·¢²¼Ê±¼ä : ÐÇÆÚÁù ÎÄÕÂEDA¼¼ÊõÏ°Ìâ-ÐÞ¶©°æ¸üÐÂÍê±Ï¿ªÊ¼ÔĶÁ2712a6276edb6f1aff001f50
IF CLRN=¡¯0¡¯THEN CQI<=¡±0000¡±;
ELSEIF CLK¡¯EVENT AND CLK=¡¯1¡¯THEN IF LDN=¡¯0¡¯THEN CQI<=D;ELSE IF ENA=¡¯1¡¯THEN
IF CQI<5 THEN CQI<=CQI+1; ELSE CQI<=¡±0000¡±; END IF; END IF; END IF; END IF; Q<=CQI; END PROCESS;
COUT<=NOT (CQI(0) AND CQI(2)); END one;
ÔÚÔ´³ÌÐòÖУ¬D[3..0]ÊǼÆÊýÆ÷µç·µÄÔ¤ÖÃÊý¾ÝÊäÈë¶Ë£¬Q[3..0]ÊǼÆÊýÆ÷µÄ״̬Êä³ö¶Ë£¨¿¼ÂÇÒëÂëµç·µÄ4λÊý¾ÝµÄÊäÈëÐèÇó£¬ÉèÖÃÁË4λ״̬룩£»CLKÊÇʱÖÓÊäÈë¶Ë£»CLRNÊǸ´Î»¿ØÖÆÊäÈë¶Ë£¬µ±CLRN=0ʱ£¬Q[3..0]=0000£»LDNÊÇÔ¤ÖÿØÖÆÊäÈë¶Ë£¬µ±LDN=0ʱ£¬Q[3..0]=D[3..0]£»ENAÊÇʹÄÜ¿ØÖÆÊäÈë¶Ë£¬µ±ENA=1ʱ£¬¼ÆÊýÆ÷¼ÆÊý£¬ENA=0ʱ£¬¼ÆÊýÆ÷±£³Ö״̬²»±ä¡£´ø¸´Î»ºÍÔ¤ÖÿØÖƵÄÁù½øÖƼӷ¨¼ÆÊýÆ÷CNT6_1µÄ·ÂÕ沨ÐÎÈçͼ3.6Ëùʾ.
14. ½â:´ø¸´Î»ºÍÔ¤ÖÿØÖƵÄÊǽøÖƼӷ¨¼ÆÊýÆ÷CNT10_1µÄVHDLÔ´³ÌÐòÈçÏÂ:
LIBRARY IEEE:
USE IEEE.ATD_LOGIC_1164.ALL; USE IEEE.STD_LOGIC_UNSIGNED.ALL; ENTITY CNT10_1 IS
PORT(CLK,CLRN,ENA,LDN:IN STD_LOGIC;
D:IN STD_LOGIC_VECTOR(3 DOWNTO 0); Q:OUT STD_LOGIC_VECTOR(3 DOWNTO 0); COUT:OUT STD_LOGIC);
END CNT10_1;
ARCHITECTURE one OF CNT10_1 IS
SIGNAL CQI:STD_LOGIC_VECTOR(3 DOWNTO 0):=¡±0000¡±; BEGIN
PROCESS(CLK,CLRN,ENA,LDN) BEGIN
IF CLRN=¡¯0¡¯THEN CQI<=¡±0000¡±;
ELSEIF CLK`EVENT AND CLK=¡®1¡¯THEN IF LDN=¡®0¡¯THEN CQI<=D;ELSE IF ENA=¡¯1¡¯THEN
IF CQI<9 THEN CQI<=¡±0000¡±; END IF; END IF; END IF;
END IF; Q<=CQI; END PROCESS;
COUT<=CQI(0) AND CQI(3); END one;
ÔÚÔ´³ÌÐòÖУ¬D[3..0]ÊÇÊ®½øÖƼӷ¨¼ÆÊýÆ÷µç·µÄÔ¤ÖÃÊý¾ÝÊäÈë¶Ë£»Q[3..0]ÊǼÆÊýÆ÷µÄ״̬Êä³ö¶Ë£»CLKÊÇʱÖÓÊäÈë¶Ë£»CLRNÊǸ´Î»¿ØÖÆÊäÈë¶Ë£¬µ±CLRN=0ʱ£¬Q[3..0]=0000£»LDNÊÇÔ¤ÖÿØÖÆÊäÈë¶Ë£¬µ±LDN=0ʱ£¬Q[3..0]=D[3..0]£»ENAÊÇʹÄÜ¿ØÖÆÊäÈë¶Ë£¬µ±ENA=1ʱ£¬¼ÆÊýÆ÷¼ÆÊý£¬ENA=0ʱ£¬¼ÆÊýÆ÷±£³Ö״̬²»±ä¡£´ø¸´Î»ºÍÔ¤ÖÿØÖƵÄÊǽøÖƼٷ¢¼ÆÊýÆ÷CBT10_1µÄ·ÂÕ沨ÐÎÈçͼ3.7Ëùʾ.
