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是一个关于流水线方式实现的8位全加器
: _' R& p/ I1 K, A, {8 d5 H从书上抄的一个例子:
" E( z# ^+ [7 B" R) `+ [module pipeline(cout,sum,ina,inb,cin,clk);1 G0 s m* ~% b0 [& h, Y6 x
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output [7:0] sum;
. Y- b+ t9 o B4 f: V output cout;
! |4 T1 s* J* ~6 \9 g {/ ^6 b input [7:0] ina;0 q/ E. i0 @% \8 }5 F4 [ ]0 w
input [7:0] inb;7 W) x. k! N& a( I, H$ b: `
input cin,clk;/ T$ q y/ r/ [ x
reg [7:0] tempa,tempb,sum;& |0 \# O# I: F- X
reg tempci,firstco,secondco,thirdco,cout;
/ ^, F$ b1 N& y) E( Y B reg [1:0] firsts,thirda,thirdb;
$ t* v; R) V- B reg [3:0] seconda;
; {7 R& }; O3 _ reg [3:0] secondb;
. { I7 V2 T) x1 _1 i5 c8 r reg [3:0] seconds; G! X$ w% a* @2 I7 q
reg [5:0] firsta,firstb,thirds; G# F; u9 ~/ Z% W5 m5 }/ V9 A
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always @(posedge clk)
) w! `; S4 D" e* {! p0 V begin
% O9 n) t' U) f- a. X tempa=ina;0 J8 Q/ f$ Z. H- u# m2 [7 l/ L
tempb=inb;
, A/ T! X P7 E7 Z5 Q c tempci=cin;; Z" s# V' r( y( y! a. P
end . d0 u0 t( U+ F; P0 @6 U
* E) ^% Z" T. T" x3 f always @(posedge clk)
4 H) T Y m+ k5 W) ` begin
. n; c+ A. n- P. Z0 L {firstco,firsts}=tempa[1:0]+tempb[1:0]+tempci;
- I6 i3 Z+ ` L% E firsta=tempa[7:2];5 a, q! s% I+ w) B
firstb=tempb[7:2];+ F, ?% c3 o9 g0 {3 [
end ' ^6 W$ U: f# ^! ~: e
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always @(posedge clk) . I. ~$ O8 A8 v% }4 [! e
begin
" O. ^+ l1 R: Q {secondco,seconds}={firsta[1:0]+firstb[1:0]+firstco,firsts};! U' J4 v1 r" I4 `9 S
seconda=firsta[5:2];
/ q. U! M# e8 w! g6 w secondb=firstb[5:2];
" p) C z# @. E3 Y# n# G end
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always @(posedge clk)
' O& F% ~% c) H' p, C begin 9 l4 m2 G# p6 E, A. m1 Q
{thirdco,thirds}={seconda[1:0]+secondb[1:0]+secondco,seconds};
& n. z! Z C: h& c thirda=seconda[3:2];: ~" o( {2 H4 Z: V# O
thirdb=secondb[3:2];1 `$ X/ Q- m( G* _4 z6 |8 q& h
end
, g' {# s% r, \
& ^( A5 o' t2 s) ~ always @(posedge clk)
8 s8 r& |9 b4 o: g begin 0 i5 z* z6 O/ @
{cout,sum}={thirda[1:0]+thirdb[1:0]+thirdco,thirds};
8 M2 \3 y- o# \8 t. z8 ^ end! R, d9 [8 P4 }; m
" m6 [7 y; M2 x9 Vendmodule2 K0 j4 h" v6 p5 C: Z( k) u8 N
自己写了一个激励文件:& d8 a8 B" d8 S6 h8 ^# }, n- _: e
`timescale 10ns / 1ns
9 E/ X2 o0 p+ Xmodule pipeline_tb;" L6 P. ^' a! _- h) V0 x/ ]4 H
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; S# ?& ~1 B+ C/ ~2 U //Internal signals declarations:8 L" }( c8 a$ T7 }. J1 t
wire cout;/ K0 [0 D# W( W& M' M" E
wire [7:0]sum;
- M! E' i. ^0 [ reg [7:0]ina;: M2 U1 Y, M: M" e" q% E
reg [7:0]inb;
: [7 T* P+ M5 t9 U4 u* z reg cin;% A' O+ y' u4 M
reg clk;. S6 E' o0 O2 }& ?9 I3 x2 r. D
parameter dely=10; H6 J% Q* _, [& d: a
X. y/ }" p" H, p
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// Unit Under Test port map2 }0 c- G$ \; E8 C8 U
pipeline UUT ( U. o; M, w& ~0 b
.cout(cout),
- a. O1 ]! ^# I! h2 H% t, Y; L. N .sum(sum),& g) `9 d2 b7 x3 j
.ina(ina),1 r# w" a( Y, {9 M
.inb(inb),8 z& n2 V2 X1 M3 R3 z
.cin(cin), j1 ~3 {5 Z% R! j
.clk(clk)); + r/ U1 W. O5 s6 g
! W. f, [3 x7 H3 L4 u# g- {
always #(dely/2)clk=~clk; " c) }. O/ n- q2 C8 N& w1 F0 U
1 S& y! B$ g, g/ W initial
9 J, O; m4 L4 B3 B% {9 Z! P. v begin
; T+ w. g5 r8 K( @# w clk=0;
! X$ y7 J6 b3 D cin=0;
$ ?1 B3 T2 o' C1 o0 }9 c, M ina=8'b0;- s& Z2 c0 Z5 u; u. {! m- y
inb=8'b0;; b/ q2 S9 y! n! g* d+ _# ]
#(dely*1000) $finish;7 w3 T) q' m; T5 j& g$ N* d
end / J; X4 o& r6 Z: @ i3 \
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always #(10*dely) cin=$random;
$ `# t/ g- O/ S6 K
( [) X2 E; @& |; ~! V always #(10*dely) ina=$random; ) Z0 G! L$ Q6 K4 k% U3 c. D
# i$ t3 r5 w, S# _ always #(10*dely) inb=$random; 1 U- f8 H x! g$ _' O- r, Y
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initial2 l8 Y" ~. H) h$ X
$monitor($realtime,,"ps %h %h %h %h %h %h ",cout,sum,ina,inb,cin,clk);
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但是仿真出来的波形明显不对啊 |
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