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本帖最后由 wangxia6112 于 2010-6-10 16:00 编辑
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4 [9 P$ p$ \5 u9 zFPGA:XC3S100E
5 A0 z( \" B3 I# d5 v& }8 dEEPROM:25LC640
4 _7 P5 U/ N# Q. q8 \PROM:XCF02S
( _% j" m6 K& O z: Y
2 n' [2 D6 H( k% ^1 F; e" D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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# ~) G7 k! A8 d$ z( x+ j$ y2 q, [0 l" J
) ?, Y1 @( _# m2 J5 Q' s另外,采用的总线是PCI总线。3 R0 h4 `8 B& ^' Y
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请高手指点指点。
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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。8 ^4 v4 B5 N! v2 m' m" R
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复制代码 8 |8 w! P8 k7 V+ V/ h
module cpld(clk10m,rstn,sclk,mosi,miso,ecs,led,mosio,eecs,esclk);
/ w' f; J* E! ]) Y2 @+ hinput clk10m,rstn;
2 \' h4 s# N2 h//input iow,ior;
2 h. u9 X8 a& Ginput miso;; l$ a7 ^3 e' |" ?1 o8 X& z
output sclk,mosi,ecs;% x3 m3 i* |+ x+ f+ ~6 V
output [7:0]led;; `5 l/ M. T2 i" M2 i" q
output mosio,eecs,esclk;
5 H$ }7 N7 V' o+ vreg [7:0]led;2 V# k# E3 h. {2 t; ^$ V
5 {# F" Z" z9 P% j" r' j7 @7 r: @0 V
wire clk4m;
7 J* U# m5 g2 B; @2 |reg [20:0]cnt;
+ D' s& q+ D8 X8 B. }' Calways @(posedge clk10m or negedge rstn)
, `, e! n B- ]2 E1 C# _9 Mcnt<=(rstn==0)?0:cnt+1;& D4 [8 B4 f4 x
4 _' z& ~+ l/ Gassign clk4m=cnt[20];5 F( J( `5 m4 u% t- A
reg cs,sck;
2 c+ h- U$ v, }( j- P4 ^0 ?reg [4:0]next_state;- L+ d5 J) H4 [$ k/ G0 }: l
1 _4 }. i# ?6 s* d( b# Nparameter idle='d0,
# E4 k* v' y3 c9 o$ B ewen0='d1,ewen1='d2,ewen2='d3,ewen3='d4,ewen4='d5,ewen5='d6,//ewen6='d7,1 N1 E+ w3 A$ J# _6 Y& _: v
& |/ N+ \# X) Q
write0='d11,write1='d12,write2='d13,write3='d14,//write4='d15,//write5='d16,# o( E3 _5 T9 n
1 q8 k" U) ~- b" h2 J read0='d21,read1='d22,read2='d23,read3='d24,read4='d25,read5='d26,read6='d27,read7='d28;//,read8='d29,read9='d30;
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i; y9 t7 G: Q" L# X$ b3 Y//reg [4:0]cnt0;//write enable counter" S( v4 L. }# r" v
//wire [7:0]wren;//write enable
- F5 K8 \3 g ]- E- J% p//assign wren=8'b00000110;
' G2 _3 m9 K' treg [47:0]sq;
7 u/ M! K$ G. L# p//wire [7:0]adr;& D3 F7 b5 A( b. R) }: w3 a# G5 z( a
//wire [7:0]data;% z4 A" G6 ~' n( y
reg [3:0]tmp0;
* G( @# \6 m8 }8 p$ A$ ~reg [4:0]tmp1;
9 ?/ j2 }; x7 q' ]- ~" O8 F$ ^$ X( o4 X' Kreg [4:0]tmp2;5 O0 U8 _0 F4 l3 p0 P5 G
