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5#
樓主 |
發表於 2007-12-21 14:01:22
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只看該作者
我現在打了此程式,但是動作不一樣" m: T1 D& J5 H. t' g$ P
可以告訴我要怎麼改他的data_out動作嗎??
; L; E e5 f$ o8 M7 @1 _module abcd(Data_out, stack_empty, stack_full, Data_in, write_to_stack, read_from_stack, clk, rst);4 _8 `9 I3 P. L) s; u, M
parameter stack_width = 4;5 k: m( X( H! R1 d1 j
parameter stack_height = 8;' l8 |% ?3 u3 X/ Z( `; h* L
parameter stack_ptr_width = 3;0 p9 I- k! M6 l8 t/ ]! M
output [stack_width -1: 0] Data_out;
# n) [9 n& `( Q$ loutput stack_empty, stack_full;
8 `6 O. `* M) K6 B0 Kinput [stack_width -1: 0] Data_in;3 `* h3 a& G4 w, \
input clk, rst;1 g/ n0 `# h/ a+ h, @9 M: o
input write_to_stack, read_from_stack;
7 K0 P. z( v; Y4 a' o# X# l
9 `" e, o# Y3 o0 V: Xreg [stack_ptr_width -1: 0] read_ptr, write_ptr;
& ?7 x9 U7 X+ [' q6 C& Qreg [stack_ptr_width : 0] ptr_diff;& z8 Q7 ]0 S- H* r) o5 }2 ~( T
$ K' p! {; i% d8 g8 w3 a
reg [stack_width -1: 0] Data_out;/ C6 E1 t8 `. M# y" l; a1 n K
reg [stack_width -1: 0] stack [stack_height -1 : 0];9 p8 r' m& F# e" a; \1 b8 |
! L1 A% G, Q5 r) Passign stack_empty = (ptr_diff == 0) ? 1'b1 : 1'b0;
$ |% T% P- L% U, s8 \- Wassign stack_full = (ptr_diff == stack_height) ? 1'b1: 1'b0;
0 h$ f, Q# H. T' U; V, }" B4 n1 N: ^% l5 W$ J1 p4 a6 h6 _( ]
always@(posedge clk or posedge rst)begin:data_transfer6 u) P5 \( ]: n* b/ e# C1 L
if (rst)begin, V' p: ~1 g2 d) U* z; m/ c
Data_out <= 0;/ i) ]4 Z$ V* O; d
read_ptr <= 0;
9 H# @% E; b$ a% f' Y S- |& }4 r write_ptr <= 0;
9 V* |- P" n7 ?, J" B) | ptr_diff <= 0;+ `' }. G) ?& h2 @
end
7 `7 B$ b. n4 l' F# h" Felse begin
# B4 ?* B1 L r: o, ] if((read_from_stack)&&(!stack_empty))begin- u+ t! {; q4 m
Data_out <= stack [read_ptr];
1 K& v% ^7 Z6 U; f3 p( S: }; F read_ptr <= read_ptr +1;
5 v o: L4 ^% M ptr_diff <= ptr_diff -1;
& d5 u9 I7 i6 h% v4 k end
7 j, n5 H: m7 [2 r( d else if((write_to_stack)&&(!stack_full))begin& z+ J) W4 U5 e3 H
stack [write_ptr] <= Data_in;, n* {! p6 e Q1 T/ E/ U# `
write_ptr <= write_ptr + 1;# e) a- O6 {9 X$ l% k+ U3 P$ ^
ptr_diff <= ptr_diff + 1;
6 ?( a9 S* n$ ^* A) d! [ end
* g; F8 H+ h4 I# ^1 g8 Q end! L" J* Q% [& t! K3 m/ c/ k1 w) h3 z
end
7 |) R9 `! J; sendmodule |
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