|
|
EDA365欢迎您登录!
您需要 登录 才可以下载或查看,没有帐号?注册
x
本帖最后由 wangxia6112 于 2010-6-10 16:00 编辑
2 N/ x: T/ ?% o/ Z/ `
. [/ j# k. i# lFPGA:XC3S100E
/ Y- I4 a' t+ F" t; }EEPROM:25LC640
4 L7 c+ X6 ~4 h& VPROM:XCF02S5 I G& l2 g4 @
0 Z- I+ r' i* B我有个问题,想问有了这三块芯片,如何对EEPROM进行读写操作?
0 ?0 ~5 N. |) R" S) m7 h* j) u& v* j0 [$ U
+ Y5 P+ @+ {3 s! d; R) I
另外,采用的总线是PCI总线。
: b6 o% F0 x5 J( m/ S5 \. }
' ~* Z! H, ?8 | S" w, G- O9 Y
! O6 E: R% O9 w- M请高手指点指点。7 l' G8 \1 ]5 }: x( l4 F
% Z- b8 S) V0 n5 u3 I
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。; n; k( x5 p- u* X) y9 H1 f2 O# f
- 2 `: P* a8 q: h U: ?# k
- 7 U: A/ n; j3 @7 Q3 U# c
复制代码 + m0 g9 Z* Q. t5 J$ G
module cpld(clk10m,rstn,sclk,mosi,miso,ecs,led,mosio,eecs,esclk);
" c: Q( F; m xinput clk10m,rstn;( E2 D% [2 \7 U9 L) }" D
//input iow,ior;
8 G- g4 ]. p$ A& g {input miso;2 f' G- `' d/ R L3 b( w
output sclk,mosi,ecs;
/ ^7 b0 d0 u y' H2 Routput [7:0]led;
8 h1 r0 p2 D4 ?: M+ N( Eoutput mosio,eecs,esclk;
* {0 ?: x; d' V: x$ ]4 `reg [7:0]led;
+ b7 ?8 @1 Q9 F) F, C3 f8 _3 K& v @" b( A
wire clk4m;
' L# @% i/ \. {1 Vreg [20:0]cnt;' e$ s7 q0 l8 H, l
always @(posedge clk10m or negedge rstn)
t/ l/ `1 y3 d4 ]/ T7 Mcnt<=(rstn==0)?0:cnt+1;
1 M; o' G3 Q2 X) I5 r+ X! _0 i# I7 d0 N2 y. b4 Z% o; W" t" Z6 J/ D
assign clk4m=cnt[20];& }9 Y/ d* `; |
reg cs,sck;
" F) Q& ]! J3 E l6 creg [4:0]next_state;5 P/ F1 q3 ]" ^$ e9 f1 q
h8 u: B$ t3 P6 P
parameter idle='d0,
" V. Z( m5 [. @# {6 d, w& \ K N ewen0='d1,ewen1='d2,ewen2='d3,ewen3='d4,ewen4='d5,ewen5='d6,//ewen6='d7,
5 v4 F7 A; _8 K' p+ V6 y
& j3 L9 g$ V9 w write0='d11,write1='d12,write2='d13,write3='d14,//write4='d15,//write5='d16,
* l3 L! n+ z. { * o, D0 k, L; B
read0='d21,read1='d22,read2='d23,read3='d24,read4='d25,read5='d26,read6='d27,read7='d28;//,read8='d29,read9='d30;
; V; p7 Z* z- c7 s$ I& e7 O
7 U; v% Z: _/ v y( k: [6 ]
! `, P9 E& A9 h; q9 A! ~. M
( Y( `' U" [$ s//reg [4:0]cnt0;//write enable counter' @* k0 ~! i L2 S3 c; V
//wire [7:0]wren;//write enable
7 D4 q5 Z# S3 g# W# P7 P8 B//assign wren=8'b00000110;
3 `/ g. O. s6 N; f( S! M5 breg [47:0]sq;
: m4 R9 Y7 u6 k) [6 x: L//wire [7:0]adr;
# i/ j" y, c& L0 `; k! O+ e//wire [7:0]data;+ i! Y3 F9 P N: w+ E1 |
reg [3:0]tmp0;
2 F: F+ [3 | r1 j4 `6 b$ y X& sreg [4:0]tmp1;& }6 S; s6 V- ]) |: N# M+ S) T9 D
reg [4:0]tmp2;
