|
EDA365欢迎您!
您需要 登录 才可以下载或查看,没有帐号?注册
x
六十进制计数器9 Q0 }$ C; i+ d. N9 ? B
library ieee;; b# ~( n) Q4 \6 j. {" I
use ieee.std_logic_1164.all;9 j7 k' O% G3 y4 n5 x" E
use ieee.std_logic_unsigned.all;
" \* l J3 h& ~, i9 U) ^) X) r4 b8 _
entity counter_60 is
: \$ R5 J0 l& C5 N9 x5 T5 |3 y port(clk,bcd1wr,bcd10wr,cin:in std_logic;
# w' I& ~/ N4 A) X& ~) O2 b- s co: out std_logic;$ b9 A8 B6 {: b+ L$ a" A+ v9 J
datain: in std_logic_vector(3 downto 0);4 d0 `. b/ ]( H6 G5 r
bcd1: out std_logic_vector(3 downto 0);
; j+ o s8 `$ ?; ? ] bcd10: out std_logic_vector(2 downto 0));1 j$ u$ P* Q8 J& n6 w
end counter_60;
5 R2 {/ i4 W5 Y+ z' @8 Q& \" l o$ [3 r* e
architecture rtl of counter_60 is! P! Z0 S2 c; c! s6 D1 ?% N9 W
signal bcd1n:std_logic_vector(3 downto 0);& D( R' Q! u' G# L4 V& u9 w2 I
signal bcd10n:std_logic_vector(2 downto 0);3 i* D- L. A6 o1 }# \' J# P
begin
! |, R6 T" G0 z& A" I" ^ bcd1<=bcd1n;
& L& n/ n" d2 u- } bcd10<=bcd10n;% r A8 k6 d w1 w* W1 J
process(clk,bcd1wr,datain) is
: h+ M% x; X" V! x1 U8 C8 W begin
+ y% y/ m, l! j4 L* } if(bcd1wr='1') then
+ b$ X! s6 d' _1 k+ g8 s: U4 g* d bcd1n<=datain;
2 r+ l. o9 e7 Z2 L elsif(clk'event and clk='1') then
* M# j1 e" H- _. F3 e if(cin='1') then
, x8 e+ _4 _, a% W/ L) D/ h3 o if(bcd1n=9) then6 k: I' g5 Y4 T! P
bcd1n<="0000";0 K+ e. Q9 c' J: s. E& \
else" y q! j# d6 a/ S1 l: S( a
bcd1n<=bcd1n+'1';
$ u5 u3 V/ d9 p* m% x end if;
5 [1 W; T0 R9 y- g' t end if;* \3 M H4 x2 Z/ D" b; }
end if;$ P2 E- Q- D, H
end process;8 c3 b. @& T# i. j% x
: D t+ M. k, H4 ^, C, D9 L
process(clk,bcd10wr,datain) is
7 u: x0 }! _1 J$ m! m0 Y begin
" n5 ?, h3 I& h4 G" w if(bcd10wr='1') then$ h: B# z; I7 L7 j
bcd10n<=datain(2 downto 0);
" J% D; T" `. k elsif(clk'event and clk='1') then7 z7 k5 k5 J( Z
if(cin='1' and bcd1n=9) then$ F/ }$ ~, y. D, Q) W, [" z
if(bcd10n=5) then
' G. I7 X9 S9 r3 @; p* f3 H bcd10n<="000";
`; e* {1 K8 V6 [) b) k% k# E) Z else
4 S3 H8 G: E! C W) R8 u9 c! J bcd10n<=bcd10n+'1';
# B6 `% f0 k- x2 L5 z- z end if;6 B- s& E0 b5 M5 l
end if;
, Y9 m! l5 |" R9 R9 g end if;- H! F' W8 c" G( d% Q6 a
end process;
4 E& a% l% o6 W, o8 P# b
# L" e- U8 {5 a7 q+ V# r* o; p& Z process(bcd10n,bcd1n,cin) is4 S, |. p2 L! t9 k+ \
begin
. x4 ^ o0 A P) F, }- h if((cin='1') and (bcd1n=9) and (bcd10n=5)) then t4 h) |! \3 c& X
co<='1';
. z e: }8 d# r3 j2 B. D* i* r else- N: P7 L, r e, R/ J
co<='0';
; d+ s% ~- y7 G: ?9 V end if;0 G+ U/ v! ?4 G; _' R. F/ Y# l; D
end process;, L0 o0 f. z# b
end rtl;
2 i. E7 h1 D$ T5 }+ Q6 I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 |
|