reg [4:0]tmp3;
% V$ d8 A2 Y1 v# |//reg [1:0]tmp4;8 g% q- B1 H! E9 o+ b
always @(posedge clk4m or negedge rstn)
& _9 \* u/ L; nif(!rstn)7 q- J; X. I8 s. m" o0 Z! ~
begin5 G' W, z; u, e6 T/ u4 ?* m! O
cs<=1;
3 O# D, m U) \' l% S- w5 w' F sck<=0;$ s5 M+ r: L- l" h; I, p; s Q
sq<='hz;
& d p, m8 ~6 x a3 n; }/ W0 |6 O led<=8'b0;
4 s! w; a* t$ f# x9 l9 N0 H& lend: V4 W7 I9 F/ x; y
else
' O1 [1 T' ]6 M( D2 Z2 u1 b- bcase(next_state)
# o- L6 C3 \5 J/ nidle:. K- t1 v3 \# ^" ?4 K1 p3 _% x
begin$ @1 U) [: `- Z# x/ i, c1 l
cs<=1;
p7 {) l: b# H' {( z8 i% a* A sck<=0;
+ Z) w. [- a' }* P+ E7 x6 y! N8 p //if((iow==0) && (ior==1))//- T1 Y/ t% Y9 C; S' |
next_state<=ewen0;
# K0 _! |' A, I. p //else if((ior==0) && (iow==1))//
) U( o, Y+ w' t. V //next_state<=read0;
( W4 f9 x* Z; Z) Z0 N& v end
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ewen0:
, c: U/ D# y( x% q begin
3 e6 P: b! o9 N/ [) p cs<=1;- {# M8 A" w- h) A5 r9 R
sck<=0;+ w, O' ]/ M# i0 [0 t* i5 g6 g
next_state<=ewen1;1 R2 x; u* L+ [7 E9 P
end! |, O/ R* M0 H0 C
ewen1:. `+ m) X: V4 z: X, z( U
begin
9 x( _ z- @9 T cs<=0;& N( m H1 o( h, | u" p
sck<=0;2 @/ G) U/ v0 N+ N, l
tmp0<='d8;
" S. K* E/ j# g$ m- c! D //tmp1<='d41;0 n" A- Y+ `9 }% o4 Q" e' }1 P% d. A) l
sq[47:40]<=8'b00000110;//write enable
3 O5 z, J+ Z8 S. t sq[39:32]<=8'b00000010;//write
0 k: m, q1 @) G O sq[31:24]<=8'b00001111;//eeprom write address
/ }, d2 E4 g4 j( ]9 ~. l; z sq[23:16]<=8'b01011100;//eeprom data
, L" g3 d+ S# u G$ c, d+ ~5 S sq[15:8]<=8'b00000011;//read
, o' N) Z! j' @9 h8 f sq[7:0]<=8'b00001111;//eeprom read address1 o* T! G: u- p) c9 Z
2 K1 B8 L7 g2 K# k+ a next_state<=ewen2;% y5 z8 u: {5 e
end
& {8 [' r- R: B0 r: V$ B/ x" }3 Kewen2://sck posedge ,wren signal=00000110
. t- f" w2 g/ m7 c( u begin
: n# n7 d5 K1 K/ ? sck<=1;9 r4 |% d0 u1 r$ ^" a- e2 ?& x
tmp0<=tmp0-1;# Q' v! G# R% Z
next_state<=ewen3;; V+ N+ k/ Z& B* u2 t, y& T
end( u1 A- s" N6 S: ^4 U
ewen3:: N" N; \* A- ^4 \+ ?% V/ ?* ^# a
begin
- j4 h7 O" [* D: z$ } sck<=0;4 k% o, `+ S; h0 r8 H: m
next_state<=(tmp0==0)?ewen5:ewen4;
# ~' Y, M+ G7 Z( B end5 `& C" M3 H% `+ e* j* h
ewen4:
L% z9 {0 x5 Y& \' L: ~ begin
* y+ V- t, G$ e# Y7 ?: T sck<=1;4 P5 j7 A+ P7 h7 V0 E
sq<=sq<<1;
) M! r# B0 M+ y" b. K8 d. ?4 A& m tmp0<=tmp0-1;
+ T$ O$ W' \' a# {8 w- M9 t next_state<=ewen3;
) q8 H* W' X4 z2 ?+ Z end
" x$ Q+ b0 s. o1 s0 M/ ?ewen5:
/ }3 p( I* V6 v& `! w begin
