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發表於 2021-5-26 17:25:02
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2 {, L4 h K& V8 ?! C; l
*-------------------------------------alphabet-------------------------------------*. X. v) O a6 H
% d7 C/ C& o+ N( W* I* {( T4 v
`timescale 1ns / 1ps
% r9 I9 k$ b5 Q! O& ~8 }$ w6 u0 K( o) C' H. O
module alphabet(
+ v6 d/ \) Y! |/ t input RESET,
9 N; `5 c% S0 E& U7 O input Clk,
" V7 [. P* V. n! s& [ input LONG,
^, d" n2 Q" K0 c" L0 E$ p5 H; C input SHORT,
5 A4 g, W$ \$ G0 @( t# u input END_CHAR,
) w/ o* I) \1 x" R output [7:0] LETTER,2 s$ j' s; C4 w- Q! D1 `
output STROBE
& O4 @/ m; B, O4 h );
$ v. B+ R0 ~6 P* V, g+ F+ u 6 `$ w8 B" L% m" N
reg[4:0] STATE, LETTER_REG;! q( i5 U9 M* J# F( i( P" f7 ~
reg STROBE_REG;
! W! ?% J+ z* }6 e9 O& _
5 u9 |% i* @# ]: z4 P4 oassign LETTER = LETTER_REG;
( O0 C& \' l, j/ oassign STROBE = STROBE_REG;$ G& ], k9 Y; E
; }( i5 [9 S/ y6 ?1 H
1 i" r( D. W, \* k& |! s
# }; @7 l$ z+ K G$ W. Y- o+ U3 ^# Rlocalparam
6 c+ z. {7 f8 z, a! z. g INIT = 'h0,
8 ?8 @" Q6 {5 { A = 'h1,
4 }: v N. l3 N B = 'h2,- R# a7 i# V9 L& i. W8 o
C = 'h3,
3 j2 v7 {* J' J( C D = 'h4,/ }- R9 l" p# l9 P
E = 'h5,) G: m& R: [5 N! j
F = 'h6,
6 X" }2 |3 A4 W6 J* E& L G = 'h7,. i$ l0 S; r3 x' D; y5 Y
H = 'h8,9 N# F$ ^3 C( I, K/ s
I = 'h9,
$ I* }$ D0 M# }9 T, p T9 A5 w& F J = 'hA,
! @3 c; {0 Q T. D K = 'hB,) f9 L- @! I3 V
L = 'hC,
; ]; A B0 |) U M = 'hD,
/ \1 ^# G9 o( O4 d0 G# z N = 'hE,
/ G( A& F; D5 _* D2 d" h O = 'hF,
8 e O/ H) Z/ D1 M P = 'h10,3 v. z% I* t8 e6 U! C6 e8 t
Q = 'h11,! _* W( _, ^# L7 E8 g E
R = 'h12,2 F4 [/ s1 {* j
S = 'h13,
! V" F6 r2 \% k' F T = 'h14,
5 A/ n& J. ?$ @( i3 l2 Z0 c U = 'h15,
( _3 E. B+ w3 ? l; r% G, \ V = 'h16,
% i- w$ N6 W" X: o& R% @, m W = 'h17,3 z2 V: Q2 t3 a9 [
X = 'h18,
1 S) d: s' ]. K8 s f& D Y = 'h19,& Y; x+ |/ E t, ?; g3 |- A
Z = 'h1A,* {( p# m4 ^ y4 F- O
DONE = 'h1B;
- r o2 [& {! }) O, E5 V& b9 D0 Z: x/ K* ?% a; i, ~6 x& L
! {3 A: y1 Z) B2 u5 Jalways @ (posedge Clk)0 ^, F. q& P6 `5 d7 [- e$ r
begin0 x. W( F8 Q4 X6 P
if(RESET); O: d, L. G a; m& y
begin* y/ k+ n5 E5 D) J1 q$ \* g/ F
STATE <= INIT;' ~8 _$ N" X# c: d( K6 Z' A
STROBE_REG <= 1'b0;4 t j! H5 }+ S. E5 Z7 q+ X5 i$ \
