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六十进制计数器/ Q& c) u. P- D( z, c
library ieee;+ R& A+ @+ G( b4 I
use ieee.std_logic_1164.all;
' D5 x4 G, z: xuse ieee.std_logic_unsigned.all;- B" b R! b+ S) z
( s6 G7 H! V5 M% U7 E5 o8 E
entity counter_60 is
- q" e/ O9 f- _! ~6 E& n9 F port(clk,bcd1wr,bcd10wr,cin:in std_logic;
5 N+ \8 p: M, X2 a, h" |% h- r co: out std_logic;
5 R0 l; \( a3 o) n& q( H datain: in std_logic_vector(3 downto 0);
9 Q% e% {3 s% ~4 ^% I# G bcd1: out std_logic_vector(3 downto 0);
% j' S/ b* R$ r bcd10: out std_logic_vector(2 downto 0));
* y! G- E8 ~; a4 V- Yend counter_60;
# W* p! U& S( d+ u0 t) X; A0 k8 N
architecture rtl of counter_60 is
# U7 {; A+ W4 }9 Q; M% p! p! ` esignal bcd1n:std_logic_vector(3 downto 0);
# I; a$ O) j, [8 D4 Ysignal bcd10n:std_logic_vector(2 downto 0);
5 U! V# J: ^: v8 `3 kbegin
* r1 p' q4 {: k7 |- Z7 T- d# I bcd1<=bcd1n;0 Q! y% \! w+ M; f3 U
bcd10<=bcd10n;9 w( R+ w2 k' f) h, r8 [
process(clk,bcd1wr,datain) is
& ~: K! `8 @# ]5 ~2 O. ^( P' \% B begin
& ^& v& W0 V m u: M4 t if(bcd1wr='1') then
7 N# b0 N3 M6 i5 e: L6 K bcd1n<=datain;
. D1 O, l8 l4 C0 j9 { elsif(clk'event and clk='1') then
9 J9 t- C; o' h' l% o: N" B% K if(cin='1') then
9 A$ X4 S! x; N2 R2 l- M if(bcd1n=9) then7 |% F. M4 ^, u( S& ~
bcd1n<="0000";& K7 ~/ K+ P" D% @0 W/ t* ]6 _
else
4 t' G; L8 z( t; g$ [+ \" |3 Z/ \1 e bcd1n<=bcd1n+'1';. D: a% ^1 p3 ~, [3 x e! z
end if;
0 j" `( X! B) ` end if;" ^0 g- u h& w# S( r
end if;
( }9 \) d$ H9 P& R& | end process;( k* X( p; b- K1 Q0 P
t2 l3 k$ ^; C" ~1 k
process(clk,bcd10wr,datain) is
1 M) E3 ~3 |: O- d& G- I; c7 h! P& n4 ^ begin+ T5 y0 ]1 q" r2 u- \6 i
if(bcd10wr='1') then
$ `% ^# @4 ~: u7 S+ ~; r( p& ^3 j bcd10n<=datain(2 downto 0);. I" a* b0 P+ G$ X6 P
elsif(clk'event and clk='1') then. f# |3 T. [% B r; u; D9 t7 _% I
if(cin='1' and bcd1n=9) then; i4 d( G4 O( ]
if(bcd10n=5) then
3 a/ F( W# {% U: {4 |" _+ i bcd10n<="000";. Y4 Q2 N/ w! x
else
7 o8 k; {0 E. S% l+ i6 G% E bcd10n<=bcd10n+'1';2 _' E5 M# H5 Q& `
end if;
8 }( }$ B5 Z. t2 \3 z2 ` end if;
' x( ]: r+ ?% j end if;3 A. |, q& K# H' H
end process;
" M6 s4 O! [! M7 B* m8 ] 0 o2 W3 R% {+ H _
process(bcd10n,bcd1n,cin) is
0 K* Q; H: p+ k7 ?8 f begin
9 `5 V1 H: {+ F7 H if((cin='1') and (bcd1n=9) and (bcd10n=5)) then2 A! X: H ?- e1 s. U8 P$ A
co<='1';
. O6 r: Z9 a5 W9 s, t3 m, S else
1 u! t2 ]" i' ^" Z co<='0';4 K! P4 M) T, t! G S5 [# U; g
end if;
" V; ]2 H3 b4 v; B& X* \. G% [ end process;1 Z. S1 x- z$ E S; L( o/ w. Q3 ]# S
end rtl;
6 j% e0 G' j5 ^7 }1 l- _" \; Y3 t可以编译,但是仿真不合适,仿真不计数,请各位老师同仁指正,万分感谢 |
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