. m @2 c; a1 f, V: Q" v& ` cs<=1;. c- U+ ~- X, u9 h. h
sck<=0;
( ^& o( A% Q/ o j9 H4 e8 N5 A next_state<=write0;
/ i# z3 t: z% s, G2 d! V. m% o end K$ F4 C. p4 U' c9 U% P& p, t+ c8 u5 ?4 e
/*ewen6:' ]1 i* z6 D/ Q
begin
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3 o( K9 I! ~$ R. z/ v7 n. i) ` sck<=0;
- ] l9 p: H* \ next_state<=write0;( c( Y% L: Y6 g3 T; [0 X, F
end*/" E0 u9 `2 Y) [& b. r/ U/ E3 g1 ^
& ]5 y" {) M- b& Y. D//write
) t& x' m( u" S) uwrite0:& S9 u' X1 I4 J" z0 a
begin) s$ H/ c5 B$ z* Q- I% z1 g
cs<=1;. ^: |6 t0 S# H
sck<=0;9 P3 u+ h6 K4 y5 ?. V: ^ E( T
tmp1<='d28;
. t# w/ c, |- z! {/ v2 P next_state<=write1;- ?' E) c- z. M" f* A
end
' \( r5 ~% S l' R" |& pwrite1:
2 y. R0 q; g2 t" L6 O begin( |5 \( ?8 ]9 b, s
cs<=0;' l/ \- e5 P% ^* U4 u# e0 k1 Q U
sck<=0;( L1 T; b# @6 V5 S; J+ E
tmp1<=tmp1-1;
# `3 `% K4 \# N* {, n5 x- { next_state<=(tmp1==0)?write3:write2;0 E& L- w4 a5 y! a; m* W' w; |
//next_state<=write2;
: T; {0 }. G' ]7 w end3 u- ?7 T/ \1 x3 ?# x) G
write2:
! y3 u- l- [- j- C begin
3 d2 t: }7 c" j4 g: q) ` sck<=1;
$ V, y* O. d5 t! [; O4 N sq<=sq<<1;+ p9 v$ ^( ?* k% t+ j; t! R
//tmp1<=tmp1-1;
2 w3 s' ?0 w% l$ q next_state<=write1;
0 o& V. P8 p2 |! P9 N9 A end
! k% Q, `2 h1 lwrite3:
. q' J2 C) {5 F. L8 H! O5 Q+ R begin# `. M' C7 b V3 H& Z
cs<=1;
n$ J3 P, U, G sck<=0;$ S+ p' Y( k6 ]$ Z3 y! O# [; V
next_state<=read0;2 e7 K! p; o2 w( P- y, w7 e
end
* L( L1 _5 ^3 w8 Q$ z) J- t# y//end write
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: u3 E ?% I+ ^ v/ p9 b# wread0:3 Q$ {4 f9 _/ F+ q1 f4 r7 K
begin
7 B; D% I3 N y# |3 z) @5 L cs<=1;+ ^, T i0 \* ?: {% R# k; o
sck<=0;4 B. r) i* N- g. B
tmp2<='d20; 1 t6 _9 M$ F6 B; u2 w& }
next_state<=read1;3 J+ }, p0 o# }% h+ A! b0 x. I2 m6 X9 D
end, X- E! o* ~- x# c3 q
read1:* a8 z' p: _8 |7 c; ]/ H, K: C
begin
. l& U- v/ m1 I4 q/ Q0 ?3 u# \ cs<=0;3 U- W" g, k- O( Z
sck<=0;! v3 t- k2 N+ `: Y7 p
tmp2<=tmp2-1;
& f+ I2 K$ c- r; w9 t //sq<=sq<<1;( k. b2 Z' r+ ?# q1 b
next_state<=(tmp2==0)?read3:read2;2 a7 H* I! y$ r+ m a
end' x2 R, Y# [$ R, h9 b5 g) k w
read2:
' l( l7 |. ` ~# K# w* H1 k- w2 ?! x begin
1 J: [$ `: k; s0 T8 } sck<=1;
0 M: D8 X" [( T" D$ U! e' V //tmp2<=tmp2-1;9 }- F% B) n9 w1 t& u; D7 O
sq<=sq<<1;* I2 I* ]$ A( G6 r
next_state<=read1;
# ~% c/ ~% k4 w/ c9 V$ K) D$ e7 a end# a6 j. C; G! \% e2 }7 A" s; R
/*read3:7 P" x7 }5 C1 T7 J' Q1 p
begin; l1 `3 q! L4 x( J2 u
sck<=0;
