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六十进制计数器
* Q S- J5 c7 Z6 _( Q0 zlibrary ieee;; L4 h9 S/ ^' z( d% ]
use ieee.std_logic_1164.all;
- \4 D& d% K4 k( Ause ieee.std_logic_unsigned.all;
) }: d( C- S& T5 \$ k" {# d7 c, m) J
2 f4 ?6 z7 c" B$ eentity counter_60 is/ [0 Z7 W6 t1 w {, H- h" B8 p
port(clk,bcd1wr,bcd10wr,cin:in std_logic;
! }( c5 j. G! C1 R& I. O- K/ A co: out std_logic;9 |' V# V$ o% S B7 c
datain: in std_logic_vector(3 downto 0);/ `) E+ a7 w" [. b6 }$ r
bcd1: out std_logic_vector(3 downto 0);& _/ w" I, p6 H
bcd10: out std_logic_vector(2 downto 0));; U( a. E. o' }7 X2 b8 `+ w
end counter_60;; M) g5 F, i& s w6 X
% d1 I. S/ n- S6 [( `2 R& I- O6 n
architecture rtl of counter_60 is2 c$ r& v. v3 X% G+ n" Z$ } h4 ~
signal bcd1n:std_logic_vector(3 downto 0);8 F& T# Q7 ~8 c+ w
signal bcd10n:std_logic_vector(2 downto 0);
1 M3 ~2 W9 d5 S z* k+ kbegin
$ @$ n& L6 o$ l$ P" A% \ bcd1<=bcd1n;5 |+ R; f: h h- j$ t# P
bcd10<=bcd10n;! V! H2 u1 T; O$ ^% r% O2 N
process(clk,bcd1wr,datain) is
. P/ ~9 x( O% M2 P+ J1 C* W begin
, h0 {' D* M9 R, O: U if(bcd1wr='1') then
/ M: A$ r" g2 b o: r/ f7 }$ w bcd1n<=datain;
% h/ r, g7 D2 E* r, n8 f elsif(clk'event and clk='1') then
3 z' f/ i- l- f. Q! @6 q" o if(cin='1') then
8 }" F7 ~0 s: t if(bcd1n=9) then0 f8 v5 K5 n3 q' L9 y0 V) {
bcd1n<="0000";
3 t' H: M9 u0 O" u# y1 F V+ r) e% O# B else
/ R2 q/ Z+ u, |6 M' o bcd1n<=bcd1n+'1';; T0 `( d% R" b* `
end if;7 \% a8 n/ ]2 q( H, e8 h; b+ \: {+ G' F
end if;
. c! [7 k, ~- ~" y& U4 t end if;$ Q: l' K% L8 I, Q% {+ n
end process;5 `5 Y3 r' g" Z' Z, B& c
5 r3 E3 u. r K' j; b! l2 H) o
process(clk,bcd10wr,datain) is
4 W3 a1 D& _! G, U2 D. w0 d7 K* @ begin
7 v, H0 v7 c0 S v if(bcd10wr='1') then& Z6 ?0 O; |$ E. z: s
bcd10n<=datain(2 downto 0);
0 S, R' ~# s Z elsif(clk'event and clk='1') then
9 A& Q0 Q( f/ m% V9 L if(cin='1' and bcd1n=9) then
6 [) y8 c/ _3 ~$ ? V6 K if(bcd10n=5) then, T% D" ?) m8 [: G; _- H' b
bcd10n<="000";: R# y( b' X0 l$ x
else9 O" V2 {( K( A& u' k
bcd10n<=bcd10n+'1';* v1 R6 B9 P" X* \
end if;4 i0 K% N; ]2 y5 W
end if;
/ l( s5 ~0 N: ?0 o9 r end if;
7 w3 R- q- r* F& ?. f end process;
& t6 _1 {1 A7 c6 s/ b5 U
' u9 B4 G, [ n' f! ` process(bcd10n,bcd1n,cin) is! L4 o0 w; C& p0 {. G0 S1 ^
begin
0 T$ ]' q! w7 a if((cin='1') and (bcd1n=9) and (bcd10n=5)) then/ o0 q( v/ c4 M( E/ }, o% R3 Z. k
co<='1';; r" [2 V4 K. F7 o* o2 S; E7 [
else1 B$ k2 ~! u4 W. z6 U" k
co<='0';& D! B( F& m$ J+ Q+ a% G% Y& b' u
end if;0 U, J8 X3 A# ?3 ~$ a- |
end process;
* U0 A( Q) S; C( i; Y9 xend rtl;& o- I& o) @2 Y& `% Q4 ~
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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