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本帖最后由 wangxia6112 于 2010-6-10 16:00 编辑 0 e; x( L& d& T5 x5 K+ E
1 J2 V1 x) _/ ~8 \+ {FPGA:XC3S100E" E1 U3 \8 C0 a- Z9 Y
EEPROM:25LC640
/ m% T$ ^7 f0 Q0 u, k4 D% YPROM:XCF02S! f6 U9 \: o7 ?" g# o4 [: n |& u
7 [" l. f6 i. X9 q8 _+ y* S k我有个问题,想问有了这三块芯片,如何对EEPROM进行读写操作?
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另外,采用的总线是PCI总线。
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: V% t0 t1 N" J! M5 t) N请高手指点指点。# z! b" y- n2 V# g* G! |9 k4 [, G
3 U$ e. J& k5 O2 l" J以下是我自己的程序,读到的数据和写入的数据不一致,不知道是哪儿出问题了,麻烦各位帮忙看一下。6 ~3 S8 L( Q4 }& i- k
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复制代码
2 i5 ~" }! s: { mmodule cpld(clk10m,rstn,sclk,mosi,miso,ecs,led,mosio,eecs,esclk);
& ~5 ]8 E$ \3 W; m! ^+ K! sinput clk10m,rstn;. A( m) C. t7 Q2 b: c& W
//input iow,ior;
, N0 y; P4 C' F8 Uinput miso;
$ S: E2 ?1 \% g- @$ W j# Z: {$ ]output sclk,mosi,ecs;
; K. |3 T+ j6 N8 ^output [7:0]led;
% r4 i5 A# t* J' A0 W' R" noutput mosio,eecs,esclk;* Y6 `, Y' `. a; D9 J2 m! T
reg [7:0]led;3 r2 f1 F4 }) O. ~
+ @3 l6 j/ @& r8 c
wire clk4m;
' l. R0 i5 v" {, p. A4 ?( Oreg [20:0]cnt;
' K. b6 Z7 r' C% K* I7 galways @(posedge clk10m or negedge rstn)2 r9 W4 \4 a \8 u) {
cnt<=(rstn==0)?0:cnt+1;* A5 v" @4 ]& I5 @, ]" i* U
* X7 }, B# \+ E8 Lassign clk4m=cnt[20];# z8 L4 k6 r. f9 d, R
reg cs,sck;' Y) _( E8 X+ i/ i! J2 O
reg [4:0]next_state;
, U# z$ N+ M$ Q5 s9 I% m7 ?5 ~. q5 F, I0 r6 R$ F0 q: D
parameter idle='d0,
9 x* K( K4 M2 U. X: c9 ]3 V4 Q/ z+ h ewen0='d1,ewen1='d2,ewen2='d3,ewen3='d4,ewen4='d5,ewen5='d6,//ewen6='d7,2 f. Z0 N) c- G8 p8 O
; d4 I* f, h8 ^1 R& o write0='d11,write1='d12,write2='d13,write3='d14,//write4='d15,//write5='d16,
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read0='d21,read1='d22,read2='d23,read3='d24,read4='d25,read5='d26,read6='d27,read7='d28;//,read8='d29,read9='d30;
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) _( [4 ?5 m2 m4 R3 T9 h! e8 {. B) Y. b H1 }$ k: Y
//reg [4:0]cnt0;//write enable counter
; e5 ]! ]! R* z7 U) f4 y H//wire [7:0]wren;//write enable
! Q) u: W/ y" Z* g% e//assign wren=8'b00000110;7 g" B- i' T, ?/ p, a% J
reg [47:0]sq;
" t+ D* x s; J n4 Z H- o- _//wire [7:0]adr;) C3 s" } N* M1 n; O$ W( D
//wire [7:0]data;
2 `/ t- [+ j; L8 d& G2 y L, mreg [3:0]tmp0;* Q4 j5 z3 L/ c
reg [4:0]tmp1;
; @ ~, U2 C8 Dreg [4:0]tmp2;: a* U8 T+ ]. G+ W& Q
reg [4:0]tmp3;
! h7 A! T+ {8 c( s5 k//reg [1:0]tmp4;
( t' {' }* s- T8 ralways @(posedge clk4m or negedge rstn)
6 j* g+ U0 [ P- _if(!rstn)9 H1 y- d) K! B) Q
begin: ]$ E; Z7 y. K* w) y
cs<=1;/ h6 |4 @! M0 t, j( N
sck<=0;
0 O6 e. U4 c7 v5 c4 V" p4 V' f# Q sq<='hz;9 g3 {9 y2 _' b b! \/ y( K6 T: ~5 h
led<=8'b0;" S: N3 o H' p5 |$ {& r# h
end
0 x( K8 m& s7 }0 g& aelse I: h; h* O% ?
