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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
, A6 k/ ?7 B) `) I可以告訴我要怎麼改他的data_out動作嗎??
* `4 i* l! _7 [' J9 Q8 O& i% bmodule abcd(Data_out, stack_empty, stack_full, Data_in, write_to_stack, read_from_stack, clk, rst);3 b* g$ V; t' d! l5 T
parameter stack_width = 4;
6 n) p0 ~* W. D2 }) e7 J( pparameter stack_height = 8;3 E! K- r- z: z B& l
parameter stack_ptr_width = 3;
/ v+ P( j* e; P% H9 zoutput [stack_width -1: 0] Data_out;
. j; v& H5 c1 h8 m/ z) y- W4 Noutput stack_empty, stack_full; X6 _' R8 _4 E2 h; x$ I+ U
input [stack_width -1: 0] Data_in;* @1 ]% _4 `3 O) j9 A! i! E6 B1 T+ ^
input clk, rst;" k. P. ~5 a+ L7 g& p4 x6 ]
input write_to_stack, read_from_stack;. [/ }* l2 c& ^
1 c9 {& K9 [& E; Z9 `
reg [stack_ptr_width -1: 0] read_ptr, write_ptr;
* P3 N/ t7 P: f# ?reg [stack_ptr_width : 0] ptr_diff;
) Z) y: u L$ w( @% B$ C" ^; k7 n! e0 H
reg [stack_width -1: 0] Data_out;# `3 }3 p2 A0 R8 w
reg [stack_width -1: 0] stack [stack_height -1 : 0];
4 i; R% E, P: Y" u" \) V: B
. l* b, C0 W4 c; jassign stack_empty = (ptr_diff == 0) ? 1'b1 : 1'b0;1 D% f* G0 i+ Z
assign stack_full = (ptr_diff == stack_height) ? 1'b1: 1'b0;3 v: ~; H/ i7 \3 o# S! }
4 A8 g% y0 ?- z' _always@(posedge clk or posedge rst)begin:data_transfer
7 w4 F6 L9 B: ]* p$ w2 b/ eif (rst)begin1 n3 ~! w: ]0 f1 O* u0 k7 s6 n' \
Data_out <= 0;, v! m/ N0 m% r6 d8 s' q
read_ptr <= 0;& M6 W5 V1 w: f& L2 s4 X
write_ptr <= 0;
( g- ~% G8 @. u# b ptr_diff <= 0;
7 @- d% w5 D A n5 kend
1 J( E* V* w) p+ {: f* L J0 w9 zelse begin& ^9 d* _. n6 @/ b X
if((read_from_stack)&&(!stack_empty))begin2 E, ^3 X F- }0 ]
Data_out <= stack [read_ptr];7 r3 N- k8 k8 K; g( ]" t
read_ptr <= read_ptr +1;5 \% y( v3 _7 _* B+ `+ H; D* w
ptr_diff <= ptr_diff -1;* T% m9 ]6 q: }3 V+ r6 E$ H% ?
end
3 k; z$ d" F) \! v* W1 t% x" \4 E else if((write_to_stack)&&(!stack_full))begin0 f) H _5 z; B3 Y- R
stack [write_ptr] <= Data_in;3 l1 z1 Y8 L% Z5 x
write_ptr <= write_ptr + 1;
$ n a4 q# `2 ~) w/ D ptr_diff <= ptr_diff + 1;
2 k7 J% E/ w9 e. D# n4 ^+ e, k2 d end
5 P! j, p! L' }' ]' y% o" Q end; P( V$ D* ~5 s8 @6 [6 U9 g# f2 j0 d
end$ J ^6 T8 O7 E9 n5 X+ l
endmodule |
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