|
恩~是的~我是要把它除到1HZ因為實驗器材的內部震盪晶體為40MHZ
( H' F" P3 Y* O: j- r) t' W1 A除完1HZ接上計數器這樣~下面是我後來又改的><" 難道精準式除頻有很多種方法做??
3 Y. v/ }2 E9 W, j8 o+ K+ Ventity clk_95 is
9 V3 z3 R# i; f C' }0 T; a Port ( clk40 : in STD_LOGIC;4 O1 {5 Q n0 G6 w+ b
enable : in STD_LOGIC;0 S+ g2 e: E7 e; y3 W
switch : in STD_LOGIC;# v( Q4 P6 J+ v/ ~
a,b,c,d,e,f,g,p : out STD_LOGIC;
! [7 j! k& Z0 Q& }, d SEL : OUT STD_LOGIC_VECTOR (5 DOWNTO 0));
" \6 m! H% Y1 G9 x/ w# }+ v+ Mend clk_95;: @0 T, p2 t- ]7 a- n
1 g3 `1 Q& U4 t h& Barchitecture Behavioral of clk_95 is9 z# T$ h( M: k& J C9 q- V
signal clk1 : STD_LOGIC ;
9 W- t+ u; R1 s4 |' N5 lsignal cnt : STD_LOGIC ;
5 d; j" V1 H9 T- Q9 F3 xsignal x1 : STD_LOGIC_VECTOR ( 3 DOWNTO 0);; t* x2 y! J7 |3 n; z' p0 b
signal x2 : STD_LOGIC_VECTOR ( 3 DOWNTO 0);! |, w7 m# |4 U& ]0 [& [" {
signal count1 : STD_LOGIC_VECTOR (3 DOWNTO 0);
4 m# t0 ~; Z: w4 z8 _* Msignal count2 : STD_LOGIC_VECTOR (3 DOWNTO 0);+ g6 V% N6 `3 _8 m! U' @7 L* j) g
signal y : STD_LOGIC_VECTOR (7 DOWNTO 0);
' u0 o( ~( A! \begin! \1 J }( W, z$ g; f3 r
2 R! v- E2 o y5 g
process(clk40)4 B4 ?* I0 H" e( W% A& X# D+ M
variable cnt:integer range 0 to 39999999;: S* t% w' d$ _$ d- I/ w
begin" n9 c$ I- ~; h' f5 R' A
if clk40'event and clk40='1' then
3 [ ~' Z2 g& i2 @ if cnt<20000000 then
& D! ]' z% u J/ C Y9 E& G cnt:= 0 ;
, E ~* E+ ~/ P2 A) Q else
0 D' u$ [# x- N cnt:= 1 ;' B. x/ v6 a% p9 ~' n" Y
end if;
2 Y) e8 `9 B3 f8 F end if;6 q* I+ Z& G, E2 M! V/ t6 V0 h
end process;2 X$ Q q: B( I4 K! `
clk1<=cnt;
! c! s: C8 H. _+ c" l! f
5 W& r3 I, P) b! o* _+ B. K4 g, S5 M process(clk1)
) t$ R8 @4 V8 f begin
0 |4 L( C/ t: w: F# Q0 ?( b if clk1'event and clk1='1' then
( Q+ f8 {' o- D; I if switch='0' then
$ p! l# p* a0 V4 y+ \0 j count1<=count1 + 1 ;, {# I6 {0 d) l( g: ]* U4 I
if count1="0110" then% d5 d+ Y, B3 @
count1<="0000" ;
$ E' T2 ? d/ _: \/ u# X end if;0 Y! v* I( {3 N& d
else
) p3 U& w: B' p) x1 z9 s* o1 ? count2<=count2 + 1;7 e+ `( ^+ D- `0 U. x" T
if count2="1000" then
2 G+ f6 c+ d; |# t4 d$ U+ ]7 F count2<="0000" ;
n9 b) t. ]: C: P# e end if;
6 L6 l) _( d# C4 @3 N1 [ end if; 5 P& i3 ?3 D" }7 G' j( @
end if;
! d/ ?& @" e/ h$ k end process;% D% i) B1 {, R3 R! d
後面是我自己要接出去的東西~所以我沒PO!! |
|