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本帖最后由 wangxia6112 于 2010-6-10 16:00 编辑
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FPGA:XC3S100E
; c+ a, M! R0 b3 X1 z/ L) }( QEEPROM:25LC640
* M% H7 w& P; x8 {2 jPROM:XCF02S
6 c( c/ @* H7 G5 h4 h* s) {
/ g, s- S% {. R- E8 k% A n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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( H2 n% ?! q( Z: t6 q请高手指点指点。: e& I4 y& N5 `4 ~2 N; {, s8 E& G
l5 c7 l& Q! L5 a: p8 A1 T; [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。 b2 C' x2 Y2 A. c5 b/ f
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复制代码
- K$ n( l |8 ?3 _module cpld(clk10m,rstn,sclk,mosi,miso,ecs,led,mosio,eecs,esclk);
. r* p6 [7 {; w" D% Winput clk10m,rstn;( q9 c( d1 t2 M2 S" L9 d& `( _0 [
//input iow,ior;
, y8 V g* o. x# H, minput miso;
, A4 h; t& p9 g- woutput sclk,mosi,ecs;7 q, M; R6 N+ i! W
output [7:0]led;
1 x7 f6 q& ]$ L* u: t$ j) Woutput mosio,eecs,esclk;9 N5 G, ^" z& \! _
reg [7:0]led;
; i) y: p1 u" j# v, j! Y, r
6 ?0 ?8 q$ L. t1 L D8 U8 W$ nwire clk4m;* H! H& Y$ }) u5 _( U
reg [20:0]cnt;; a9 _ y* {( A3 [ R5 b
always @(posedge clk10m or negedge rstn)
, {3 r# Y. I6 I, i- h' scnt<=(rstn==0)?0:cnt+1;
1 F* `" Q, p W. F$ N- C x9 T" ]
assign clk4m=cnt[20];4 Z1 w8 m" p9 h
reg cs,sck;& }) h' d. X- y- E9 m
reg [4:0]next_state;2 E! R Y& ^3 M) J
0 R' L) o6 O4 I3 V+ z( Cparameter idle='d0,
$ ^; T5 G. ~8 q* q5 s ewen0='d1,ewen1='d2,ewen2='d3,ewen3='d4,ewen4='d5,ewen5='d6,//ewen6='d7,
2 h9 O$ L* @; Y) [" p4 j 0 C8 L7 r: g" I% R! d- F0 Y$ [* F) Z
write0='d11,write1='d12,write2='d13,write3='d14,//write4='d15,//write5='d16,8 l2 |& ?! l& W1 e* d* Y
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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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* W# w% ~1 Q2 s% M+ x//reg [4:0]cnt0;//write enable counter; o2 ]7 N& I( z7 u+ A6 o
//wire [7:0]wren;//write enable
: t, s$ ? s' [3 M//assign wren=8'b00000110;
. j% C: B2 T- O+ [. hreg [47:0]sq;: Z4 @4 z) E* P. J# _& l" B3 C' g
//wire [7:0]adr;+ p: Y9 Q! v- D5 G
//wire [7:0]data;% K4 n! c9 w- W9 G6 ]/ k3 j
reg [3:0]tmp0;! w% ]" x; R R, ~
reg [4:0]tmp1;
2 Z- w5 c `3 ~ C- _1 {reg [4:0]tmp2;
5 o" H7 c5 Z! F" v% Preg [4:0]tmp3;8 {/ Z$ c! P! v- j* o3 b
//reg [1:0]tmp4;* Q# v3 q+ w4 w
always @(posedge clk4m or negedge rstn)