LETTER_REG <= 5'b00000;5 n$ d# A* r- E4 F
end+ o. z* H5 k0 S: H& y _+ F3 `
else
7 b; h8 ?- ?2 H& E7 K. c begin7 \: P7 X/ n$ o0 `
case(STATE), I/ L; Z; `- L' D
INIT:
$ s; b, ?: o! U8 W" g4 p1 B9 b begin" I% @/ L# s- u- u
STROBE_REG <= 0;. E# _) Q: j+ W; U* i
if(SHORT) STATE<=E;' w4 ?( [' d* F; z f# I
if (LONG) STATE <=T;
" I2 X2 N2 u g- {! j# V end
/ {3 M; A* C/ {0 H2 m- q2 g. R! J& G A:
2 @7 }/ l5 W+ f% A- _# j' L6 w begin7 H3 S! Q$ c% n! B" _# r5 H
if(SHORT) STATE<=R;( T& q1 J1 |) F! H8 u1 O5 a1 @
if (LONG) STATE <=W;
0 Q% x0 q: ?2 D2 k& P8 _# ?- i if(END_CHAR) STATE<=DONE;' H' T# O" V$ z6 H# f
LETTER_REG <= STATE;
, S" Y0 _ D3 | end
. r3 E5 K Y+ }/ [2 @; |) |8 |8 ?+ p B:% ~9 A) F- A* a+ O( x( \2 Z3 s
begin$ o4 C. k, V9 c8 D1 i5 h
if(END_CHAR) STATE<=DONE;
V- y# Y" Z3 q% ~1 ?0 X' K LETTER_REG <= STATE;- \! B9 N/ P# u
end
: s3 A( n* X" v C:1 A9 ^0 o& G' t$ X* t7 j$ h
begin0 J- {/ \. b, O5 i) w I
if(END_CHAR) STATE<=DONE;' k& C% q6 l% R' V5 G) N1 \0 {9 A g! T: e
LETTER_REG <= STATE;1 V. j6 k8 h/ v: K% i
end1 m, }# K) v* y* Y) V3 t
D:; s! ^% s3 ^: V! A+ Z) l( C5 _
begin4 e! c2 D! T D* Q! M& D: U
if(SHORT) STATE<=B;3 k6 g+ \' Q2 s; ^
if (LONG) STATE <=X;
9 S6 d+ `5 e8 r. i/ [ if(END_CHAR) STATE<=DONE;) j& ^$ v& ~& ]# w
LETTER_REG <= STATE;
9 `1 C; o- A+ h7 J# a8 @6 p5 y+ ^ end
$ t* J% C5 T4 w0 O' K% ] E:; a$ r0 S' j" S3 a' X5 [
begin
% ], o6 [$ y( A% W if(SHORT) STATE<=I;
0 [" i% D2 V) b0 v9 m, m" D! `& I if (LONG) STATE <=A;
' i0 ^8 M' K v9 T$ S if(END_CHAR) STATE<=DONE;, ~3 q' _* j: H% Y% Q
LETTER_REG <= STATE;
p: {9 \4 q- {$ P+ i" ~) m/ N& R end
, P/ [1 v4 |, F+ x6 M$ ^9 g9 I4 y F:
5 A( E- U8 C% m9 b: d/ L# h$ f begin
4 w: Z: H' Z* ] {$ d) o1 L if(END_CHAR) STATE<=DONE;, M- R- t. [+ i" G* h' l
LETTER_REG <= STATE;* L5 f$ E' G' f9 H
end
/ X9 R3 j8 H* m4 @, f G:$ u' @7 f# T& t" ]
begin
5 H, x8 q! R. P T/ q! w" F" l if(SHORT) STATE<=Z;- U/ E* [5 `3 L; K6 P
if (LONG) STATE <=Q;
" y& h* G0 J3 e& L+ |& r if(END_CHAR) STATE<=DONE;
) J$ p6 }4 h& F LETTER_REG <= STATE;
2 t" d1 z& K% Q7 [ end# y. G# r6 {& B* C- H( E
H:
6 s/ f) p: M* h) ?$ K- S2 F begin
7 k9 Y/ f6 G* i- n+ W2 F5 u if(END_CHAR) STATE<=DONE;0 R! M0 A$ s, ]/ A e' L; ]
