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六十进制计数器
1 ?* ~' d( p; z5 e4 Q) _1 _library ieee;% `: G( p# h7 f9 f7 _
use ieee.std_logic_1164.all;1 O) M. M' z8 y# X$ B( t% r
use ieee.std_logic_unsigned.all;0 H6 A+ Y i) t) k
9 w% d; E, Z. ]8 Hentity counter_60 is
' p+ K1 z* u* K Y. v8 F0 ` port(clk,bcd1wr,bcd10wr,cin:in std_logic;
7 V: n, f/ K+ w H' p' W0 k co: out std_logic;0 ]8 L. {; P3 X/ T' a' [
datain: in std_logic_vector(3 downto 0);" _9 b. u2 e7 A& T; T
bcd1: out std_logic_vector(3 downto 0);
) ~8 J6 J z x# z6 w- { bcd10: out std_logic_vector(2 downto 0));
" W* o$ ]6 I5 X# f" C5 N6 [end counter_60;
- Q, @; n4 n1 _: g' K
$ Y0 ?1 f9 B, m; E* Larchitecture rtl of counter_60 is0 m) M1 R6 V2 s5 u" `
signal bcd1n:std_logic_vector(3 downto 0);' a/ P9 c2 g7 R% C p
signal bcd10n:std_logic_vector(2 downto 0);
" R( b4 E! p, m# \/ H9 ~- pbegin
# E2 s' w% u' t; N; J bcd1<=bcd1n;( x1 x" K/ @% L9 d
bcd10<=bcd10n;4 Z# J2 P) ?& P6 d. v+ g6 L
process(clk,bcd1wr,datain) is
- C: t. R6 L; g& ] begin
9 o6 ~4 c3 L. y8 G* o if(bcd1wr='1') then
% r# K* t& L# H3 H8 J bcd1n<=datain;
- ]9 {* `6 p L4 _0 ?1 r: G& X elsif(clk'event and clk='1') then! ?# |9 s" ]# F6 k/ Z2 L
if(cin='1') then
. r6 ~( [- `/ h) l if(bcd1n=9) then
4 k$ _% @7 s5 X x2 O. e: S% Q) l& S bcd1n<="0000";- s a, g P- g5 L8 k4 _
else
* v$ @2 `0 R; j* s bcd1n<=bcd1n+'1';
& G/ l. L `$ h) ~+ g' d end if;6 ^! {) c. X" ~# ~+ i: K
end if;& x- m3 Y9 D+ ^4 m
end if;
; s0 u( m' v. v+ j( ] end process;
# ~1 U7 C+ D1 I1 L4 w: ~
1 S! I( g* T0 y1 J$ e/ P# S process(clk,bcd10wr,datain) is r: Z2 p% n- \% j5 U
begin
* H( K4 C, Z! [. z, \ if(bcd10wr='1') then2 a7 Q$ Q9 F; s# S
bcd10n<=datain(2 downto 0);, X! g, H3 x5 V
elsif(clk'event and clk='1') then, I# t6 B6 N% S- j$ B3 b7 F! u& P/ V
if(cin='1' and bcd1n=9) then
# z1 {8 V* s7 y! s if(bcd10n=5) then
6 J# V& T7 \' u; }! Q" b" d' f; b, R bcd10n<="000";4 R) l# Z1 b) e* M$ V
else6 K' q3 h- b+ C6 o
bcd10n<=bcd10n+'1';6 Y7 a p* n! S+ s2 [1 Z
end if;: H! x9 N6 F8 [/ x
end if;
. I4 u- M' y" a end if;
/ V! {" `" A9 t2 d2 X" \/ l end process;
/ `" X, `- x. o3 Q' y' y7 }* A1 z
2 X7 k1 D- o0 d6 J x1 Q) O! I- U process(bcd10n,bcd1n,cin) is
6 v( p# ^! l7 C( Y7 E9 y7 E begin
0 K! m( z3 B7 A if((cin='1') and (bcd1n=9) and (bcd10n=5)) then
8 ~8 {+ D2 ]) F" d' z/ c co<='1';
; {, Q, C# U3 }- S* K else
' y- P9 E) e) B5 c8 V co<='0';
, Z K6 c$ L$ K; t; I0 D" v* u end if;9 Z; E8 l& w) k4 t+ S% A- E. Z, Y; E
end process;
, `) a n- A* B- B! \end rtl;
1 \+ \' R6 ?( U, L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 |