case(next_state)
0 e5 S. o5 g. D2 a% q' uidle:: C2 a1 s7 W* T5 I9 p4 Z( Y# V+ p
begin" t8 N& A" C2 V; r; j7 f
cs<=1;
& u7 |3 y8 n, m# T5 a% @% H sck<=0;( G: n& G( L! J: P# T2 a/ f
//if((iow==0) && (ior==1))//8 ^- t5 ~8 S; v8 ^- d
next_state<=ewen0;
5 ?' j$ F# N( }1 Q% O //else if((ior==0) && (iow==1))//
8 R; Z8 U) ~4 B$ _% j //next_state<=read0;
A! V, M l6 W# B0 E end$ y9 i" ?- C! M
" w d [; X: t: kewen0:- w% n7 {5 |# T: M: S G, p( O5 h
begin( ` u! w3 M9 x f( o
cs<=1;( ?" H' @( o, A3 c
sck<=0;6 E$ f( s0 K; F& v1 U
next_state<=ewen1;
9 v# _7 Z- ]" ?3 Y: E7 R/ V end
$ \" U! x8 A- c5 {1 E3 e) sewen1:$ [2 o+ s3 ~* y& d
begin
3 c M M; U0 [! {; j% Q cs<=0;
) R0 G" R+ _. ~8 P9 ^# n4 T sck<=0;+ j2 e1 Q- D# z; Y+ ~; @* }' T0 ~
tmp0<='d8;) r0 y/ }4 U a8 t: p$ V1 x7 c
//tmp1<='d41;- g, s' U! s; _* V+ V
sq[47:40]<=8'b00000110;//write enable) Q0 o& j5 ^& w/ S" ~1 W
sq[39:32]<=8'b00000010;//write/ U- |# j2 J$ G# L l
sq[31:24]<=8'b00001111;//eeprom write address
2 x7 H$ J- t a/ P5 n2 Z+ v sq[23:16]<=8'b01011100;//eeprom data
k3 g9 ^+ c' L# a sq[15:8]<=8'b00000011;//read1 s0 w. U/ ^( `1 V+ V) i* r9 S7 f
sq[7:0]<=8'b00001111;//eeprom read address
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+ I* ~ U" e( z: `, _ next_state<=ewen2;, W9 a6 z1 e9 J+ y
end
; v, P3 W! A, Y8 [ewen2://sck posedge ,wren signal=00000110
, _, e& q; I' m$ Y8 ~6 P2 S- b) F begin
$ d& s9 \) z( H/ c& ^4 ? sck<=1;
" X- e! N7 S5 v# }: I$ _" { tmp0<=tmp0-1;- r3 d* y1 u' o7 V7 Z
next_state<=ewen3;
A- h2 Q: ]: {/ K" ?+ ]7 ^5 Z+ r& M end
- W6 {0 K9 K' T0 Y! M1 z* rewen3:
; I' E' r8 O! A& v' z; V begin
7 x* g3 a. E$ D sck<=0;2 \" v& D: U/ R
next_state<=(tmp0==0)?ewen5:ewen4;( `8 s, M9 j; M$ ~* I/ N
end n1 Q5 Z" n: t5 z: V& b$ X
ewen4:7 `1 U: q5 w2 i# {) l
begin
, u4 @, Y6 P/ K, x sck<=1;
% D& g; ^9 _8 `% m# b, S sq<=sq<<1;6 i/ {, O' q( P
tmp0<=tmp0-1;
% f+ p$ H" b8 B' W6 ~. N' n- E" g next_state<=ewen3;
, a9 E" O/ w; o' X& } end
1 X" i8 }0 o2 X7 z- e1 \2 Z8 j! d* @ewen5:3 \6 {4 j6 k7 @5 V
begin2 p6 m* w: ~# g7 \; W
cs<=1;4 C! Z/ x! m! f1 l t' ~* M8 e
sck<=0;
% ~: Y2 f B' F& H) h! B; g* A next_state<=write0;
. H# P1 N* q# E* u; J8 m) N, ? end
: M( U' g3 y6 [1 f- ]; V1 b/*ewen6:2 U1 o5 H5 z+ j9 W$ b
begin
" E* M# p" l& Q9 H cs<=1;' I Q8 _ m- i: K
sck<=0;
: E1 a6 y7 z& U+ j% [' H next_state<=write0;
6 R+ f% c' A8 u c, Z6 L end*/
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//write d$ d; B, I0 [1 t
write0:2 M% |8 d* N, P( q- j7 n' ?