LETTER_REG <= STATE;
) x% T' Q$ W3 c. D0 F. V; i% V2 m end
# A! m% c( s5 B6 J I:4 P: @/ B3 m6 Q, d% s) Z
begin3 q: y' q" N0 Z
if(SHORT) STATE<=S;" x8 `3 Z, _# E% m
if (LONG) STATE <=U;2 q8 n0 q. d, s* R9 e$ X
if(END_CHAR) STATE<=DONE;5 ]0 h0 q* ]/ {: d8 K
LETTER_REG <= STATE;, {, W! M8 |5 d/ I o6 X) v5 A
end4 s7 y2 `+ Z* B1 | I0 Q$ V
J:4 {/ T; ~5 J# g5 B5 k5 |( X
begin
. q: s: |& n, }' X. K, S, [2 g if(END_CHAR) STATE<=DONE;
4 f% a8 ?" l, b* m; t, C7 o$ ~ LETTER_REG <= STATE;( \( E. `" K+ y% Y; b4 g
end
+ g4 @0 {, t* }2 J/ n7 `; v! T$ f K:+ V9 y4 z7 K: l: J, X
begin
# k% l* q$ K" m7 v if(SHORT) STATE<=C;( G$ S8 w v. O0 w! k7 {8 f
if (LONG) STATE <=Y;/ r$ Q" z+ d4 [
if(END_CHAR) STATE<=DONE;) Y" D% p$ ^3 s7 Z2 z: Z: q2 n
LETTER_REG <= STATE;
; O; @+ v9 U/ H$ w end
% H/ s1 Z. d4 H7 K; f% J/ n L:3 Q; Y) Y' s6 _2 w5 T6 m
begin
: r9 p E% L" S" G A2 | if(END_CHAR) STATE<=DONE;
& |* \2 X9 } N0 ^4 x8 l5 @ LETTER_REG <= STATE;
6 D/ w/ m- T; N$ v end$ l" T4 v6 q1 Y" V
M:, }7 n, s) N: `+ u" Q$ W6 G) k
begin
7 g5 D, u' A( e: l if(SHORT) STATE<=G;
+ m- r( G% U1 }* R% o0 P+ ]' O, S if (LONG) STATE <=O;0 b. B/ P% l/ j# e
if(END_CHAR) STATE<=DONE;
3 N& L% ?0 c8 o) C8 d LETTER_REG <= STATE;
# z% ]$ ?$ }: S5 \+ e+ K6 ]& U; y end) \7 ^2 F, R$ f2 X- i+ L
N:
" ]- F7 l! S% { begin
& D0 q$ Q' w, ~ if(SHORT) STATE<=D;
$ L$ J) H8 i( Z3 m if (LONG) STATE <=K;
+ n4 w5 ~6 N" J5 F4 v, R if(END_CHAR) STATE<=DONE;
9 K" J- T. V8 J! S. [ LETTER_REG <= STATE;+ c8 m9 e2 b' R9 p9 n" Z
end% ?8 P( w# Y' V z( X2 X; P( r
O:. P V+ I3 B2 l" k. d
begin
* O/ p$ \# X3 z) w3 \6 q9 u if(END_CHAR) STATE<=DONE;
/ K( D; _/ J- }8 | LETTER_REG <= STATE;
( N [: G. {% ^; _: p. ?% t8 {; |0 s end! _" S( _ _/ h2 j" X
P:1 R7 n- i0 N) ]8 d% _6 H
begin, o2 d/ Q. L! |; r/ ]: g
if(END_CHAR) STATE<=DONE;
# {: r7 e# T. y& n$ z4 g/ @% W u LETTER_REG <= STATE;
0 z9 d5 ^$ [5 Y% J- U end2 w) D6 q% s$ D% Q6 W2 c5 ]- T
Q:# [. h# N) ]$ U1 t; j* A
begin, w6 l. {3 L2 Z
if(END_CHAR) STATE<=DONE;
! R8 A0 X/ A, a+ { LETTER_REG <= STATE;
5 G: E$ s- M! P S1 K( z/ O end
6 [" v5 X, v6 C" e& ]# O/ Q* d4 } R:9 f) ? P. J: q; b
begin
, U8 S" D2 I; {8 ]( k if(SHORT) STATE<=L;/ W( m0 B- F! n9 N
