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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, q2 `6 Y; K. I B& U/ t
可以告訴我要怎麼改他的data_out動作嗎??
+ `( ^8 Z; Q4 ^1 H$ V$ pmodule abcd(Data_out, stack_empty, stack_full, Data_in, write_to_stack, read_from_stack, clk, rst);1 C1 a: X( O! [0 @9 i
parameter stack_width = 4;
& _5 V- Y- q/ e: g. _parameter stack_height = 8;2 P7 O3 o) a. v% c, b; Y9 u8 P
parameter stack_ptr_width = 3;
; G$ J$ p- t, h2 O# c0 x' O. X0 Y1 ]output [stack_width -1: 0] Data_out;7 F: @& R% @1 G+ z. F* i v/ o
output stack_empty, stack_full;; z) w, `1 H( N- N
input [stack_width -1: 0] Data_in;# g, g; M# O- V- m& p% X, b
input clk, rst;
6 `7 j6 x# i Ninput write_to_stack, read_from_stack;3 C y H7 c8 K2 W
B+ r% |" j/ W; u B% x. ] s- _6 S
reg [stack_ptr_width -1: 0] read_ptr, write_ptr;1 O- C3 D* I- H
reg [stack_ptr_width : 0] ptr_diff;5 I2 q) o0 S6 G: c
6 {' O i9 c. J% B5 S4 Mreg [stack_width -1: 0] Data_out;
/ U2 a6 A1 N5 \1 [" G2 qreg [stack_width -1: 0] stack [stack_height -1 : 0];
q& b$ f9 m2 d9 S9 F8 M4 z5 s- u' K. P( O; t) y. c9 z+ s
assign stack_empty = (ptr_diff == 0) ? 1'b1 : 1'b0;
7 m( w0 O3 j/ B+ c" Hassign stack_full = (ptr_diff == stack_height) ? 1'b1: 1'b0;# a2 { T$ N% t- s% o
4 \* o I$ ^* S; K# Z3 Jalways@(posedge clk or posedge rst)begin:data_transfer6 L+ n, H: R7 t6 L! b# I! b
if (rst)begin
3 }# \$ b G8 `0 i$ u Data_out <= 0;8 N I5 W* b( `9 y4 k
read_ptr <= 0;
0 K' e& z1 ?- i: z write_ptr <= 0;6 U* X+ R/ H* F1 [* r2 D5 I
ptr_diff <= 0;0 n: m$ d( c. _ P3 ~* R& l
end" }: I; G) i$ i2 T6 X4 D
else begin' u) y3 U# Q0 V2 y% K
if((read_from_stack)&&(!stack_empty))begin) T: Z1 Q6 @; S8 L/ o0 }
Data_out <= stack [read_ptr];# w2 o& j" u. c# c. [ e0 S' A
read_ptr <= read_ptr +1;
% [8 O: N0 ]7 ?, H+ ]" [ ptr_diff <= ptr_diff -1;- f/ w3 d! w# z" r+ R" n2 i4 r
end5 q' M; X% h& P9 h, v; `; K) n% f
else if((write_to_stack)&&(!stack_full))begin% l7 a j# f0 `
stack [write_ptr] <= Data_in;
( Z+ h0 X: I# I write_ptr <= write_ptr + 1;" g X% \# F7 |- { m- W) d
ptr_diff <= ptr_diff + 1;5 \4 F5 k+ g! {, Y, L( z
end
$ q$ I( f$ r+ y; E* M" |: E end
k( l. T* u8 m6 b7 n" tend
- G# k& i q, Q% dendmodule |
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