begin/ \9 ?1 [% }; q e- C
cs<=1;" }& m$ S: z% d0 o# V2 F
sck<=0;
5 b3 D' o; Q% Z# }6 E% R- _1 \% V1 Q tmp1<='d28;& @( b' P& E9 ?0 D7 s
next_state<=write1;( I& _2 p, T5 W
end. A: q. e. v/ S7 x
write1:) @: m8 A" Q6 {# M
begin+ Z) \/ d7 K' q
cs<=0;
; m4 W) H9 G0 F+ j! { sck<=0;+ j) k- |" s6 ]8 q6 k* i
tmp1<=tmp1-1;3 g Y. R6 o9 Y( n0 |; ^& I6 ^9 {
next_state<=(tmp1==0)?write3:write2;
) |+ F; e! {9 K: P) c' R //next_state<=write2;3 @3 R: A6 `8 e* U
end( @7 z z% Z6 r$ \. F6 n3 I# K
write2:& m& _: L" J% t# d o
begin
& r& @) M/ f+ d, e- r$ L# ^ sck<=1;
: _3 t+ U' E. l8 ^ n3 Z0 C' Z sq<=sq<<1;$ T: o2 D' ]/ F( `1 N
//tmp1<=tmp1-1;+ o. Q# e$ v' J) N
next_state<=write1;: L! W9 r$ `- y7 F ^
end0 G: {3 b1 d5 ?3 F
write3:
0 w# k6 p2 N* R6 @ begin, g6 X# r" {4 _9 _& i7 U7 `8 S+ Q. d/ u
cs<=1;$ W) |% S& Z: F
sck<=0;( `9 m# H' u$ d/ s' _
next_state<=read0;
( g+ j* @% J4 ]% ]5 W. H0 h end
. N" X, A* ]. L8 r//end write
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read0:% N5 n9 |1 k( [9 a F
begin
/ f1 z1 j' Y( u# r* e- D4 Q cs<=1;- c% t% v6 R2 l" G( p
sck<=0;% H9 Q8 k1 b# j A5 f
tmp2<='d20;
5 F& k D' i6 V8 K next_state<=read1;9 X2 Z; \) s( I; U% v) `$ }& B
end8 d9 Z" y/ H6 v* ^* J
read1:: z* u8 D0 |$ ^* u
begin( \4 h5 X* e+ y
cs<=0;
4 j) ^2 ^5 m, }' k& i0 @+ n2 m+ I sck<=0;
0 E5 @& v( Y& w" }+ @7 r tmp2<=tmp2-1;* o! F+ d( {5 Z! C
//sq<=sq<<1;
- g1 g p9 g7 ^+ p" T next_state<=(tmp2==0)?read3:read2;
+ x1 O: X' h- I3 b end' v! ~5 E0 X5 m
read2:1 Q/ z' u* l0 Z- A
begin
# p# Z1 M S/ p) t4 l sck<=1;
/ L; i( G' E; Q8 s //tmp2<=tmp2-1;
% I) m& o8 A1 Z0 W2 D( }$ c6 F sq<=sq<<1;, m, j( i" Y$ S: U
next_state<=read1;
- r/ w" J( U' q, p+ D end
/ {7 _; Z. K6 r/*read3:
1 d% Q, U$ n7 _; }! H" w begin
" ~$ u A& u7 f- c1 } U; W8 | sck<=0;3 a/ l( a0 W5 C9 U, k
sq<=0;$ ~) w! A/ R/ H9 M) J6 y
tmp3<=14'd7;
' Q" h6 T' s% ] next_state<=read4;
* @7 S: D, B$ l& F+ S$ u; [- ] end
1 ?# h0 [( S! bread4:
) S! p6 H( ~( C4 [ begin
* x! T0 ~4 [6 ]3 H5 z% R, l sck<=1;* Z# h" b) d4 s$ l9 p- v$ U
led<={led,miso};
- m9 x% f2 x/ [2 P& e7 Z tmp3<=tmp3-1;
