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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
* y- J8 m" s# O$ H/ K- X1 H0 h/ ^3 y可以告訴我要怎麼改他的data_out動作嗎??
: I( g6 H J3 W7 hmodule abcd(Data_out, stack_empty, stack_full, Data_in, write_to_stack, read_from_stack, clk, rst);
$ b1 j8 I o' j6 L; nparameter stack_width = 4;' A( |5 A* E% O# k7 n
parameter stack_height = 8;
, n0 C2 Q' b1 J5 t0 c. z* {parameter stack_ptr_width = 3;1 R3 Q7 G3 Q, T) v
output [stack_width -1: 0] Data_out;
% ]; Z9 }( r G: }. G- K& Z# Woutput stack_empty, stack_full;
" M6 R# m5 q4 Vinput [stack_width -1: 0] Data_in;, h* Q/ ?: G; K$ Q$ B9 [1 P
input clk, rst;
. r* l# Y" e2 G0 R; T; Ninput write_to_stack, read_from_stack;
( i: }5 h; p: I* R
* B% |1 o- W0 f6 c; n7 E0 Hreg [stack_ptr_width -1: 0] read_ptr, write_ptr;" F. ]% M9 R+ c( p& v; q+ I( Q
reg [stack_ptr_width : 0] ptr_diff;
* I4 @5 w& w4 z" g K L2 K. M( Z. s+ G
reg [stack_width -1: 0] Data_out;$ S5 T1 |# ` A6 F+ Z6 I) }
reg [stack_width -1: 0] stack [stack_height -1 : 0];# a. V2 ?; Q1 r- b) x @* ~; I
* X0 U! P( }: W& \! t3 @assign stack_empty = (ptr_diff == 0) ? 1'b1 : 1'b0;
' a0 q% A& N. R9 `/ y6 D' `+ Fassign stack_full = (ptr_diff == stack_height) ? 1'b1: 1'b0;
6 s+ O% l, x& ^, ?9 Q; T7 Z
7 y, T7 c2 ~) i; aalways@(posedge clk or posedge rst)begin:data_transfer7 n0 B( w4 E9 E
if (rst)begin
( A3 u8 v; r1 v1 H# I& m. F% v Data_out <= 0;
1 V* s6 x# u. ]& T. L9 H5 I7 f+ L read_ptr <= 0;
9 q9 ^2 L" n$ Q W! K U& | write_ptr <= 0;. l! O2 {. D$ l/ K8 T
ptr_diff <= 0;& A0 O: M" L+ ?# |
end* |5 }3 D/ K# O9 w# N: r
else begin
, W5 t; ~" R( U5 J- h H2 _ if((read_from_stack)&&(!stack_empty))begin) ~/ T/ w( x0 d7 T! z/ L; U% B- J
Data_out <= stack [read_ptr];
# o+ v c$ _6 R9 w' Z+ \9 a read_ptr <= read_ptr +1;
' L8 I# @4 Z8 g( U4 F% o ptr_diff <= ptr_diff -1;1 v# b6 d6 |9 F' t
end- G% x4 z+ K# K& H
else if((write_to_stack)&&(!stack_full))begin) Y5 z! `) |( J; t
stack [write_ptr] <= Data_in;
4 _, q& v* Q5 o6 U write_ptr <= write_ptr + 1;
: n0 y, ]2 P( L7 S ptr_diff <= ptr_diff + 1;
9 ]. J) P3 M! e end
- @& A& |5 y, [9 U' C end
: b$ R- r/ I- Q4 |( r' K/ z6 Xend
/ @" q7 `7 @/ _" g# @. hendmodule |
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