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本帖最后由 wangxia6112 于 2010-6-10 16:00 编辑
$ V- ~& o4 H& c: ]5 k! P& H: p/ C# N/ l
FPGA:XC3S100E
) \: @) K' k( W9 T- pEEPROM:25LC640
/ o: L g5 a* B0 jPROM:XCF02S2 Y% o- ?) [& m) l
1 U2 {2 S, f9 Q# c3 D8 p我有个问题,想问有了这三块芯片,如何对EEPROM进行读写操作?7 m* @7 O5 o5 e3 {0 ~$ L/ R$ S( ^
% G% o) |# T9 H' }$ z
+ \% c4 v4 `5 {, o r另外,采用的总线是PCI总线。- B3 m" y4 N* J+ D& b
8 \; x. f- F5 j/ s+ E. ?
! Y7 U+ j5 c r请高手指点指点。5 s% x9 w G q( o
* N, y' R4 V- m) I9 w0 L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 ~& y( j3 i( m. ^/ X; @9 A. g k
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复制代码 ! f. X( N, \5 P& P# w: L" ~
module cpld(clk10m,rstn,sclk,mosi,miso,ecs,led,mosio,eecs,esclk);
3 F- t+ E7 S5 ^4 u& Y2 `. linput clk10m,rstn;
7 l0 S* A5 \5 L9 r5 q1 |& U3 ^//input iow,ior;' o9 J! f; ]( i9 P" R. {$ J: ^( i* }
input miso;1 _6 O/ b$ J' m3 H5 |0 e6 p
output sclk,mosi,ecs;8 A' e, `* ^* B% ^; }
output [7:0]led;9 B6 L2 g8 b1 K5 w
output mosio,eecs,esclk;
# F! R$ R: V' d+ |; t/ W' sreg [7:0]led;
0 J) e2 C% L6 C8 P
+ [. v0 w$ {' E1 B+ }wire clk4m;0 F. X) y! F: K9 R- z
reg [20:0]cnt;- R) |% p0 G( ?" ~, x% Q/ w: V9 T
always @(posedge clk10m or negedge rstn)+ q5 x- s) [6 i9 I
cnt<=(rstn==0)?0:cnt+1;
/ m8 t. y$ g) |/ j n; L' q
; R$ h9 v0 U/ s8 e6 U C S- {5 Vassign clk4m=cnt[20];' V C$ ]/ Z1 H6 @2 _
reg cs,sck;
7 V$ v& G- _8 D. ?- Z; Z& Yreg [4:0]next_state;+ k1 L8 K8 w' z$ H- U
3 i1 P" Y4 e3 V, k% E3 {1 Xparameter idle='d0,6 w: u/ p4 o+ J5 H5 p) P
ewen0='d1,ewen1='d2,ewen2='d3,ewen3='d4,ewen4='d5,ewen5='d6,//ewen6='d7,
& ^" o n3 i* X- O& F8 X
2 M$ {. M9 \/ M& R2 s/ d write0='d11,write1='d12,write2='d13,write3='d14,//write4='d15,//write5='d16,
- E [3 K- v( O8 Y, p& L+ H 8 B" p: ]' m; M% A3 i" U1 T2 d
read0='d21,read1='d22,read2='d23,read3='d24,read4='d25,read5='d26,read6='d27,read7='d28;//,read8='d29,read9='d30;5 V" k: K0 V+ Y! n
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( F; Z& j' X5 |
0 T$ D" Z" |6 y l4 s( B6 ]0 d//reg [4:0]cnt0;//write enable counter7 b1 }: P: C- D- j! c
//wire [7:0]wren;//write enable
* K o# ^2 @/ N//assign wren=8'b00000110;' a! W; x4 {0 M& I% |
reg [47:0]sq;
+ K# |- ? x8 u5 @/ H0 c/ m3 ]& V6 f//wire [7:0]adr;
* t, q) H/ s& X( l. Q- m1 J5 _( q//wire [7:0]data;
( f, R) ?% l, P. C4 Lreg [3:0]tmp0;: r: y% Q& g2 ~' u
reg [4:0]tmp1;$ Q1 g3 y# i& Q5 n