* S4 J; C% ]/ Lif(!rstn)
6 v1 d* E' @( w; j+ w1 ?' [# s4 Ubegin
% z6 k2 T2 k4 U( ?: p* s7 H& w cs<=1;
) t, j- E j, b sck<=0;
. N7 u1 M; R! K. b+ p4 P. [; e* n sq<='hz;8 w3 u' v" J$ T5 Q1 [* m7 d
led<=8'b0;' @+ Z0 Z* b! G0 L, J
end
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case(next_state)
% M& z$ y! n* ?idle:
' x7 w; Q( l0 i1 G& T+ T begin
6 T" R1 n/ u9 Z$ G7 x, v cs<=1;& J# M2 f/ T( g# x" s6 F& y
sck<=0;
# k" B0 ]+ A: { //if((iow==0) && (ior==1))/// K! F n" y- ?& P* N! G
next_state<=ewen0;
* i# c0 l; O. A //else if((ior==0) && (iow==1))//
: Y+ ~! W2 K( U+ G9 h6 o( @ B3 N //next_state<=read0;
( [& M r, f1 i9 D6 y% T, V end
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2 \9 P9 P* d% F5 Bewen0: f( C B/ M8 t' I) c. i
begin
# j( r) R. A3 \$ }0 m1 e cs<=1;
$ ~, }4 A2 |/ ]2 r# R p sck<=0;5 {8 Z* [/ a% V6 N# V% Y& F# Z
next_state<=ewen1;3 a3 Q* O3 E# y9 D* ^
end+ @9 \3 q& U8 ^" m; Y5 M9 T) s
ewen1:
- s4 {; i3 F2 E1 B/ w. b j; N* | begin
/ c" t6 c" @. g# E% T- }4 c) f% a cs<=0;
: w( n& d: |. ^! B+ U5 j sck<=0;
/ o- i/ A& h, a4 t: d tmp0<='d8;$ ~( F) C7 n$ R' M( g. J
//tmp1<='d41;
6 N* B3 y2 w. Q1 Y( | sq[47:40]<=8'b00000110;//write enable
4 @! x8 s; E" d# j sq[39:32]<=8'b00000010;//write M* @8 U( u. T# E: T Q8 f
sq[31:24]<=8'b00001111;//eeprom write address, |- T* ^0 c! |1 A7 l1 v; q
sq[23:16]<=8'b01011100;//eeprom data
2 Z. z, ]/ Y4 W y: p4 o8 l. X sq[15:8]<=8'b00000011;//read k/ w0 L/ Z' C) r8 @/ X2 ^# j" Y
sq[7:0]<=8'b00001111;//eeprom read address) Y# a" ~# X+ X$ E, N2 a% w4 _, D
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next_state<=ewen2;
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ewen2://sck posedge ,wren signal=00000110; U8 j5 D4 s+ c6 e& E- ]4 o
begin
( d g. B' ?* W4 G sck<=1;2 N/ ?' E- V$ i: Z; g
tmp0<=tmp0-1;
+ D- o$ u$ K3 k O1 C% n/ f, j next_state<=ewen3;6 \( y( ^2 l6 u! c! Y. s! H
end$ x: i! m' w/ m: M; w
ewen3:' t) |7 m! L7 n" p9 G0 H
begin0 I1 X, i* O. W; e( g, [
sck<=0;
3 A) l' \7 k: Z/ T next_state<=(tmp0==0)?ewen5:ewen4;
' r" f: T: f- Y6 ]! r; z end
; S7 i9 |' z: ~, }: `ewen4:
- y2 P2 ?5 Z& f) q9 P begin5 d$ p8 N6 @) _1 i
sck<=1;3 V3 p+ _4 }+ u- I
sq<=sq<<1;4 Y6 l9 d0 U2 i; n9 G! I5 n
tmp0<=tmp0-1;
% e0 w2 ~ S3 d: q, f4 ~ next_state<=ewen3;% g5 U0 Z( B Y4 d# G) \* ?5 T9 y
end! w; b* G' A; {8 F; j, v
