|
EDA365欢迎您!
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
6 { x5 [3 g$ B3 R% j+ i$ s9 S/ D2 n4 b+ e: c0 y
FPGA:XC3S100E4 F9 c* w5 b" B
EEPROM:25LC640
+ Z' G5 N- O& P- f% Z; f& JPROM:XCF02S: i2 K' |0 \0 U8 s" Y* V5 N1 t- w
- m, h$ {2 m0 D8 x2 C# h我有个问题,想问有了这三块芯片,如何对EEPROM进行读写操作?) W8 I: ^7 {+ ^, m. Q4 P
9 I" L; H3 a7 e7 @6 |
o2 L; Z3 m& R6 Z+ e6 ?% m! e! X! ^
另外,采用的总线是PCI总线。7 E! L7 ~0 {4 W
e4 t) T7 `9 ?& l/ }
/ _# l6 H+ z3 u5 W. |请高手指点指点。- w" @* x& I3 N4 }
1 X1 r/ L4 } Z. i9 ~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 d0 ~4 S+ y0 @, q5 A2 Q( s( k/ Z
-
/ l5 d; I" Y! E% ~# ?8 M) [6 Z& i& @ - ! m+ Q+ b1 P, n0 [
复制代码
6 a. Z% }3 L; B. b0 ]2 x& {module cpld(clk10m,rstn,sclk,mosi,miso,ecs,led,mosio,eecs,esclk);; f5 c7 z& O& T3 P; v- {
input clk10m,rstn;2 A" _& P+ s1 Y% T! N
//input iow,ior;1 Q% @7 x9 B% L% n
input miso;8 f- Z7 E( P* T7 A) y/ c- z
output sclk,mosi,ecs;
1 h6 O5 ]: ^8 w3 ~output [7:0]led;
1 ~" b- C& \4 L# T; Y2 {output mosio,eecs,esclk;* z1 |) x4 F/ v- c: {9 e1 W
reg [7:0]led;
M* `' L( S1 j7 i3 r8 O4 c. F( u* _$ G$ P K5 s# K4 a
wire clk4m;& g- k; x' P/ T: A# V
reg [20:0]cnt;% j3 p* _* Z) }1 q$ t* m+ ~ N8 w" F
always @(posedge clk10m or negedge rstn)
: x! o) H% J5 R2 N3 rcnt<=(rstn==0)?0:cnt+1;9 e1 w ~+ N+ \! R- m F
; @' U' Z- F0 Q4 ~+ ?- F6 I
assign clk4m=cnt[20];; b3 ^( g1 ^: W
reg cs,sck;
6 F) j2 O& N& ]reg [4:0]next_state;3 y7 C: C: R% \; Y
! N7 X u' B6 M* e5 q
parameter idle='d0,
( j2 G* I s$ Y1 b+ f( _) a* D4 b/ D ewen0='d1,ewen1='d2,ewen2='d3,ewen3='d4,ewen4='d5,ewen5='d6,//ewen6='d7,
. k& @2 e& |) G7 k a$ ^* _. b% F# {0 j
write0='d11,write1='d12,write2='d13,write3='d14,//write4='d15,//write5='d16,
' q7 S* @) Q6 H% S6 R 2 i/ @" i S: ~( i* e+ @
read0='d21,read1='d22,read2='d23,read3='d24,read4='d25,read5='d26,read6='d27,read7='d28;//,read8='d29,read9='d30;
/ I" _! u% L6 @* t6 x& g
3 y- }) T7 C; H8 @
% V+ w5 l. G& @
0 l+ K* J2 g8 U7 X% g) q//reg [4:0]cnt0;//write enable counter
3 u6 A; \; _+ c2 ~/ j! j//wire [7:0]wren;//write enable! L0 [9 ^) T N4 u
//assign wren=8'b00000110;( J9 s$ m' N) S; L- r
reg [47:0]sq;2 v' m3 A: n) I% w3 ]9 m
//wire [7:0]adr;
( u% N/ B7 |+ z7 p/ x7 z0 f) x1 w//wire [7:0]data;+ N& M P; q5 _9 R' \, H& K
reg [3:0]tmp0;+ a6 S# I5 m$ N6 y% p, q. |4 i
reg [4:0]tmp1;
! Y& K7 ^+ D2 J. b1 l8 ^. ?) S/ lreg [4:0]tmp2;3 D' }( V3 n+ y7 E