15. ½â£ºÀûÓÃÌâ13Éè¼ÆµÄCNT6_1ºÍÌâ14Éè¼ÆµÄCNT10_1¼ÆÊýÆ÷,Éè¼ÆµÄÁùÊ®½øÖƼÆÊýÆ÷CNT60_1µÄÔÀíͼÈçͼ3.8Ëùʾ.
ͼ3.8Ëùʾ¶íÔÀíͼÊÇÓÃMAX+plus¢òµÄÔÀíͼÊäÈë·¨Éè¼ÆµÄ,µ«ÓеÄEDA¸ù¾Ý²¢²»Ö§³ÖÔÀíͼÊäÈëÉè¼Æ·¨,Òò´ËÒªÇóʹÓÃVHDLµÄÔª¼þÀý»¯Óï¾äʵÏÖµç·Éè¼Æ.ÓÉͼ3.8ËùʾµÄÔÀíͼ¿ÉÖª,ÁùÊ®½øÖƼÆÊýÆ÷Éè¼ÆÐèÒª1Ƭʮ½øÖƼÆÊýÆ÷CNT10_1,1ƬÁù½øÖƼÆÊýÆ÷CNT6_1ºÍ1ƬÁ½ÊäÈë¶ËµÄÓëÃÅAND2_1(¼´Í¼3.8ÖеÄAND2).CNT6_1ÒÑÔÚÌâ14Éè¼ÆºÍÌâ13Éè¼ÆÖÐÍê³É,»¹ÐèÒªÉè¼ÆÒ»¸öÁ½ÊäÈë¶ËµÄÓëÃÅAND2_1.AND2_1µÄVHDLÔ´³ÌÐòÈçÏÂ:
LIBRARY IEEE:
USE IEEE.ATD_LOGIC_1164.ALL; USE IEEE.STD_LOGIC_UNSIGNED.ALL; ENTITY AND2_1IS
PORT(a,b:IN STD_LOGIC;
y:OUT STD_LOGIC);
END AND2_1;
ARCHITECTURE one OF AND2_1 IS BEGIN
Y<=a AND b; EMD one;
ʹÓÃVHDLµÄÔª¼þÀý»¯Óï¾äÉè¼Æµç·ʱ£¬Ê×ÏÈÐèÒª½«Ê¹ÓõÄÔª¼þÔÚ³ÌÐò°üÖÐÉùÃ÷£¬ÁùÊ®½øÖƼÆÊýÆ÷Éè¼ÆÐèÒªµÄCNT10_1¡¢CNT6_1ºÍAND2_1ÔÚ³ÌÐò°ümy_pkg_1µÄÔª¼þÉùÃ÷ÈçÏ£º
LIBRARY IEEE:
USE IEEE.ATD_LOGIC_1164.ALL; PACKAGE my_pkg_1 IS Component CNT10_1
PORT(CLK,CLRN,ENA,LDN:IN STD_LOGIC;
D:IN STD_LOGIC_VECTOR(3 DOWENTO 0); Q:OUT STD_LOGIC_VECTOR(3 DOWNTO 0); COUT:OUT STD_LOGIC); END Component;
Component CNT6_1 --Áù½øÖƼÆÊýÆ÷µÄÔª¼þÉùÃ÷
PORT(CLK,CLRN,ENA,LDN:IN STD_LOGIC;
D:IN STD_LOGIC_VECTOR(3 DOWNT 0); Q:OUT STD_LOGIC_VECTOR(3 DOWNT 0); COUT:OUT STD_LOGIC); END Component; Cpmponent AND2_1
PORT(a,b:IN STD_LOGIC) y:OUT STD_LOGIC); END Component; END my_pkg_1;
ʹÓÃVHDLµÄÔª¼þÀý»¯Óï¾äÉè¼ÆµÄÁùÊ®½øÖƼÆÊýÆ÷µÄVHDLÔ´³ÌÐòCNT60_1ÈçÏ£º
LIBRARY IEEE:
USE IEEE.ATD_LOGIC_1164.ALL; USE work.my_pkg_1.ALL; ENTITY CNT60_1 IS
PORT(CLK,CLRN,ENA,LDN:IN STD_LOGIC; D:IN STD_LOGIC_BECTOR£¨DOWNTO 0£©; Q:OUT STD_LOGIC_VECTOR(7 DOWNTO 0); COUT:OUT STD_LOGIC); END CNT60_1;
ANCHITECTURE one OF CNT60_1 IS SIGINAL a,b:STD_LOGIC; BEGIN
u1:cnt10_1 PORT MAP(CLK,CLRN,ENA,LDN,D(3 DOWNTO 0),Q(3 DOWNTO 0),a); u2:cnt6_1 PORT MAP(CLK,CLRN,a,LDN,D(7 DOWNTO 4),Q(7 DOWNTO 4),b); u3:AND2_1 PORT MAP(a,b,COUT); END onew;
ÔÚÁùÊ®½øÖƼÆÊýÆ÷CNT60_1µÄVHDLÔ´³ÌÐòÖУ¬ÉùÃ÷ÁËÁ½¸öÐźÅaºÍb×÷Ϊµç·ÄÚ²¿µÄÁ¬Ïߣ¬ËüÃÇ·Ö±ð½ÓÓÚCNT10_1ºÍCNT6_1µÄ½øλÊä³ö¶ËCOUT¡£
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