEGIN

IF clk'event AND clk='1' THEN

IF (qa= ) OR (qb=2 AND qa=1) THEN qa<=\ELSIF qa= THEN cin<='1'; qa<=qa+1; ELSE qa<= ; cin<='0'; END IF; END IF; END PROCESS;

PROCESS(cin, clk) BEGIN

IF clk'event AND clk='1' THEN

IF (qb=2 AND qa=1) THEN qb<= ; c<='1'; ELSE c<= ; END IF;

IF cin='1' THEN qb<= ; END IF; END IF;

END PROCESS; ch<=cin; END;

(二十二)在下面横线上填上合适的语句,完成一个“01111110”序列发生器的设计。

LIBRARY ieee;

USE ieee.std_logic_1164.ALL; USE ieee.std_logic_unsigned.ALL; USE ieee.std_logic_arith.ALL;

ENTITY senqgen IS

PORT(clk,clr,clock:IN std_logic; zo:OUT std_logic); END;

ARCHITECTURE art OF senqgen IS

SIGNAL count:std_logic_vector(2 DOWNTO 0); SIGNAL z:std_logic:='0'; BEGIN

PROCESS(clk,clr) BEGIN

IF clr='1' THEN count<=\ ELSE

IF clk='1' AND clk'event THEN

IF count= THEN count<=\ ELSE count<=count+1; END IF; END IF; END IF;

END PROCESS; PROCESS(count) BEGIN

CASE count IS

WHEN \ WHEN \ WHEN \ WHEN \ WHEN \ WHEN \ WHEN \

WHEN OTHERS=>z<= ; END CASE; END PROCESS; PROCESS(clock,z) BEGIN

IF clock='1' AND clock'event THEN zo<= ; END IF; END PROCESS; END art;

(二十三)在下面横线上填上合适的语句,完成一个“01111110”序列信号检测器的设计。

LIBRARY ieee;

USE ieee.std_logic_1164.ALL;

ENTITY detect IS

PORT( dataIN:IN std_logic; clk:IN std_logic; q:BUFFER std_logic); END detect;

ARCHITECTURE art OF detect IS

type statetype IS (s0,s1,s2,s3,s4,s5,s6,s7,s8); BEGIN

PROCESS(clk)

VARIABLE : ; BEGIN q<='0';

CASE present_state IS WHEN s0=>

IF dataIN='0' THEN present_state:=s1; ELSE present_state:=s0; END IF; WHEN s1=>

IF dataIN='1' THEN present_state:=s2; ELSE present_state:=s1; END IF;

WHEN s2=>

IF dataIN='1' THEN present_state:=s3; ELSE present_state:=s1; END IF;

WHEN s3=>

IF dataIN='1' THEN present_state:=s4; ELSE present_state:=s1; END IF;

WHEN s4=>

IF dataIN='1' THEN present_state:=s5; ELSE present_state:=s1; END IF;

WHEN s5=>

IF dataIN='1' THEN present_state:=s6; ELSE present_state:=s1; END IF;

WHEN s6=>

IF dataIN='1' THEN present_state:=s7; ELSE present_state:=s1; END IF;

WHEN s7=>

IF dataIN='0' THEN present_state:=s8; q<='1'; ELSE present_state:=s0; END IF; WHEN s8=>

IF dataIN='0' THEN present_state:= ; ELSE present_state:= ; END IF; END CASE;

clk='1'; END PROCESS; END art;

(二十四)在下面横线上填上合适的语句,完成序列信号发生器的设计。

说明:带异步复位为clr,时钟端为clk,输出端为q,串行输出指定序列(低位先出)。 LIBRARY ieee;

USE ieee.std_logic_1164.ALL; USE ieee.std_logic_arith.ALL; USE ieee.std_logic_unsigned.ALL; ENTITY senqgen IS

PORT(clr,clk:IN std_logic; q:OUT std_logic); END senqgen;

ARCHITECTURE beha OF senqgen IS

SIGNAL q_temp:std_logic_vector(2 DOWNTO 0); BEGIN

PROCESS(clk,clr) BEGIN

IF clr='1' THEN q_temp<=\

(clk'event AND clk='1') THEN IF q_temp=\ q_temp<=q_temp+1; END IF;

; END PROCESS; PROCESS(q_temp) BEGIN

CASE q_temp IS

WHEN \WHEN \WHEN \WHEN \WHEN OTHERS=> ; END CASE; END PROCESS; END beha;

(二十五)在下面横线上填上合适的语句,完成七人表决器的设计。

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