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六十进制计数器- k k6 {/ I( R3 q5 _
library ieee;& z; k$ V) A9 k, H6 J0 R' ]; T
use ieee.std_logic_1164.all;: a5 f8 E' C9 J% z [! Q
use ieee.std_logic_unsigned.all;
/ m5 S1 |5 d4 i! R" S
* U, s V4 `& tentity counter_60 is* q+ b& ^/ V! ?4 |: c- G$ s
port(clk,bcd1wr,bcd10wr,cin:in std_logic;
! j- f! @2 h4 o; w3 n co: out std_logic;
/ S3 \# n8 i; z. k8 g datain: in std_logic_vector(3 downto 0);' l6 i, X& [# F& f8 w0 s
bcd1: out std_logic_vector(3 downto 0);
. Z+ g# |% W/ x# F. K4 _ bcd10: out std_logic_vector(2 downto 0));
$ O8 M+ s% [6 z- l1 W$ y0 b1 y% w% u# Jend counter_60;
: r- A8 S9 F7 I& w% n4 Q, n" I; A* p4 [$ c5 a5 T
architecture rtl of counter_60 is6 s3 u8 e) A' n2 {4 M$ ]; P
signal bcd1n:std_logic_vector(3 downto 0);
" {+ d, G1 q# \* M. nsignal bcd10n:std_logic_vector(2 downto 0);
' X6 {6 h, }" o$ o) ebegin
7 i6 ]6 y" k, V7 P bcd1<=bcd1n;
" h5 ~' p3 [" D! U6 K bcd10<=bcd10n;/ U! d5 B5 ?+ d
process(clk,bcd1wr,datain) is; R0 @9 B0 K$ ^ ^& l0 p
begin
. z+ s% G5 J# ^* u# H' K- L+ H$ g if(bcd1wr='1') then
% D ~/ g$ p: h& ~4 Z/ k, t bcd1n<=datain;" Q# ?' J% ^- v# |0 |5 t
elsif(clk'event and clk='1') then
$ E/ b' M# u+ A( \9 Z+ D: \ if(cin='1') then3 v( n3 J! z; z5 q6 p
if(bcd1n=9) then" E- x& ~8 {+ }+ b9 j% [9 H+ B
bcd1n<="0000";
& k7 J" G' J; y# P+ z$ k else
! l- H* H: |0 Q* C c, P bcd1n<=bcd1n+'1';' w( d6 u) e! _
end if;7 s8 e" {+ j& J: H6 L
end if;; w0 T( O) h f" N6 b5 K( c/ _, T9 |; C
end if;
) m1 t. [" u5 z' t; j3 }: X8 @ end process;
) ]' v8 i6 y2 {- n
: N9 b+ b9 @; U; O e# ~2 u process(clk,bcd10wr,datain) is$ z# B. C. {( z
begin7 u3 f/ ]3 ]% c' i
if(bcd10wr='1') then
% _; P& f+ _! g+ J; I/ V bcd10n<=datain(2 downto 0);# x3 L, M) N9 w; Z* y) t
elsif(clk'event and clk='1') then9 U+ ~2 g( z: x4 J7 ?& w) U/ {7 W' u
if(cin='1' and bcd1n=9) then# s% O' i- O$ a$ p) u
if(bcd10n=5) then* t+ c) @( Y6 R5 P; d; o
bcd10n<="000";
& N( N) d1 Y- J' J else$ J+ {/ d; Y& @% b/ i/ n
bcd10n<=bcd10n+'1';
2 ]. P @# p% }' v$ i" W) p& m end if;
/ H( _- D- p$ u2 ~0 n1 K9 | end if;* J4 W9 X# j5 R! G# p# G
end if;7 e6 u7 g; ~# z4 ], `" ]
end process;4 F) f9 A! w& x0 K% _
/ @% U( B# h% L" u) i) k process(bcd10n,bcd1n,cin) is
& z9 q' a; K7 X; e( j begin6 U5 ` ^ c7 n' |
if((cin='1') and (bcd1n=9) and (bcd10n=5)) then4 E n. N- K$ A6 v! U# ~, x* a2 X
co<='1';
4 p4 w9 h5 Q8 @; g else: A3 P+ u5 v" O) C: V
co<='0';. t$ b- D- ]: r% Y
end if;
/ A8 E1 M9 n* X7 _ end process;
! L, B( h, y) X6 A( j! oend rtl;9 w7 n i% I$ w4 |" r* z
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 |