reg [4:0]tmp3;
& ~' n& F6 ? x//reg [1:0]tmp4;
% T% u; t$ p! k0 q! G1 \5 Balways @(posedge clk4m or negedge rstn), Y5 [$ S/ a( x9 E" @ s1 z4 R4 Z
if(!rstn)
( ?+ B* C7 m) ^+ d: z9 f6 Dbegin/ N3 O( Q! h2 l9 p& z4 h; S# A
cs<=1;
4 J9 Y% {7 s( j* u sck<=0;0 D# S# m. I+ x8 P3 _
sq<='hz;. ]- F, r* W3 T1 |7 X
led<=8'b0;
; B& [% y8 d5 Q# L4 u4 Hend
7 W# @" H8 B2 J$ N& Selse! {% w/ |2 P) R' f9 P' r
case(next_state), d+ _ }- S; T) X
idle:
& }2 U {# k2 t4 f4 a begin$ a/ N0 a- @8 z+ Q$ w- e% L; p7 T
cs<=1;- |) w' \/ j1 k8 X: M9 c
sck<=0;
3 t& H. J+ p6 F6 [ //if((iow==0) && (ior==1))//
' r) S5 z4 A$ [. B% N# q' w next_state<=ewen0;' e: R- C: N$ S
//else if((ior==0) && (iow==1))//' W' a3 i) {# @. H
//next_state<=read0;! T' ]5 G$ \8 q6 d! I) L
end
3 V, {+ D2 \1 F7 R; L" E& r
# f+ A) h( u5 @2 @! Y# h) `: rewen0:
% u& w Q) Y; V h& I1 B. O2 d- g( R L begin
2 |3 e- ] V' X1 |0 I" E4 m; z cs<=1;
: A$ M3 d/ ?1 y( M) z) S" C sck<=0;/ I$ n2 u. y1 ]3 y6 a& `
next_state<=ewen1;
5 l8 i& z# H& c" C2 R2 C0 X end
* R& R4 d& t4 Cewen1:0 Y D( V( U, B( x
begin$ q: p% \. P- }2 K* v; L& P
cs<=0;# h& f( R- q' l4 k. {$ V5 r, w. Z8 K
sck<=0;
K& k1 N& @: p( P' \ tmp0<='d8;6 r7 D: c8 ]- }- V5 P
//tmp1<='d41;
3 m& Z' O. G: I m- l# `5 o, v sq[47:40]<=8'b00000110;//write enable
+ G) j% W2 B0 ?% p3 D sq[39:32]<=8'b00000010;//write6 C3 d& {* o; S9 n+ _# W2 i
sq[31:24]<=8'b00001111;//eeprom write address; [, U8 p$ t# P4 z
sq[23:16]<=8'b01011100;//eeprom data6 _/ d5 ?; L0 `1 ~) d8 m% [
sq[15:8]<=8'b00000011;//read
! e: i3 E* v- E* I sq[7:0]<=8'b00001111;//eeprom read address' B$ o `- {/ F% a
8 ?( z7 A1 c/ {7 m next_state<=ewen2;
4 k$ U( g/ L8 G: \0 l( h& Z# o! e0 Z end
& y! `* |9 _; R+ M* pewen2://sck posedge ,wren signal=00000110
4 ?& W" q* V, f. N; e begin
/ w3 o: q ~& n$ `) t3 Z6 G sck<=1;
8 n5 c- @# u$ }% |" |: }+ I5 h tmp0<=tmp0-1;# }1 a2 A, s$ V! @$ e. l- F
next_state<=ewen3;
" D) U8 W/ T- V! m) E8 Y end
) r! g: o6 w+ e/ X6 y3 [ Cewen3:, G. e( y& E7 _, H! D) l
begin" [& @0 e- p( t: ?: u
sck<=0;
' l0 @! Y- j- r9 o- N0 G next_state<=(tmp0==0)?ewen5:ewen4;
6 p# \) u/ N5 k# I end V% @0 u+ m9 @ k7 \
ewen4:
! g- u _/ e7 p! S begin
( q) y$ ]( Z& U! N" ] sck<=1;
0 y8 }5 O/ m# m6 h0 m! k sq<=sq<<1;' v2 m& B; x: N; H
tmp0<=tmp0-1;# D# e/ ~3 J. i# O4 [- {' J
next_state<=ewen3;
