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六十进制计数器( {! K0 f# o" ^' f7 w
library ieee;" r" ?% t/ m8 {
use ieee.std_logic_1164.all;& t2 n5 s0 a) [2 }) D
use ieee.std_logic_unsigned.all;+ E. J1 a. x: @2 n8 A" J5 i
! u/ W) U# ?, u% Jentity counter_60 is+ N$ H' A+ n* Z
port(clk,bcd1wr,bcd10wr,cin:in std_logic;$ N$ f" O$ J6 {: F' Q
co: out std_logic;
3 X! s6 |2 q. v$ S! t* S datain: in std_logic_vector(3 downto 0);
% @( _7 V# N4 N, j bcd1: out std_logic_vector(3 downto 0);1 L) j$ M2 y* Y4 K' r4 k4 l" ]3 u, D5 v
bcd10: out std_logic_vector(2 downto 0));
2 p* u. f8 v9 R" {. _1 c2 F Q3 lend counter_60;! Q& |& _1 N- y1 B' [! q1 o' g
' ?4 {1 j$ C% x
architecture rtl of counter_60 is
) V/ i, d' [$ P. Gsignal bcd1n:std_logic_vector(3 downto 0);6 w% f: }4 B) F; F
signal bcd10n:std_logic_vector(2 downto 0);. L' H) b8 E, Q6 W2 A! S( a
begin% h- q" k" j+ ~3 {" d# C$ r
bcd1<=bcd1n;' ~4 m, C( N. E# ^6 y- A
bcd10<=bcd10n;
& R; e1 s& H7 @* p M g. k process(clk,bcd1wr,datain) is. r3 ]% f( y( j# p
begin
, G- G" c6 ?; i* f if(bcd1wr='1') then
7 i; E+ l, {0 n3 G bcd1n<=datain;
& Y9 q; `6 a2 e elsif(clk'event and clk='1') then
' q3 g u7 H, v8 N, c if(cin='1') then/ B F: Z; g0 p5 O
if(bcd1n=9) then2 }5 f/ ^( ]+ a/ r
bcd1n<="0000";
0 H2 i6 R" Y0 H" S, } else
+ A9 i+ I# \* t# Q) w bcd1n<=bcd1n+'1';
5 V/ K. b, V1 C: M6 W/ L end if;7 k/ O$ V. o+ W: P4 z# T. d. c0 D
end if;
; c7 i9 [2 k5 Y0 ]3 {1 S! b end if;
" f6 m- P! I8 Q( s) o4 F end process;& I, n7 y {- R# e$ l: w9 a( r/ m4 r
& l" u) P; ~3 o {2 Q
process(clk,bcd10wr,datain) is* ]% a# _' z7 s1 ?2 n
begin% I+ [+ G% l% g2 ?5 K3 H
if(bcd10wr='1') then* y. K# Z& P2 R* h
bcd10n<=datain(2 downto 0);: H% I7 N N/ x6 U4 v9 i; E
elsif(clk'event and clk='1') then
0 }& h1 {+ o7 l4 v$ h5 t if(cin='1' and bcd1n=9) then
. t8 ?" c, o( I3 f6 h( N: N& k _6 w if(bcd10n=5) then0 t6 G& Q: J+ p/ f' P o
bcd10n<="000";
) j# l7 M# T/ a8 ^ else- ~7 A% o v# m- Q
bcd10n<=bcd10n+'1';
* k' s, @% ?' F) ^, X4 i/ A end if;
7 B: r q9 M, _ h+ ` end if;
" i% } d$ s; D end if;
! g9 A2 O# O' [ end process;
" ~) G) r3 Q; U 7 k$ Y+ g: R/ q4 J* y8 k7 A
process(bcd10n,bcd1n,cin) is
7 Y0 b, _7 _6 B begin
6 Z6 ~. Y3 U4 a4 r$ I* K if((cin='1') and (bcd1n=9) and (bcd10n=5)) then7 O9 O5 n, b' Q0 {" b
co<='1';
/ M! S" ?: E4 E$ N ? else1 _# ~$ K6 N1 x0 }% H) i6 E1 m
co<='0';+ W9 g0 d) ?* M
end if;, W" o( D8 d6 S( l+ c! a7 [/ L
end process;1 g. [, e/ ?3 x" Z' Y% k: I( L
end rtl;
: e' N5 m9 z8 e5 M6 h: J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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