$ j( c- s5 \ h% c sq<=0;
2 B) w( u4 ?* X$ D# {" g- S6 s tmp3<=14'd7;
. |- [+ @7 }/ r next_state<=read4;7 t$ q5 s) O( W" J6 G& a7 ]: R6 r
end
# P( C5 R J. C. J6 dread4:
, S: o% N' A- g* m0 e5 c begin# J, }9 P. `* q4 \ o: H, C& N" O- H
sck<=1;! j2 E6 B3 h, J& V5 L3 S
led<={led,miso}; V/ p$ M5 C9 V" c/ R
tmp3<=tmp3-1;9 y8 H5 z) `: U1 X1 h5 D
next_state<=(tmp3==0)?read6:read5;6 C2 h' x* q3 f
end
, K: f& e$ D2 j% k0 \: a5 ~" [read5:
$ w) G( r. D, \# ]. Z1 s begin: ?1 `: m# v6 I5 J8 h" _/ J. h
sck<=0;
2 e2 X7 ^# V8 d next_state<=read4;
. K! A) h' X3 x8 x% k& i end
2 I% [- m+ I, ~7 H9 f) }8 U! Aread6:* q5 B! a) {6 ~! ]- Q6 |0 }" G9 q3 U
begin+ l$ c# Z4 M' @( r) r! e" `5 F
sck<=0;! V5 y8 p: Y5 p+ i% t$ I
tmp4<=2'b10;
5 b" \+ L8 j! B8 |3 |. O ^% X s next_state<=read7;# A: E, R0 t8 @& l& Z
end5 Q8 S. p6 S4 \
read7:# l; }4 C% K) P, K8 P, R
begin
, v6 [7 q# M' ~ P8 g sck<=1;
- i+ H | m P* g tmp4<=tmp4-1;- A0 T: `. A% t T
next_state<=(tmp4==0)?idle:read6;
2 t, R+ ?( a# C9 ^- e end*/6 W1 w" w: h7 ^. K
read3:
" @& x+ N) Q( J9 O2 E$ q% d: V t begin- V5 J9 g; w8 d, U' c8 s0 U
sck<=0;# i9 y9 P7 n8 A! o# d
tmp3<='d8;/ t' _5 j3 p8 x3 G1 \& |5 S
next_state<=read4;
5 @! h7 d1 m8 n+ E end, c# ]6 U; }4 S. a$ x" B& i5 A
read4:
' Z" o4 q( U8 E; L5 ` begin
! `1 d3 o; x- w! _" m2 Y sck<=1;
, O+ E: B2 j6 Z) \4 ~' D //tmp3<=tmp3-1;
+ d7 e9 ?) C' `8 k led<={led,miso};, d( r" T: [1 C q
next_state<=(tmp3==0)?read6:read5;' Q. J, X; ^) e( N, `
end
. {4 m) d2 K. ~0 ` read5:
0 F; T; |9 A& \' G+ ` begin* K9 X* q9 E& v2 g6 R& S- B R
sck<=0;' J' Z( T& N `# }! G2 h6 [: F6 v4 t; t
tmp3<=tmp3-1;
8 Y! J) U6 B U next_state<=read4;: W4 D! i, _0 W8 v/ l, F5 |
end
' g8 o2 w8 e8 S b0 _# k: j read6:
' l; I! y; b) d8 n begin3 L9 a5 N3 t0 l' M6 X
cs<=1;
4 h+ a# V9 x& g6 L sck<=0; X: K. g& O( J
next_state<=idle;# y1 A6 g, E3 s G. a7 c8 B1 y) _
end$ W7 R( P3 l2 k5 [8 B% c" E
default
% F( q \% ?! T7 K+ p# d next_state<=idle;* [. i8 L! c9 d+ E; q- |0 |. h
endcase
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' p5 r$ G _1 y+ m; p# g) |/ Eassign mosi=sq[47];( x5 g! F& K9 e8 D% `4 n; \
assign sclk=sck;. a! \& F3 S, m( |+ }0 @5 [' w8 j
//assign mosi=si;
9 h9 ?; M: ~; r; L# b8 p Aassign ecs=cs;4 I, x' L: e) u0 q9 Z; l% E
assign mosio=sq[47];
0 X& N/ ^; }* C: gassign eecs=cs;
% p, `& H: Z! ~* B/ }assign esclk=sck;
, H! m5 }0 a; i i. n& lendmodule |
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