2 W7 U, `. M0 a0 Y- \ end1 X+ {4 ^5 ^7 t K; u9 \
ewen5:3 ]* g' ^7 j# \
begin5 n$ h1 @# g9 K) m
cs<=1;
5 y: t) X! t9 h; m! D: G3 H0 g! d3 e sck<=0;7 A6 a9 j$ ^* T! x
next_state<=write0;
: U* @8 |# q6 S$ }4 h# N% o4 r" | end
$ o& H1 ]9 ]) F0 X* n/*ewen6:
f; e; G: Z H' A9 f: q begin
0 v: f) b" T7 w/ S; L. l- k cs<=1;/ u0 a3 C; w+ Y. m& I9 B- Y
sck<=0;$ M+ u7 h; A/ w# V/ ~' k
next_state<=write0;) m; R1 u }# f. a/ k, F
end*/
4 P: q" x$ m) d4 Z2 p( K' e) _$ d" Q& l7 s4 O! k) C) A1 x+ o
//write
9 f# g* ^: }0 J; x* Owrite0:( {: w, c6 R1 V5 h, F
begin2 t7 Y0 K$ ~# m1 K
cs<=1;0 U9 _5 ]% g1 `9 q" D! T# ^6 z+ s( e
sck<=0;6 G. e- N7 H+ }! y1 n
tmp1<='d28;
" t- w, K+ a2 J M, B5 l next_state<=write1;1 Z# {( a- }: [9 ]7 F, `; [
end: O8 _4 ^ W# b0 a% @( A
write1:
j g o/ |9 T( ]; X/ Q begin' Z7 \" T; w& k5 g7 f+ w, H
cs<=0;3 I$ G8 p5 K1 w; ]/ g* Z
sck<=0;" K/ q$ _) p# p# V2 Y6 w
tmp1<=tmp1-1;0 A) v% G! ]; Q9 F$ w
next_state<=(tmp1==0)?write3:write2;
) `5 H; t* ]5 [$ p //next_state<=write2;7 i. T6 ~( Y1 R8 C1 Z
end8 c5 d! o }% R# V. t
write2:
( O; N) N6 [" E3 }# K& T. q begin9 Y) f! n1 @0 f4 D0 l8 u# H9 t
sck<=1;
$ r, D& W* \* d% I7 [ Y+ e sq<=sq<<1;
8 B. w3 e8 }$ l4 a9 R+ U //tmp1<=tmp1-1;1 G" E! G* l/ Q8 n% B; k
next_state<=write1;
- A: h" l& B- l+ l' G6 I end& A+ ^& W- C% `+ h
write3:
9 T$ |) g, N( p/ |# P begin
0 A* i, [% w4 O cs<=1;: f; ?8 L1 v9 @" Y7 s2 m
sck<=0;
" e, P% W1 c- ^' C next_state<=read0;# u' `) L# l; N
end. h& F8 ^4 F. l4 ]- }: ?! z% N
//end write1 j. o1 Z8 e: e
* L$ z; a: H+ S$ |! s
read0:& R9 e6 d: T7 K& ~
begin) ~$ V" R" o. E+ d8 D$ u4 X1 F
cs<=1;6 m. Y4 P2 [9 p
sck<=0; R; @6 F* |! s$ _ g1 S
tmp2<='d20;
$ ?" Z7 u0 j/ k$ Q$ {6 ?) X next_state<=read1;) S- k) s- W" i+ M" U+ F, `
end7 A, g' p$ [! V2 k5 y B
read1:
7 p5 y0 D6 o2 z( i1 E9 h$ n z begin3 T: S; k2 C) J9 E) n; n
cs<=0;
- s+ r6 ~4 ], y4 @/ s m sck<=0;/ L/ y- v, [$ {6 S
tmp2<=tmp2-1;* G9 ^ N& Z5 J$ k5 d: i2 k# A
//sq<=sq<<1;% Y& z0 v# J7 n/ h% q3 m
next_state<=(tmp2==0)?read3:read2;
4 ?4 a! M! Z6 J0 y/ k# g end
" d: q2 e& b7 Q/ }read2:
$ X3 A- }0 k z+ ? begin' L3 n; ^- a9 f5 O
sck<=1;
6 Z! l. Y6 O. m! K* R //tmp2<=tmp2-1;3 F) O% b: J% p5 N, c$ g8 |
sq<=sq<<1;) J) f6 k- q) F1 c9 D* x
next_state<=read1;# b7 V/ s0 J. `2 q& @+ ]
end6 w1 T( z* U) \
/*read3:
/ u$ Y7 V( ~/ p7 X begin1 Q; j( M' V, x( _# a3 f( k