reg [4:0]tmp2;' _% j+ o" Q: H' h- ]
reg [4:0]tmp3;& s5 x# j/ L# ~
//reg [1:0]tmp4;
/ I) W# K* F5 u0 x. w% k+ ~( \: \always @(posedge clk4m or negedge rstn)7 d4 |" l. ~, c5 R, S
if(!rstn)
7 r+ ^* F0 \' T1 N: J* J4 l- T/ }begin0 }1 [" z, E! z4 y% `$ U$ x5 b
cs<=1;/ O! v- @" ~8 S9 L* s- k5 ^) C1 m" w
sck<=0;
- f( h6 ^$ `+ E1 e sq<='hz;/ o; e+ H% I: b# j* c' t* W9 ]
led<=8'b0;8 ~! B" Q$ c! g0 d6 j! D6 [, e
end
4 A' j4 D: U- m$ E# Telse1 }1 n* \. u; R
case(next_state)
& @- K' d7 d6 a( bidle:
7 [) Z, Y; d9 ~$ l' @3 f2 v begin
1 U9 x" q* C _0 d3 g9 o cs<=1;
2 ^$ B; c5 Q# M6 H+ J! y1 m sck<=0;
" I! w3 }, ], q: W' a* H //if((iow==0) && (ior==1))//; c5 w0 ?' e4 \1 y( K% y0 O- a
next_state<=ewen0;5 [" d" K4 N2 E5 q1 t
//else if((ior==0) && (iow==1))//1 B5 i; ]' d+ T5 g' V" c
//next_state<=read0;
& j/ L* b9 C. H1 `3 R9 P end
( w6 O6 v* e: ^5 n+ f$ |) V
7 F: t a" j9 v K" @0 mewen0:) e# d* {/ X# R \- q3 K; f
begin
( K. z1 L. R( e* ] cs<=1;( r% {+ y0 W* v$ Q7 @
sck<=0;
; Y# @0 C, ]8 z1 U next_state<=ewen1;
" {0 \, O3 L, f) ]* ` end! ], \2 }2 p( g, F* K* H& _
ewen1:
" q' d4 k9 n* g8 h: Y2 Q$ ~1 c# L begin
, u2 L( w& `4 ~8 i6 S6 s cs<=0;7 L: ~# h7 q+ a e! n9 c
sck<=0;
1 {' y* T. R: a3 Y/ G1 e tmp0<='d8;
% J$ p- [/ Y3 H+ T" h( k# o1 ?0 ?2 \: l //tmp1<='d41;
" w, M" Q, R' `( Q, u" T sq[47:40]<=8'b00000110;//write enable3 q% i" x( X1 P" V
sq[39:32]<=8'b00000010;//write( R. a: m* c3 q, d! p- P
sq[31:24]<=8'b00001111;//eeprom write address* s, E. B7 S7 x _7 h- ^) L
sq[23:16]<=8'b01011100;//eeprom data
/ V4 z+ u8 n6 D% I8 e) y sq[15:8]<=8'b00000011;//read' D8 d& V/ t3 y
sq[7:0]<=8'b00001111;//eeprom read address
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next_state<=ewen2;
0 Y1 J5 v# h/ h end2 e! N4 S. P3 i: k- l
ewen2://sck posedge ,wren signal=00000110
. `8 i6 h/ x2 v( R' P begin2 _4 H3 N. j) k+ Q
sck<=1;
6 S+ t- g& R4 a7 N6 o$ d tmp0<=tmp0-1;6 A7 P2 \! D3 e$ c7 Y X" V
next_state<=ewen3;
/ F; J% p$ ~$ Q8 a% w6 x! F end
: J, Y# r7 u& h+ Iewen3:
% o8 b* X |5 E, a begin
* S! F3 W+ g1 h* `. b sck<=0;3 O* K' N) Y8 {* I) p) U' F6 w: W
next_state<=(tmp0==0)?ewen5:ewen4;- Y1 n& b5 @7 [: }7 g, p# S
end
) P* l l8 k5 [ewen4:
! H0 C7 K# J. m0 C4 U! J: F; a begin2 f& U- _# e% `% C2 |
sck<=1;
) [( z+ t) C# @7 R' I* J sq<=sq<<1;, e2 t- N5 ]/ Z5 q3 p3 @
tmp0<=tmp0-1;6 u2 k+ Y1 D, Z9 K1 q( t
next_state<=ewen3;
9 V( [( m3 A) b& }& s. i end, d( {$ h" c' a3 v7 G
