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仿真的时候就是不对。。。
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% P1 R5 I8 b" J B8 }( R Qlibrary ieee;# `6 a. ^# E0 k; v Z0 l( O
use ieee.std_logic_1164.all;% ^" d# J5 ^6 l6 q$ f* [0 j' ?' d
use ieee.std_logic_arith.all;1 v( ]+ L9 B4 `" Q* f
use ieee.std_logic_unsigned.all;
8 k( ~9 |7 [( H% z3 [! Eentity cnt100 is
" f9 ~4 c" h8 ` C port(clk:in std_logic;
9 m7 {$ t3 v, k& P: M4 z# } q ut std_logic_vector(7 downto 0);5 n, x: x8 y( y7 Q3 Z! s
c ut std_logic);
7 b3 z* v, X' C$ {end cnt100;
) ~$ \% F) E, t) u, R g3 {architecture one of cnt100 is
3 U4 Q$ ?; r5 X7 |: B/ ysignal qa:std_logic_vector(3 downto 0);( G5 m% U$ F5 X
signal qb:std_logic_vector(3 downto 0);( O g, j8 A! {4 y! t4 }
signal cin:std_logic;
% M$ R$ F/ N- K+ ~" {. lbegin
3 ]$ A1 Y0 z) u0 V' O' U q(3 downto 0)<=qa;
0 ?8 A+ Y6 H' t0 _ S1 o! g) e4 w, q q(7 downto 4)<=qb;
# W [) P5 C- b7 |8 @+ B process(clk): e: h* m! L# |% ]% A4 U
begin
0 o6 |: y' z. v7 j b if clk'event and clk='1' then
$ ~% Q: ]+ D9 a if qa=9 then qa<="0000";cin<='1';
, L1 @8 l* G, g7 o! T, p# F/ I( E else qa<=qa+1;cin<='0';
- ~% u- i; T o* B1 ?$ L- u end if;: `( Q' x* _: V3 I. P
end if;$ e& \' ]7 _7 j
end process;
" ]* p5 E" s7 C$ V process(clk,cin)
0 \5 O7 o: l1 o+ } begin4 E6 H5 _: R* B8 A( G5 }3 r$ E
if clk'event and clk='1' then
2 W9 V; [( q3 L& \7 D if (qb=9 and qa=9) then qb<="0000";c<='1';
7 r( l7 u/ C$ p7 L- _5 l else c<='0';
: j: F$ [0 Y9 U end if;
, u k0 M1 Z2 w) f! ~7 V/ Z2 r" D if cin='1' then qb<=qb+1;/ W* I6 W$ y2 U, K" s
end if;
- `/ F8 \( Q: c) ]+ {' y- A end if;8 o4 T, u7 F! j
end process;7 i* h# U: x! O, x& ]
end one; |
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