) M% G$ Y$ l2 y; breg [4:0]tmp3;0 x* ^" n% C7 C5 o6 F% C
//reg [1:0]tmp4;
7 u' }- d' n& b3 Yalways @(posedge clk4m or negedge rstn)
- `" r; C- n/ ~! o) u8 b$ pif(!rstn)- D0 @7 ^" {3 W5 X
begin
0 j; ]& n2 ^/ K, u/ s- l* j cs<=1;
2 S* D3 l6 K6 y8 J9 E# r: n2 q sck<=0;
4 k: Y2 }+ i W D sq<='hz;# [9 Q6 s( t% J& _) P
led<=8'b0;
9 T+ N' q3 f% k7 Z0 o' h; g4 }3 dend
3 }# O9 g; v: S# s1 `, _3 Kelse
$ } d: \' @) }, Kcase(next_state)1 d3 W. r) F4 l# s/ T
idle:( z* E4 o* I; v% j$ e
begin
8 v. g2 }6 [( I1 _! w cs<=1;
! e+ K: N2 x) E9 m$ Q2 J sck<=0;+ E9 X# I6 T9 v5 l
//if((iow==0) && (ior==1))//& H) y" e5 k, ^+ A7 h
next_state<=ewen0;7 @) X# k: V" {8 o0 Q
//else if((ior==0) && (iow==1))//
, w& i6 w! v7 u$ M1 S: T8 Z; C U //next_state<=read0;
3 X! E" V8 [6 d/ g end
& z$ p* G9 E1 m: H+ k' E' Q& P
) T' Y0 S* V' e- U1 i( Bewen0:
4 Q% z+ m* L9 q4 {! r! m. j begin
; H2 d+ X( z7 r% e7 i cs<=1;7 b* ?( [5 ^4 z3 B2 Y
sck<=0;/ V- f d, O- V9 B) T6 {0 D o7 Z( B$ N
next_state<=ewen1;+ p4 a+ ?$ Q0 x5 @7 ^- G
end* I3 \2 M& R/ Y( b5 V7 U
ewen1:' l3 ^0 ?4 h" z$ w8 v, n
begin/ c3 H9 q& x2 g4 D5 B# w
cs<=0;
. q J* A5 y! s sck<=0;& O/ _: u' C5 j, j
tmp0<='d8;2 ?" L9 S9 N$ W) \
//tmp1<='d41;
9 D& B- B& H3 w6 p- \8 Q0 N( v6 t sq[47:40]<=8'b00000110;//write enable) O7 H6 X1 q- w/ n* L2 G
sq[39:32]<=8'b00000010;//write$ `; p9 V. y! t! L+ j2 Y6 k$ j$ o
sq[31:24]<=8'b00001111;//eeprom write address, c$ x* V& D. U! g+ z
sq[23:16]<=8'b01011100;//eeprom data- C# u- t; |) m9 U$ H6 A
sq[15:8]<=8'b00000011;//read' {/ l4 {8 G6 U1 P0 D
sq[7:0]<=8'b00001111;//eeprom read address4 }3 f+ f' g, g
: n7 y6 d! h! ] }. Y* m
next_state<=ewen2;/ [ l4 b/ J2 P2 _7 M
end4 K2 ]0 `' y( N) o: K) ?6 g4 B7 | p
ewen2://sck posedge ,wren signal=000001108 J* i2 l9 w9 A7 F9 a& g
begin; N8 R5 y1 H! f$ t5 J
sck<=1;8 C0 L; ~6 K' W: b
tmp0<=tmp0-1;
% u' P3 V9 w% U6 ]$ q& J( X0 [2 d next_state<=ewen3;# Y- f5 w ^% p/ L
end
6 @4 T/ B7 V# l1 newen3:
' u) X5 z4 E0 h+ e# l$ v begin
1 q; Z9 x/ @( \5 _0 k! c3 l sck<=0;+ r1 J- f) w2 x6 L$ X6 _ ~
next_state<=(tmp0==0)?ewen5:ewen4;
9 y; |' y) z s. _ end! G0 a, S; K9 H+ w% p: ^
ewen4:
1 ?9 c, t& j" e& \5 h2 m begin2 ~ T4 P/ X& s7 ^ J z
sck<=1;
7 m7 k: r4 Q& ]. | [% J7 n sq<=sq<<1;
! h! n( x' N$ B: R& v tmp0<=tmp0-1;( W2 d: r+ j; B& b" G* f
next_state<=ewen3;
- v1 @+ `& R) |# y+ X end