ewen5:" U5 F( I6 \& c0 v1 ?/ V% U
begin
, K/ B1 j1 @) I9 E cs<=1;" h6 ?7 M6 v& F; y w4 e
sck<=0;0 R) @. h1 c" ]
next_state<=write0;
- x' L" R! ^5 z {% H. x end
5 b0 Q2 H7 }, R; z: C/*ewen6:
3 v4 _$ ^& C5 P4 P0 b9 J0 V begin x( \/ t- ^: }, ?. F* d
cs<=1;
?$ y; e; N# B) e) c+ b4 g sck<=0;
& ?- A% D# T* W next_state<=write0;
7 H. j# f$ Y; ~$ ]9 h, W end*/
& o. l, N: a& C' z
4 B, Y3 n" R! s, D//write8 m+ C% ]6 d4 [: I! u3 D8 F
write0:9 ^3 n, }- g5 Z4 [5 n" T
begin1 u1 f6 S) l' B: [! n
cs<=1;
0 W1 A1 ~1 J! j+ l sck<=0;( \& n& E$ y0 P; [: u
tmp1<='d28;9 z' N2 p" E+ U
next_state<=write1;0 W( B$ u+ X9 h' @ R
end3 K! w: v4 W* ?, o6 ]9 Q7 ]
write1:
) f) E& c: m( u) W; t0 ~9 L9 w begin
- [3 k+ y5 a2 o cs<=0;* ]4 ]! h' A; a4 _8 g) q: f; N6 r
sck<=0;1 r/ O2 O7 k: E6 ^
tmp1<=tmp1-1;
0 r0 k N5 \0 r1 E& q' m next_state<=(tmp1==0)?write3:write2;
3 I$ r' a9 E. q2 j //next_state<=write2;
' L) x( R" V N7 E end
( a# V5 @5 m) Awrite2:
0 K3 V9 ], b% f; `0 V begin. ?( ^2 C, t( e7 J% I# K) @% Y, X
sck<=1;
& ^3 Y. z) S' M, p9 \ sq<=sq<<1;* q' ^+ V* {7 u- C* x
//tmp1<=tmp1-1;
3 K& T, K! p$ ^" p8 I. b6 ` next_state<=write1;3 s* c9 {, ]. A+ K5 ?+ w8 Z
end1 L5 E$ N6 ~- R# P w) e
write3:
, m4 u2 M2 V( s8 H/ R begin
! W! L/ v6 @& U P& Q. L cs<=1;4 Y% o( i1 `& \) p" D! f% V
sck<=0;- R* F/ [3 V! ?) V" s! w! R. K
next_state<=read0;
+ n* v5 b; T0 K4 X+ u- c4 n end& K! Z" Z$ ~+ B5 k: ? ?6 s, @
//end write) h3 S5 L: I; u2 f6 k9 @
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read0:
! z+ ^2 }/ L: u8 C: p0 f) f5 w5 l$ }! t begin
6 X" Z) f! b! F' [4 s cs<=1;
% f( T( D* f, w, O0 V% u sck<=0;* D+ ` o. m: T8 O
tmp2<='d20;
3 z5 q" P j3 A: t+ O3 J" z next_state<=read1;
m& v2 r! t% _. j9 y) W/ c end2 s% a0 D1 c* _; f- U
read1:! w$ g ` N8 F/ J6 [, [
begin& I" ]' Y9 W4 v+ b
cs<=0;
- s8 g: Q( [9 x8 L2 x- ^% N! N8 O sck<=0;3 O6 V( I+ ?/ K% f; V) @
tmp2<=tmp2-1;4 @; W, L; w* W. R+ j/ N& Q
//sq<=sq<<1;
3 E+ J# m- u- p3 {3 r2 O1 \ next_state<=(tmp2==0)?read3:read2;
3 P; f2 j" g( S. p2 Q% J end
' X$ a; V. l- z* Iread2:
1 @) o" }) L1 a2 C0 o0 x begin
) w4 H8 r' g; V4 \ sck<=1;
$ V9 n5 d" r# P% G { //tmp2<=tmp2-1;
0 d5 _4 H$ |8 E" y- ^6 Y- i sq<=sq<<1;
8 }9 Y9 V& }8 A) O next_state<=read1;
5 z7 l) C6 v5 x( H) B7 U B# M4 s end
/ y8 E. O- X5 K J1 |$ F# f4 N/*read3:
$ |* y& s2 S7 p: G$ C6 j begin4 Z0 y r" X/ |& t
sck<=0;$ {- H; ]$ a8 T; I' z, X