sck<=0;
5 t$ j4 _9 f! o1 h1 H( U sq<=0;
! D; `9 U- o! S: y: H8 w tmp3<=14'd7;
' z) ?3 Q( g* ]4 A& D next_state<=read4;
" a3 F+ S8 E$ p9 z# s* [9 L, h end1 N% k: @+ h7 }
read4:
3 j) ? D* Q0 [/ }( K0 [ begin
0 Y, W- M0 m4 g0 ]$ | O( b* H sck<=1;
9 ~ u5 e2 k7 A! {6 @ led<={led,miso};( O: v6 ~# `+ ~3 P9 L
tmp3<=tmp3-1;
% ]8 |, o' ^& A1 K1 H l next_state<=(tmp3==0)?read6:read5;
; ]* v5 b) f$ j) o) d5 g7 [ end1 c# r/ g' k) ?4 x5 a& c n7 A7 \
read5:
4 H/ X2 ?! z$ B1 Q% h' K! D9 m begin
0 M2 O2 V! z, [) u# s- ]- b sck<=0;5 ~- c2 s5 s1 o% o
next_state<=read4;
( H$ v, g, N. I7 D, Z; |* i4 Z end
; N- h4 [/ @7 G& i3 u" C, V+ ~read6:
J. X+ v2 ]' s4 H" D begin( \8 a9 |- ^- r( s% Q3 A% S9 V
sck<=0; e; J, |4 V. D! W0 U S* c
tmp4<=2'b10;6 r' t4 p+ `" a( h# |- W" B* o
next_state<=read7;
1 c4 h) u" Z* }: x7 B end
' | B d9 ?7 oread7:1 n8 s6 |0 w- M+ O
begin2 U0 T3 o* v, ^9 J k' h6 v8 \
sck<=1;
! k {3 P7 F% H# d v tmp4<=tmp4-1;
& \: }( a* W# I: A" Z next_state<=(tmp4==0)?idle:read6;
5 g3 _/ l6 m5 P% @ end*/7 V& z) |9 X- }( [
read3:+ P7 Z1 S; X- \ S! p: J9 X( r8 {
begin
( l" X( L7 A! [ sck<=0;
9 J% l" g t& r% b# ] tmp3<='d8;* x) e( `0 i" k+ i
next_state<=read4;
7 S" Q& D4 | c9 y7 ~ end; \( z! L; g0 X2 `
read4:
2 ~8 s$ a2 k& o; P6 J; b$ o begin* F3 m+ i' I$ l5 Z ]) U$ C
sck<=1;- j* H% u9 h# q7 }. L5 f, U
//tmp3<=tmp3-1;8 a- O# ~8 r/ h; f# w; i
led<={led,miso};3 k+ T' t( D: H% A' s
next_state<=(tmp3==0)?read6:read5;
6 U" i0 O9 g2 f/ G4 y/ V6 ~ end5 S: j4 v* S- V, v
read5:' Q' R9 K4 i0 c% W, [
begin
2 a& G7 ~7 z9 y# Z sck<=0;* C/ l7 u$ S& m2 F; z: e
tmp3<=tmp3-1;. B3 N! J: h6 @2 x8 i+ V L. ?
next_state<=read4;6 s6 s9 B% d5 p0 V0 P% K( T
end9 p/ C( q6 }3 W& _: J
read6:8 m7 a" u/ `( [$ p
begin
. e* B7 t/ H/ _$ ] cs<=1;
6 A& D, A" S( i! I" }# m+ Z sck<=0;8 Y( [4 x5 r' Q; C* e
next_state<=idle;
8 A3 B K, O- w end/ R& |: |, f3 w4 i: V! h1 D
default
8 s5 x- |" _3 v I next_state<=idle;
9 Z/ Q0 M* l6 }- o' @1 o4 yendcase
" w! f' @5 S2 h3 v2 T5 a 9 ~: o9 i5 S& P
_4 Z, o2 @9 o) M4 n Wassign mosi=sq[47];4 a) Y8 S9 y: W
assign sclk=sck;
' W# S3 z8 j2 f; _$ Z8 I& G8 x- G//assign mosi=si;9 K' \# x" R& J: H8 F
assign ecs=cs;7 X. E9 |$ P$ E0 h: Y: u
assign mosio=sq[47];: ]' e9 q$ _ w
assign eecs=cs;
7 p1 M V2 n m# s: ?$ d# qassign esclk=sck;
k' [) c5 ^9 z& N2 R: sendmodule |
|