if(END_CHAR) STATE<=DONE;# ~8 ^! v, q8 m0 ~
LETTER_REG <= STATE;, `/ o0 R! D6 j1 T
end
2 T% p1 N" Z3 K/ t; w) f( g, I" R+ v: ~ S:
: P0 F8 J2 N5 r1 v: ? begin C$ u8 y& M s$ h
if(SHORT) STATE<=H;
% @, m% \/ } G7 J, ` if (LONG) STATE <=V;1 o+ @1 \) @2 Q/ O |- l3 Z: Y
if(END_CHAR) STATE<=DONE;( n& J$ y& K7 y' D6 s
LETTER_REG <= STATE;
& ^7 A& B% p6 j! p# j" m/ T1 y end1 E- `# X/ g J) ^& }
T:
# [6 x/ `9 r6 b. U begin
; M: U# Y$ C: h: w5 g5 [* q if(SHORT) STATE<=N;0 P: _; Y' Y7 p
if (LONG) STATE <=M;
7 ]% @7 I6 e3 [5 F3 z if(END_CHAR) STATE<=DONE;
( N/ Y1 o3 P( g+ H; J; V) _9 v LETTER_REG <= STATE;
8 v4 f. r1 |/ e3 Z+ d0 j' `* X% | end
& L" R& m: i6 Y, U, }3 C' g/ K/ Z1 ] U:7 [2 }$ }+ O% V7 o, e
begin
0 Y" J7 d0 z4 d8 `$ e( N if(SHORT) STATE<=F;) ?5 D$ z" j% t9 l$ x! L2 L% \2 j) _7 ~
if(END_CHAR) STATE<=DONE;
) t+ Q# k9 E9 x) D1 E& O LETTER_REG <= STATE;$ r) q' d- p# e1 W: C
end2 _# b1 i- o8 r2 u7 m
V:
4 j/ j9 J& r2 E3 b) K+ C% y begin- F; b% Z) I4 [2 T
if(END_CHAR) STATE<=DONE;; v: b w9 }; s: w' l
LETTER_REG <= STATE;% D: d9 v# l/ L( n
end9 s' Z4 i& N! W1 k
W:
. l7 l# N: Q* T- m4 r; c1 D- c+ t9 e begin) r" p9 T- b7 {8 X! G
if(SHORT) STATE<=P;
* V2 D/ `7 t7 [6 i5 K if (LONG) STATE <=J;
: r T9 x; o0 P1 A2 h if(END_CHAR) STATE<=DONE;
9 Z7 l4 x9 [' Q LETTER_REG <= STATE;
0 h% J. \# ]3 e end3 C# a% S2 D! C% N8 w O$ q: u
X:1 p- d+ K$ G! k! b1 [* U$ K s% ~( j! [
begin
9 ]. W. n& r5 ?$ \3 c9 y if(END_CHAR) STATE<=DONE;
, B( L2 S7 B4 J# S2 D LETTER_REG <= STATE;
4 n3 `1 x9 B6 y) Y3 o end
8 K/ J$ a: L8 D! l) X t6 J" R/ v Y:
" G; C/ g( k8 c begin8 V$ N1 w3 d' V& u. J$ y# H
if(END_CHAR) STATE<=DONE;
( f( C8 j& p/ C& r! R LETTER_REG <= STATE;" @) H, O4 W: `8 z
end1 t8 o, D: |8 O* Z& j& q7 {! r; y1 {
Z:3 p8 p) I1 K' `$ O- m
begin
" j/ R( r5 Q7 E' x if(END_CHAR) STATE<=DONE;
/ r' u5 Q9 p$ o" j! i' V2 o5 A* L LETTER_REG <= STATE;
+ M& e4 v. J- t end! [2 l2 V7 K" G1 M6 i" d
DONE: STROBE_REG <= 1'b1;( s& H% `. W$ p5 G6 K7 r* Y
default: STATE <= 5'bXXXXX;
7 Q# `+ c% X% R1 Z L endcase2 Z5 s( g1 z" w, h- m
end/ I: i8 s7 j/ b# P. O
end( x3 d4 x2 l+ }# q+ R
5 ]/ m; T( d U! U- ]endmodule
7 W8 M# V; [! b# Q5 _, `' ~4 T |
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