ewen5:3 B; C. B4 P* h9 S3 y
begin
: m* N# y/ S6 P% w7 v+ r cs<=1;
6 ^0 u) [0 K) z( E* B' F sck<=0;2 p; f" a Q' l* [! P+ D
next_state<=write0;
7 {' E8 g. n6 a5 c" | end1 G1 i6 Q8 s9 ^6 E
/*ewen6:
* a* Z, S. [* f( R* e- ^ begin
/ Z5 b) J" t+ m% m0 O# W cs<=1;
* W% s$ }! l+ u# w: X# B sck<=0;; w) D8 Y% _4 H5 t9 H( I. s. l+ J8 k
next_state<=write0;
( e$ T2 w" B0 {' C9 y/ } end*/) A0 l- t+ L0 V: n3 M
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//write
' n: r# z. H$ v2 o. C- Dwrite0:
1 |5 w9 y) n' x. m" A! D' p# E begin
( P s/ G& F8 U/ m cs<=1;
3 P b) k' @, w Y sck<=0;5 H; a8 h B( c" O: b/ M4 {3 D& i) f, L
tmp1<='d28;
8 O& g) @$ j6 B next_state<=write1;
' N# a8 I6 ?; b" H end
3 k5 W8 d: o) b! u7 y/ [write1:7 A2 S& m7 Y- n, X
begin5 X4 }; Y+ } t1 V
cs<=0;- O# w) | N1 c: a8 I$ T
sck<=0;( Z. D$ J' U1 j
tmp1<=tmp1-1;# U- q) F0 a0 ^* s& {8 C
next_state<=(tmp1==0)?write3:write2;
/ `& W/ q8 ?) b1 S3 E //next_state<=write2;
4 {0 r* ?$ q: g' d. X end" {( _* A* x, |) Y& K5 O% A
write2:
1 y. {& _6 u; l9 a" a begin+ K _# K7 P) \0 b' a4 i4 ?0 Z) Y
sck<=1;: Y# `1 G* T2 |
sq<=sq<<1;
+ Z! x4 Q. f2 \ //tmp1<=tmp1-1;, m6 w+ H' U# t4 m: Q3 o
next_state<=write1;
) J. V+ L3 H( y$ j- C) [5 _+ w end
0 X0 c, l- i+ f- y/ g9 ~write3:
: b' C! @0 B" Y7 |) ~' m begin8 K' `/ m& Y! ~4 p
cs<=1;
4 K% T& p \4 l: V) q sck<=0;
! H- [9 Q$ G) C, X9 e next_state<=read0;3 |8 M- e N8 A6 V" F0 q
end
+ |: q1 H% j1 z5 t$ n6 L//end write! i$ t4 R4 s- s( i2 p3 N( ~
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read0:9 o/ p1 X0 }, a% F, }1 D9 C
begin
) r* n7 W# k- O; h* l2 }+ U* R+ V. f cs<=1;
9 q q! K3 b, T( v) T sck<=0;( x- c' A' c3 X6 S2 f
tmp2<='d20; % ~6 ^2 k1 o! ]0 ?, D9 J- c
next_state<=read1;
" ?% c$ Q. h" R) }: z9 ? g end
& c2 C/ b9 E! `, Jread1:
5 ~8 x/ {* G8 f begin5 W/ m. Z* Q) m# }% l/ f& v% n
cs<=0;
1 f' {, ]; A ?% T sck<=0;
5 K& B* D: E& _/ U5 S$ y tmp2<=tmp2-1;* s: D o0 W7 p( E5 M5 y$ K
//sq<=sq<<1;
+ `, Z; s- i' a2 C9 v' z8 f0 @ next_state<=(tmp2==0)?read3:read2;
. r. \! L8 f% {! c0 I/ e# f end
7 ]$ L: ]* v' `; k) n' Wread2:
2 ? p' P8 n, Q/ U" }/ @/ ~ begin' e/ O. x7 h8 d7 T q
sck<=1;
# z1 v" c2 O8 v$ Z- s# w/ H& o) s //tmp2<=tmp2-1;
; I) o4 a v* G; N sq<=sq<<1;
6 L2 _1 U6 a4 U, G$ E" D next_state<=read1;9 M! g; F K' }9 ]
end
& p6 A4 U/ T* x; z, Z5 D& f2 Y/*read3:7 [* N Q2 H6 [# g
begin. a( P" }: t0 r, j