- F( H v0 Y! uewen5:
% p6 q; U+ ~8 S: x- Z begin
- N% J% K' F$ M! J$ ~9 o cs<=1;7 r& W$ X" p1 J7 a1 ]
sck<=0;2 A S; o6 A, v- k
next_state<=write0;: Z; B% ?, g+ }' i8 E# [+ E
end2 Q2 m( C: c+ A. G2 D. r
/*ewen6:
6 G3 I- ? j# K begin! o; a: [" @5 X" t2 F
cs<=1;
: W2 W7 f$ @7 \4 I sck<=0;$ Y/ w9 ?: _' \0 L/ s/ l" S! \
next_state<=write0;
2 i% [+ M/ g9 A- B8 S end*/: Q, ~: \/ B; J. U& ?, U
5 ~' l% G6 [3 ^3 N6 V! k1 J
//write( j8 M( X9 G% u
write0:/ B! |8 O* y u6 {0 S, c# _
begin* I- b8 `4 ?8 e* h
cs<=1;9 _: ^! T* \) t! ?- H
sck<=0;
/ u- I5 U3 \- g; C6 Y tmp1<='d28;7 Z' s. S2 l. o( M
next_state<=write1;6 Z) s5 U1 w6 P. U. ?! L
end
$ `1 [& {7 f7 V/ \write1:0 ?8 r% h1 r" p, [: d9 M
begin! C+ r a& b! E: V1 b6 J
cs<=0;
" o0 {/ O4 s5 w% P1 L sck<=0;
1 ~/ r7 M. H }: A9 h tmp1<=tmp1-1;' B6 y# L! u- t8 g. t8 I8 k
next_state<=(tmp1==0)?write3:write2; ?* |, M4 w+ ^% P9 m" Z. V/ Q2 ?
//next_state<=write2;
8 D- I) t. Z T& M9 K end
& ~5 @0 b3 g* Ewrite2:1 x; H' ?3 r, e6 T4 Y! o
begin
( |7 Z3 X2 f1 O' Y/ b* N sck<=1;
- G D0 r6 w% P% V1 y* m sq<=sq<<1;0 u" I! t( b7 K) p
//tmp1<=tmp1-1;
& C$ @3 J/ j3 z2 M% i6 ]9 |; v) T next_state<=write1;( y u5 m; ?. h& }/ U( b
end% D0 R! O9 F* ?8 a7 [$ |; j
write3:
0 D8 P# a+ ~8 M, A7 } \) C* D begin+ @; W4 n& r- A- T8 U: \
cs<=1;
' |$ N3 z& Y# e% m2 _ sck<=0;: v D( m0 M! N# c' m6 H# s( p
next_state<=read0;
. i; y$ j+ B2 u' M end$ x% F9 `. N7 p1 _# a
//end write
6 \' u. D* n' J% T% T& L" B0 u
1 A6 b7 q& [. |read0:% y# m, q+ N: `, i+ k
begin
% A U9 I6 c$ z' J) s cs<=1;
7 }& g4 l* u! s- ~, B sck<=0;, _& ~$ o. N) S2 O( y2 i8 [ V
tmp2<='d20;
+ J3 R: j' A+ I% T+ A. E, V" t next_state<=read1;" E8 n2 J R0 a5 G1 |
end
- }" p$ o2 O/ O( u) E! d6 Hread1:
2 D, @! S$ {% V+ m. c4 |* O' j begin3 n4 t/ G" `6 R9 N
cs<=0;% {! \3 _& ?" m# h7 {+ K
sck<=0;
! ?& F3 S0 n1 A tmp2<=tmp2-1;
c; K p, x3 L# B7 y4 @) H, X //sq<=sq<<1;0 p2 O1 p" x( i( s0 r$ L" u& u
next_state<=(tmp2==0)?read3:read2;8 ~3 P2 ]0 t; i
end
7 O9 K* c* w; N5 F# Hread2:( w% x' B- T) Z$ x
begin2 M8 b5 f* e$ `7 B6 E, c7 P, D
sck<=1;4 I4 m! u' M' S9 k1 a3 Q- E4 _
//tmp2<=tmp2-1;* U& N% Q4 `3 m
sq<=sq<<1;% ]/ K5 h$ |1 X- r; I. ~8 D
next_state<=read1;
9 X& z/ d: m f7 v6 Y end# p. n/ t* h# o6 f, N: \6 V
/*read3:5 F: u* y# f2 _7 i$ W, h9 @
begin
; f; V% L' I7 X" w sck<=0;0 j0 X# n4 C4 ]1 n; A6 y