, L) ?5 i; T& r% T% v) x next_state<=(tmp3==0)?read6:read5;
& @7 K6 l9 q3 ~, @ end
4 F, Q! o- R, S' \* o. n# Lread5:/ x: C$ l# k) [8 i1 ~( f6 ^
begin# A1 C) v+ \7 L7 Q: d. M
sck<=0;
8 _ t X9 O* j& T! `; e; B; ~ next_state<=read4;
( W7 W8 M( W5 N+ |5 P end
! } i9 g! u1 W# ~" u8 cread6:
* I* u$ q3 F" v. D begin
" P) @% y1 d0 b! V4 l: f! e sck<=0;* J* w0 _4 A" n3 p3 X! `5 \
tmp4<=2'b10;
6 ^, w& t/ g* X next_state<=read7;
+ i4 b7 [2 D* h4 z end3 E7 {- {0 h5 X9 R9 X
read7:$ ?9 {/ Q# x) `. E c
begin
; i; v l8 z, z* ?1 b sck<=1;
6 G9 X. k" V0 }1 Q6 c- Q4 A$ H7 | tmp4<=tmp4-1; o9 ?5 z% I' {7 y
next_state<=(tmp4==0)?idle:read6;6 X) K; e* `. W6 D& H. t$ Z2 `
end*/9 k% c0 h/ r" j$ h: C, f3 N8 [
read3:5 i+ }5 c7 U: Q& u5 c9 L2 ^
begin1 v# c1 n" r- t: |- `0 u
sck<=0;% V2 w/ C. x' Y5 e! @" b
tmp3<='d8;
' r! N' c% O0 R! e7 g) m next_state<=read4;3 p: f" w6 ~- \$ c" Z0 S
end8 u" N! r: c3 Y! Y4 ]
read4:+ R3 a" s& G7 `8 Y# l) Z9 Y9 ]6 t
begin
- h9 ~/ a' R. ~7 B. W sck<=1;0 q/ `" e% y3 e/ t
//tmp3<=tmp3-1;: Y& j) U! D8 p0 h
led<={led,miso};% b' C' j/ z4 u9 P
next_state<=(tmp3==0)?read6:read5;
1 c3 P) v5 r$ `4 e* A* b A0 W- L end% f$ w0 C* z8 |' a& Y* A
read5:: n5 l; w! v/ v" v4 b* j
begin
4 n4 q! H- H! y; a2 t sck<=0;
6 K* u, _3 K" I! B6 x8 d, C tmp3<=tmp3-1;
$ R8 f7 B" @$ V7 _: l next_state<=read4;' @6 [% Y$ O3 J, }
end5 J) n3 I9 S: M/ d4 ^
read6:
6 e' R: {$ D3 i7 ]- v begin
) A: }" K2 z; A; }) s cs<=1;, d% b6 K" ]3 l. v
sck<=0;
; Z9 z+ T6 H0 F& \0 A next_state<=idle;& t0 q7 B" J8 Z
end
6 P2 }5 K, F- i; adefault$ j6 U- t& l( C
next_state<=idle;
& W5 W/ P T% F- u9 K, w; O$ Gendcase
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assign mosi=sq[47];, a' f% x9 H3 H! O, t* s3 V$ i0 [
assign sclk=sck;
* S$ o9 I9 a8 `//assign mosi=si;. V5 o/ I& f6 `8 q0 b6 r! k
assign ecs=cs;
' \2 X" H2 T& m$ b, kassign mosio=sq[47];
2 X* {( u8 u6 I3 P0 _ nassign eecs=cs;1 S6 X( \' t0 Z7 T7 y
assign esclk=sck;
% W0 n5 d" p- a3 y! h6 }) K4 ^$ {endmodule |
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