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六十进制计数器
2 j3 g$ _( U* m" Llibrary ieee;
3 x4 h5 K5 l2 ?7 {use ieee.std_logic_1164.all;8 x* L/ j9 J; K) Q$ y
use ieee.std_logic_unsigned.all;
3 y0 a" l7 h$ J- N1 v! F1 Z( v
entity counter_60 is5 Z6 _- z: U0 U- P3 c
port(clk,bcd1wr,bcd10wr,cin:in std_logic;
: F7 j3 n9 }% n0 J! A co: out std_logic;2 M% r+ s9 ?% M9 R
datain: in std_logic_vector(3 downto 0);# v: f: T$ G3 i# ]/ u W5 @
bcd1: out std_logic_vector(3 downto 0);+ G$ q+ p$ k3 q4 Z6 y% q
bcd10: out std_logic_vector(2 downto 0));
( R# {6 e5 e# P8 {* x9 h# jend counter_60;
" A$ `, z- c; s2 O8 l3 a, t, U/ [+ }" V. X4 r, [$ N5 P1 O& }
architecture rtl of counter_60 is( d0 s4 v1 H, m
signal bcd1n:std_logic_vector(3 downto 0);
$ q k0 r- T, g9 I: R7 ~/ v$ e; e5 Csignal bcd10n:std_logic_vector(2 downto 0);) l. T6 x4 F6 L/ u4 h0 X4 `
begin
: S9 W$ I* @7 W' }3 ? bcd1<=bcd1n; x: i" s2 p2 G& g' G8 }$ ?8 o
bcd10<=bcd10n;+ b& V5 {1 a& G- O$ s$ j
process(clk,bcd1wr,datain) is
+ i! \4 U5 ]/ b2 U2 h( C begin A$ G, Q U* n# T
if(bcd1wr='1') then5 ]4 U1 O6 D Z
bcd1n<=datain;1 c' y3 ~1 z1 c) e' s8 p" i8 i
elsif(clk'event and clk='1') then5 ^1 U/ f2 X/ u' A8 A) Z1 |
if(cin='1') then
; r9 l0 Z; t q* ~1 L if(bcd1n=9) then
8 h7 c; }5 S+ x bcd1n<="0000";
" D; o2 K7 Z" M3 s/ ~' U else
) p7 U8 ~ Y H bcd1n<=bcd1n+'1';8 ~. }5 h3 r$ O1 g4 S6 W% c) e. ]
end if;; |& P9 s& G" [$ Z; T7 e7 R
end if;4 w8 E: r; l4 ?7 q/ }
end if;
: Y1 _! ?: N- W s end process;! L7 S& ?+ E! p
" o5 y! L0 v$ X+ c9 [) A process(clk,bcd10wr,datain) is
& C1 O7 ^) F# ? V. C6 E. R ` begin
. T; n. J/ F; _2 \# N if(bcd10wr='1') then
, D- ?1 C/ O f# k bcd10n<=datain(2 downto 0);
0 Y' Z5 z' M$ Y5 Z& P2 p9 Q& B2 d elsif(clk'event and clk='1') then2 _# B2 F6 u- k w$ a+ k
if(cin='1' and bcd1n=9) then! l% m& B: C+ j4 q
if(bcd10n=5) then
- A9 }- d% k1 S bcd10n<="000";' W% F* v! A5 V8 G& V4 u+ q% W
else
; C* w4 \' r! v$ U5 r( z! d) | bcd10n<=bcd10n+'1';7 d8 i% g6 e8 d$ z4 S' j
end if; p1 ]1 {) M _; {5 H B
end if;
! K8 \- B2 v& M, l& l end if;
- ~4 C. C( I* Y6 w end process;6 S$ i: f6 t: ~+ a |
* K, ]( @4 k- t: _/ Q- {8 ^1 V- _
process(bcd10n,bcd1n,cin) is
& e9 L( q3 X2 x begin
, F$ i" W3 v1 Y! J if((cin='1') and (bcd1n=9) and (bcd10n=5)) then3 v+ D/ @! U+ P$ Y# K1 h
co<='1';* @& e k0 Z M3 Z. G
else
* s/ O0 O( R9 e1 C5 r co<='0';
1 c6 S! q- z$ C. I end if;7 X/ a% K+ K& G6 K W' a" b3 u. _9 F
end process;8 _/ r6 J, r7 I# x2 c
end rtl;1 ~0 X$ Y; i% g: x
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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