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是一个关于流水线方式实现的8位全加器
. T2 v( q& p% N0 A% s从书上抄的一个例子:; W) W( J. ^; C3 I1 Y# P0 g" u
module pipeline(cout,sum,ina,inb,cin,clk);
. {# P4 N/ j3 n* p8 z/ x " u3 q7 L. V. Y: x0 L9 u9 i
output [7:0] sum;
4 h8 D p7 `' v" o5 `, Z* G. q+ G output cout; Z; b/ b3 H) D4 _ O
input [7:0] ina;& p/ s- w; o6 k$ g
input [7:0] inb;
) H- J0 l, Q! Q. D" W' [5 K input cin,clk;
. Q6 q8 c6 W1 Z; \8 y reg [7:0] tempa,tempb,sum;0 D5 T- f) O0 P. i
reg tempci,firstco,secondco,thirdco,cout;
: t) |% {1 N7 w3 `) ?9 f! J9 _* | reg [1:0] firsts,thirda,thirdb;$ x' Q3 p) L2 M9 V( ?1 j
reg [3:0] seconda; H9 K8 `& A3 Q5 ]
reg [3:0] secondb;- R" S% n8 B, B
reg [3:0] seconds;
/ V( N* _4 f2 Y reg [5:0] firsta,firstb,thirds;* F8 m# h, ^4 A7 m2 h% w0 c1 u
9 B$ X2 ~* E$ C) ]: Z- j! E
always @(posedge clk)
1 ]. H& L3 W. r6 r begin0 H" o8 o! Q' E5 S! s' X
tempa=ina;
6 u; c" T+ n# ]$ l. I7 ]8 s tempb=inb;* T* r- ?* @: p( p |5 y1 z0 \
tempci=cin;
d# y5 z# q; _, ~' p" q& q$ F end 8 K0 g' a S& c( }. s) L
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always @(posedge clk) ( z' J' n. r( ~! ~9 M8 L
begin
j6 a& k; ]! j1 }# o {firstco,firsts}=tempa[1:0]+tempb[1:0]+tempci;
" g+ r) ?: R2 X firsta=tempa[7:2];
7 K; r* m d( A8 D) z firstb=tempb[7:2];3 m% p& h2 q% }% A
end
3 O+ E( u$ a# e 5 M. o9 v2 F2 W- A; O( {
always @(posedge clk) L4 k5 j2 a1 Z3 H$ v
begin
1 b( y5 k/ D) }; A/ [3 @* x {secondco,seconds}={firsta[1:0]+firstb[1:0]+firstco,firsts};
; G( v8 b% P9 q* ~1 k seconda=firsta[5:2];
1 r2 D) p _8 D( g secondb=firstb[5:2];& Q: H1 ~3 D& x2 l7 z9 {
end. b c k4 J, m& V: Z
/ m1 ?( N$ K8 u8 \ always @(posedge clk) 5 V( j4 N# u" }% i
begin
; b" j6 ?0 g8 j( u( y3 `6 E% ^. d5 a {thirdco,thirds}={seconda[1:0]+secondb[1:0]+secondco,seconds};
- p8 Q: \5 P* K thirda=seconda[3:2];
+ }( v. m) c% d0 e6 b( d thirdb=secondb[3:2];
: |( g7 z6 Z4 }2 ^6 p4 x9 V end1 W' F" o. m$ h+ F) h
5 w) r( X' \' U3 \ always @(posedge clk)
+ G' L& S# N' O5 G. V begin
: F# v+ @: N. t4 K6 h3 ] {cout,sum}={thirda[1:0]+thirdb[1:0]+thirdco,thirds};9 j: c! t( [' J; n- I; y
end3 T, J8 L; m5 p+ h* [' x6 x8 E
$ @2 `- y, f3 @* [$ |( y, w* S
endmodule0 ]8 P5 B& Z- {+ ]( l
自己写了一个激励文件:" E" J: p+ a) F: E) c3 R
`timescale 10ns / 1ns
{! Y, r x, ` t0 K7 hmodule pipeline_tb;; e- I: }0 E5 |/ r
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, {& {, s9 q# \ ~# l //Internal signals declarations:
# P8 l2 `& a. V0 K3 x |. \+ p6 G wire cout;' O* D+ H1 F+ c* h' I$ F* Y
wire [7:0]sum;
6 J7 q! B8 b; T% _1 p% ` reg [7:0]ina;/ f B6 E7 Y8 U$ w% ^; i
reg [7:0]inb;( r* N2 F3 H3 o+ P# I2 L
reg cin;
0 @" f, ?9 Z8 s. T reg clk;
L. j# L# S) f( ` parameter dely=10;. X2 D2 w; W$ Q* q& x2 u2 z
) f. @; H+ P' u( A+ K. { |
# I+ h7 r& f$ K7 |8 W$ w // Unit Under Test port map
$ V7 \* X" n9 F' q, R( |; I* `/ M+ E pipeline UUT (
$ ?) G$ J: Z G4 s: t .cout(cout),
7 ?' e5 [" W/ t% _% x. T! C .sum(sum),
8 W+ q7 b" I* F( o .ina(ina),% ~0 @0 W6 l1 g% K3 c }
.inb(inb),
# |2 R- t `6 j: K4 K4 n6 _: E .cin(cin),
4 ]/ k+ T2 `8 @* k1 f# A2 k9 m .clk(clk)); : l2 H1 F& J( _. U' S5 y) I
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always #(dely/2)clk=~clk;
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initial
5 h* B4 x+ u* A6 _. V begin ) D2 ]6 s' E9 x4 s: i
clk=0;& ^& e3 e: u% [7 |$ t8 C/ g1 t! t3 L
cin=0;4 ], B* D( i, y% d+ f/ V9 M
ina=8'b0;
7 G$ G5 s! u- u inb=8'b0;
! b4 n+ i2 a0 u1 ? #(dely*1000) $finish;
# t4 l$ G% n( M# \3 V- q, R end $ [/ o6 z( l- h7 n. v
) e8 t$ ~2 [- C9 b
always #(10*dely) cin=$random;; S* W$ B, T+ y7 B& `' m- ^
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always #(10*dely) ina=$random;
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Y3 }( R8 H( a. d2 g4 h* Y always #(10*dely) inb=$random; 5 t- ^5 h8 \4 F3 `( F$ b0 ]8 h. j
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initial! |# }$ p; u' T) y- f
$monitor($realtime,,"ps %h %h %h %h %h %h ",cout,sum,ina,inb,cin,clk);
% s4 I/ _0 p* gendmodule3 r% _$ y9 n9 Z! ^
但是仿真出来的波形明显不对啊 |
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