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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
1 s0 }5 r3 }9 Y6 p5 I7 Y可以告訴我要怎麼改他的data_out動作嗎??) j1 z+ _5 P% L
module abcd(Data_out, stack_empty, stack_full, Data_in, write_to_stack, read_from_stack, clk, rst);1 F+ ^* P* ^. }2 ?) h6 H$ V4 T
parameter stack_width = 4;
E) \# f C1 Mparameter stack_height = 8;3 O4 ^4 P6 C# p& n# D6 w1 Q8 Q ^% [* b
parameter stack_ptr_width = 3;
3 U- p0 H1 @! s# G2 E# C. Uoutput [stack_width -1: 0] Data_out;: p; q5 f! p3 }/ v
output stack_empty, stack_full;9 k: w4 r4 Q2 p- F, N
input [stack_width -1: 0] Data_in;8 P) ~7 r, N% Q' }' H
input clk, rst;( O0 c* ?( m1 T3 |) \# s) o* f! V) R
input write_to_stack, read_from_stack;( i$ ]9 K' T% g
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reg [stack_ptr_width -1: 0] read_ptr, write_ptr;& G7 q" E3 a. G% p+ J( j
reg [stack_ptr_width : 0] ptr_diff;2 \" I7 ]& ~6 r% y7 c' z- [$ a
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reg [stack_width -1: 0] Data_out;
/ N2 g$ x: @; T. O8 }: n' n lreg [stack_width -1: 0] stack [stack_height -1 : 0];( k' {1 j) T9 F* G$ A) a/ n
3 m/ h6 Y7 F. y! Kassign stack_empty = (ptr_diff == 0) ? 1'b1 : 1'b0;4 n+ N1 @3 e8 @/ W
assign stack_full = (ptr_diff == stack_height) ? 1'b1: 1'b0;
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always@(posedge clk or posedge rst)begin:data_transfer
: N$ h, X2 c" \7 V& I% M, Pif (rst)begin
- w4 A9 w+ m1 o+ L: c; i Data_out <= 0;5 }1 u5 B9 } ^; j, U$ v
read_ptr <= 0;7 v8 S2 n7 F* P' a0 t) [8 A/ E5 r
write_ptr <= 0;9 I- S5 ]: V. v$ D8 f
ptr_diff <= 0;
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else begin
* [1 J- e: `: Y if((read_from_stack)&&(!stack_empty))begin6 R( B5 i. I- w
Data_out <= stack [read_ptr];
8 E! W6 K4 c8 B9 j3 b9 B0 I$ V! Q read_ptr <= read_ptr +1;" y8 J7 X% G1 v% z
ptr_diff <= ptr_diff -1;
/ c% E& x. ?; o end |' x# w5 G) ?3 P
else if((write_to_stack)&&(!stack_full))begin
+ ]$ @$ Y- L2 V! L( D stack [write_ptr] <= Data_in;
7 W0 u( Z6 b ]6 M Q3 p3 i/ V write_ptr <= write_ptr + 1;( b7 a( o' v. @8 ?1 w1 s4 {
ptr_diff <= ptr_diff + 1;( E) D8 z' L& l9 z2 Q8 l X& V1 L
end
( R$ e! C7 q7 Y. c end4 A; i, W {- r' n9 @/ K3 e
end3 a y3 U/ {6 b! [1 L
endmodule |
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