sq<=0;
, U! d' g5 Y! ]2 [5 A' T# _ tmp3<=14'd7;
+ t& _) M; t3 }& P$ o next_state<=read4;
4 V/ l/ q9 n3 ~5 x7 T$ i end
7 ?/ t+ h* ]* q0 }" wread4:
; ^% A2 }, a6 h j1 J: b- h begin5 K+ A# F$ { d
sck<=1;5 j- o6 j2 \5 H5 W( s* L! a
led<={led,miso};
1 G6 J2 q# m; S: E4 Y3 f, P# g tmp3<=tmp3-1;9 m1 n" n& e, @5 x2 {
next_state<=(tmp3==0)?read6:read5;- z: ~; q" M l: `
end0 m; O9 s- v2 C) Q; J1 i4 S
read5:" ^6 \$ J+ u G( M, I6 V
begin6 k3 ^6 l7 a+ M) E. h- ?! \: b
sck<=0;0 f, x P, t6 W9 i$ b9 y5 G
next_state<=read4;
; i# C- Y# M# F3 L7 V/ c& v end2 p" F: s' g; p' A
read6:& F' e# q& e0 d" ?. A: r5 Y
begin
/ k# B/ Z. a$ ~. x& F) O( z9 A sck<=0;' ]7 s7 [5 {3 y9 x$ y
tmp4<=2'b10;
+ b, l9 e. ^6 h( s: t0 q1 }3 ] next_state<=read7;( G" z, l, r& v( X( k/ ~. l
end1 M8 F v% v/ s! [
read7:6 y* E$ K6 M( t: P
begin: i O+ v# k. ^6 t9 d" B
sck<=1;
5 @+ Z* a8 H& ?/ R tmp4<=tmp4-1;
# R0 h& \. `' `& [5 G4 |! q next_state<=(tmp4==0)?idle:read6;" g o1 e: Z! D; f/ p, s* U
end*/
; y. ]0 Q9 x% ^( E6 X$ h read3:, n/ s2 `; E4 s' G) a( a
begin
3 m& L" U4 j) d( F sck<=0;9 _ j; S, e7 L; y& M% o: m3 o
tmp3<='d8;3 S9 M5 v; h+ N _0 ^3 K
next_state<=read4;
2 J6 H6 U" ~0 }/ k; e end2 s) H1 l' b' V# _
read4:
! r1 Z2 {) Q' o$ q begin
% C$ |( M( J$ T3 ?6 I! g sck<=1;
( S! |2 d4 g6 U, E' R2 U //tmp3<=tmp3-1;7 Y4 t7 a* H/ ?, ?
led<={led,miso};
! }& y& g( E1 c3 E% ` next_state<=(tmp3==0)?read6:read5;/ C h* U$ [& Y( q
end+ ^! F V j, a2 a4 L% w. Z# ?, y0 a
read5:( @2 _; v( { e9 c( {
begin
m; o# T9 m6 h r6 W% l" @! n9 i sck<=0;! o" S+ ?* f i. e6 _' q+ C
tmp3<=tmp3-1;8 Y3 G" [# I7 |/ H7 b
next_state<=read4;1 p/ p7 o0 |' v3 t x/ ]5 b& A/ E
end) n1 Y5 i' S; x- W% k# a
read6:4 w4 N- R6 R/ I: B9 ~- Y
begin
% g- l1 h" a e4 ^0 B3 f0 {" c cs<=1;% s- v/ B) L/ U* V3 w; R
sck<=0;0 n0 s7 s1 q! `2 W. k j6 `4 @
next_state<=idle;
- v2 b+ `3 J* l0 T end
8 u6 h& g- ^4 `% X5 K9 Vdefault0 h" Q0 T0 Z& w4 C5 b; ?+ P
next_state<=idle;! O3 f/ k7 f9 m
endcase 6 c4 o. {; n$ [1 X8 ~' ?
# {! s2 N4 v9 T' G1 `8 \# s
. A7 t# n: C8 E5 x$ _: [assign mosi=sq[47];
+ g' }' l/ D K# @5 iassign sclk=sck;
/ O2 N3 Y0 k4 C' t. r3 o//assign mosi=si;
# R7 b6 d; {0 d- Vassign ecs=cs;
" x% r2 Y& w: {( H0 {) ]8 Iassign mosio=sq[47];3 G' W/ ], n+ w' R2 V" q0 V
assign eecs=cs;7 \& F& ?. {6 @
assign esclk=sck;
2 S" o+ K) ?( w* s: V1 _endmodule |
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