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六十进制计数器, M! y2 G0 [+ [8 D8 y
library ieee;3 U8 |3 e! V' G2 a: v
use ieee.std_logic_1164.all;1 f. u. |8 W3 |3 w/ z( P! A/ V4 C
use ieee.std_logic_unsigned.all;: q- T( ~, |+ V9 J4 o9 T9 n0 v7 E# P x
! S: E6 Y" M2 Ientity counter_60 is
7 C9 e4 p" R3 B g- A) T port(clk,bcd1wr,bcd10wr,cin:in std_logic;
( `% t G3 L) O/ T co: out std_logic;
2 f/ S% L! e# U& d. N datain: in std_logic_vector(3 downto 0);
" O. z" K$ N8 u8 ^/ W+ S& f' z bcd1: out std_logic_vector(3 downto 0);
1 C0 t# ~" c, O bcd10: out std_logic_vector(2 downto 0));6 ]! I; A# E' G$ \$ |1 J" {) I' W5 C
end counter_60;
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* A. v( s" `1 k7 r& ]. Tarchitecture rtl of counter_60 is
8 ]) z% M0 a$ m9 S* q4 usignal bcd1n:std_logic_vector(3 downto 0);9 d$ _ U4 W& z
signal bcd10n:std_logic_vector(2 downto 0);
6 K5 m* R+ q) f- Pbegin
8 o T. R I4 s% Y7 ]8 K bcd1<=bcd1n;" ]5 z" \, E$ |
bcd10<=bcd10n;
4 m ~! J+ _7 c5 A; z process(clk,bcd1wr,datain) is# ?# ]/ A& J1 D: z# ^$ E
begin
1 ~8 ^" ^% e+ s' h5 ]7 y( w if(bcd1wr='1') then9 u F7 _. P( O% H+ B; P: d
bcd1n<=datain;
, Y0 S6 n V# o elsif(clk'event and clk='1') then5 t. [5 F6 ~% M% o! p" u e
if(cin='1') then$ X# N* E" ]5 `' |: o$ c
if(bcd1n=9) then# ? t9 _! Q3 _8 i
bcd1n<="0000";) B, l( A6 `' b& ^$ t2 [4 g
else* z7 u3 j1 N4 X0 F
bcd1n<=bcd1n+'1';" L1 [1 |3 r) v3 z2 H
end if;; O4 h& X) i/ E: ~3 o: y4 A6 z. N
end if;7 U( u. k+ F+ d# W6 e$ A; w# z/ k$ q v
end if;9 n6 f) V% U3 m7 y( s
end process;
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: y& t) F$ b, X( d# P8 N& ` process(clk,bcd10wr,datain) is) ^# B& Z0 ~* ?) j
begin
5 \# ^) R3 T. I& {9 C if(bcd10wr='1') then" _+ Z* V q( \/ H# m3 o
bcd10n<=datain(2 downto 0);
8 p' f6 T) w: Z8 {3 { elsif(clk'event and clk='1') then7 g: O3 v6 H! d9 w' Z" f3 I3 ?1 H
if(cin='1' and bcd1n=9) then
2 c6 P! Z3 ]) B: C if(bcd10n=5) then8 y2 I, w M# J
bcd10n<="000";5 w. w8 @' M* W5 b, _; `% n# Y& P
else
/ |/ R3 x, W; R1 L bcd10n<=bcd10n+'1';
. A, A4 Q$ `3 y& S( ]0 ` end if;4 ~" G2 A+ r; ?8 R
end if; O) S3 a0 G9 E3 m8 u& S8 @6 \
end if;
* E- ?$ ?5 c0 c, a) y9 W; h; m) o end process;- F6 I: I9 ]9 T
8 S8 F! o' Q" M/ \5 [
process(bcd10n,bcd1n,cin) is8 d0 U, x# E4 G$ n* A+ V
begin
+ ^9 {8 d4 b1 Z/ p! B* i if((cin='1') and (bcd1n=9) and (bcd10n=5)) then3 I. V5 z: c/ @) X
co<='1';
6 p$ B( F+ u9 `8 [' m else
. ?. }. D% M4 n$ q0 U0 ^ co<='0';
- _$ u R' T6 h2 N. U end if;
9 ^$ ~% B1 g- M7 | end process;* {8 K( C& O; W# n" v, B
end rtl;
: O5 T: M$ S( P8 m3 S+ v, s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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