sck<=0;
1 n# w2 N4 q. W+ [+ H' G1 Q sq<=0;- z, A! I% h) i+ i: z$ [& b' W) v& g
tmp3<=14'd7;
4 I& K4 }% u# i) l9 ]. j# a. t+ t next_state<=read4;
' _7 a* `, {9 X$ V1 R end) n. n/ O, h; c! z. I
read4:
$ y. E/ L" k( |. Y+ D7 ~! g$ c begin# ]( i0 j7 Z E/ K' Z
sck<=1;
# b& k; M1 E( q led<={led,miso};6 K4 t- `6 t! x- n/ I: S5 K
tmp3<=tmp3-1;
* R4 i: `: Q3 ?6 Z2 ^6 Z2 ^0 H next_state<=(tmp3==0)?read6:read5;
+ o, l9 w6 t' Z% t end; N1 ~9 W$ q( f( j A! Q
read5:$ @+ |- T; Q) K P* G
begin" N# A' n& T- j$ M
sck<=0;# x+ C$ ^6 D+ ?/ C7 F: V+ D# r5 v4 c
next_state<=read4;3 [9 D) r& [, \+ j0 K
end
" x1 F4 X" f, u' Kread6:2 ]0 S- a& o4 u; ^& n! s R
begin2 a* J" S! j' I" b" X8 N
sck<=0;6 r6 P B6 \9 Q6 Q) t
tmp4<=2'b10;
' C# B% D+ X: W0 [. i next_state<=read7;; {5 [8 S$ e, Z) a; w: U! F
end
) z+ K& G4 D* b1 ~* J6 ]& iread7:& `" u& M5 M/ i* K; J
begin/ U, Y: [% }3 c. K
sck<=1;
, t, o3 z+ v# ^4 ~ tmp4<=tmp4-1;& E9 |' F/ A; Z
next_state<=(tmp4==0)?idle:read6;( W* _% K% r4 W p7 T- k
end*/
n$ J9 s- @) M, o1 ?( f read3:. R( X5 D1 e% d! W
begin
( r5 c, r& f7 Z0 A0 o sck<=0;0 N+ |5 t6 U+ m6 A
tmp3<='d8;
2 Q0 D5 }* z) F, s, C next_state<=read4;
7 v/ W1 `" u* J7 z- M8 v5 V end
3 ]% v+ s c; J: Q4 r- W read4:
: J1 x" w+ ?* Y M; b begin7 y$ R$ k! S/ S
sck<=1;( T! U" c6 \- G- q
//tmp3<=tmp3-1;
! i7 R% P& _# H' @0 N- { led<={led,miso};
. r6 \+ K. L1 ^" K: P8 A next_state<=(tmp3==0)?read6:read5;
; A# L. C+ C8 e: S/ e8 a, C6 r end/ |! T" {9 Z+ l' [
read5:: V1 \# g% y V% c* j* k' `
begin
" c9 \/ l9 s6 F, z. t( D, p; U# Z9 T sck<=0;
5 F7 i5 T g7 V: ?/ R tmp3<=tmp3-1;
+ s- [1 ?' a6 E0 T next_state<=read4;
1 N# g3 ]% ^6 ~5 Q end/ m( x$ H0 X0 r! N
read6:
5 O+ I4 T1 ^3 Y4 T% W' E7 |. D begin* s7 A0 E: e3 E7 c
cs<=1;
6 O& e2 u/ v! B sck<=0;% x5 E4 A( g$ }
next_state<=idle;
$ P& ]. ~$ ?" x& ~4 u end7 f$ Z+ q" r8 R1 [6 [
default+ T9 y' h# g) W8 O1 K7 A2 E
next_state<=idle;8 `& B! w. W4 O/ C0 e
endcase
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; n% P! _( A6 W! o1 [& _% i0 g6 ?/ h uassign mosi=sq[47];0 |, x! O& r6 ?4 l
assign sclk=sck;
* d8 Z0 f( I& z) ]6 R+ P//assign mosi=si;9 C; P- }( g, d7 ~3 ?
assign ecs=cs;
4 k' N, e8 {0 d3 H% Bassign mosio=sq[47];
8 j4 E! ^6 B6 l4 y' \5 Fassign eecs=cs;
+ c3 x& V! @* S& b! kassign esclk=sck;; ?" i' o# f Z
endmodule |
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