sq<=0;: K- F/ N+ W7 Y/ {* q
tmp3<=14'd7;% p" X/ _$ G, E% F/ z( k
next_state<=read4;! y; l% _/ m# D
end
9 b$ B8 ~3 o R- @" c4 f* X/ _' Xread4:
- _4 M' q, n' a# |" Q: l9 b" a+ \ begin- Z/ t: |: T+ }& }' A% U
sck<=1;
8 n$ W! }* r% u( n2 g6 x Q5 ^* f. i led<={led,miso};
Z7 r5 d4 d/ y$ f- ]% U/ O4 o$ H tmp3<=tmp3-1;
6 i( R6 y2 { ?& e" R$ F; B next_state<=(tmp3==0)?read6:read5;. }9 p" f r, |8 M/ R
end
( A' X6 p* \$ [; Kread5:9 [4 E$ Y2 C* D$ q
begin
2 Y7 [( c' x! C7 z$ t5 R2 D& P sck<=0;
* ]' G! C d; x2 { next_state<=read4;
3 e6 \+ l' y' I6 k1 }2 ]. c! }! Z end
4 U( x+ S( |4 R5 D- Dread6:
8 l3 V% H5 X+ S2 O. B3 q& s1 L begin5 `- v" |2 c) G* R
sck<=0;6 t6 t" r. I& F& d
tmp4<=2'b10;
9 M$ w1 ?) \" T" I next_state<=read7;+ _' b7 d+ E: y U+ E; L/ }
end. f( P8 Y$ P) O( N: p% P
read7:0 G2 |1 l; y* W
begin; p- f$ y1 _2 \
sck<=1;
9 |" D7 P8 P7 K8 D9 v) M tmp4<=tmp4-1;$ y, x2 q: q' V7 k
next_state<=(tmp4==0)?idle:read6;3 }3 S' O& E. P& k, {
end*/
/ P& f, @# k6 x8 r3 x' d) _$ _ read3:
" c4 i0 u# b, V begin
' H3 t. ]+ U) V3 ]0 ]! P0 c0 \7 ] sck<=0;
& X$ n, ~0 }5 x8 U- w) t tmp3<='d8;# _) G* z$ w9 w5 k( Q' i2 B5 P
next_state<=read4;9 O" P# h% d6 Q/ S Y
end
; V2 K) R7 p0 A% F! K; G read4:* B. p+ ]% \" n" ^+ u1 f6 Z; K+ _
begin3 x, i5 Q+ R# y: h
sck<=1;6 i& ?+ m @9 L- C
//tmp3<=tmp3-1;
7 l3 m$ [; H& m7 D. _+ R led<={led,miso};
7 x+ [# ?7 ^6 s" e2 J, ^9 C, R4 Y next_state<=(tmp3==0)?read6:read5;/ \* g. l8 _9 {7 y0 x: n
end# Q# G+ Q% b- M/ Z9 t
read5:! _# A& g [/ |$ L# O' y* b
begin/ m- R" \# ]9 `
sck<=0;1 S8 h8 U/ A N8 X& ]& E
tmp3<=tmp3-1;/ l! n& {- W( y9 s# S3 m) N
next_state<=read4;
$ E3 ?& p; y, k4 I5 @ end
* K+ k# D4 v. G. q8 G# F- W read6:
# ?$ J$ I3 _6 _) ` begin) H p4 s# ? V# E! N4 Y- W% _
cs<=1;
3 G9 P3 g# l/ A* K sck<=0;* H( ]0 b9 N2 t% T
next_state<=idle;
) C0 ^6 t5 z3 I end
3 e( U# G7 N0 B# v3 Z& Kdefault& M3 f9 q5 C9 G+ n9 l6 J( I
next_state<=idle;
! \+ e* F6 o' O: O8 Qendcase
! v' {5 o6 N& C
# R3 Y8 K# m& u6 x; u6 n6 C% O3 g5 [% h
assign mosi=sq[47]; M0 B6 ~& F1 E# ~* R; A# b
assign sclk=sck;
[2 C8 u8 ~$ ~0 N//assign mosi=si;% Q, Q# l) {3 Q1 d3 @
assign ecs=cs;) _ `& g. i5 A6 O
assign mosio=sq[47];
! [/ ~( |0 i( h% O8 s6 u4 }0 kassign eecs=cs;
/ x+ A8 L( ?6 ^ X6 G" `$ tassign esclk=sck;( y8 ~! j5 G$ r5 W6 F0 z% F: w3 T
endmodule |
|