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是一个关于流水线方式实现的8位全加器, u. u( m8 t; v. H
从书上抄的一个例子:
/ V3 j8 q( f5 x+ E. kmodule pipeline(cout,sum,ina,inb,cin,clk);( I% n1 f# b8 ~
+ m, i' Y, F- S( F+ e3 T' ]8 ]8 w
output [7:0] sum;
+ k- Z# D* p, W" b1 f( D1 U output cout;% A/ z i! F) Q9 s1 r3 s/ K' X6 g
input [7:0] ina;
- W" O; k& m- W+ z1 J4 @ input [7:0] inb;1 D1 c. c6 c) C, e2 t2 q, u
input cin,clk;
- p8 {2 F! v5 |4 F" m* K g6 k reg [7:0] tempa,tempb,sum;: B X8 @! w5 w2 i$ ~' q ?% m/ t: G5 f
reg tempci,firstco,secondco,thirdco,cout;
! @* M }3 @! {- w' d( v/ U reg [1:0] firsts,thirda,thirdb;
' y( Q# E" k3 h4 R/ L reg [3:0] seconda;, w& |; k+ ~: a% L9 Z9 Y
reg [3:0] secondb;1 V2 X; r! I$ g6 K% S/ I
reg [3:0] seconds;0 Z9 \. P0 P; [9 i
reg [5:0] firsta,firstb,thirds;
2 M" }; h% H' r7 a$ C3 o" C
; L0 T% T1 i( D8 D8 O6 g/ d always @(posedge clk)
- V) ^3 q! |6 C! C: v% Q/ k3 g0 Y begin4 H$ E1 _' O; Q: i% \# K) ]& L
tempa=ina;
3 N/ Y, x3 r+ l' O! C3 ~3 O3 q tempb=inb;# Y0 H$ z# [$ Y. d
tempci=cin;
, g$ A N$ b& z" B% {2 z) J end
! E& Z' ~- n. O5 _3 f & F2 `; o, I: J6 b& I
always @(posedge clk)
8 D- G$ u4 p0 I* x# K# @& l1 g begin 7 X8 f4 Y. e9 X1 s
{firstco,firsts}=tempa[1:0]+tempb[1:0]+tempci;
# F: ?2 e. V* q2 t- K' W firsta=tempa[7:2];' I1 F: T1 _' |+ G4 s- l9 v9 e
firstb=tempb[7:2];
5 x. R, v5 i, t6 l2 ^, F end & `5 Q+ b( ?# `% _: `/ E
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always @(posedge clk)
8 }' C4 E3 J: _2 m2 T+ t begin, D, s0 u3 ^$ y5 o# ]+ c: V
{secondco,seconds}={firsta[1:0]+firstb[1:0]+firstco,firsts}; v1 J: B) p7 |9 B
seconda=firsta[5:2];2 ~ d1 i7 K9 S! R( e2 `
secondb=firstb[5:2];9 ^2 Y1 h( \' J% ~; L8 i
end9 I9 e( j% |- s+ p. _
3 K+ i' G7 X9 c5 _/ w6 K ] always @(posedge clk) ) u9 x" P3 K* }6 G' _8 I, o8 \
begin
2 `8 z2 l1 f% L: r' x$ L8 w {thirdco,thirds}={seconda[1:0]+secondb[1:0]+secondco,seconds};+ ~" q" M) n* ^" c- i7 u, h
thirda=seconda[3:2];
Q3 p7 D4 H) \- b thirdb=secondb[3:2];6 ^# g7 N4 r' B+ X( z
end4 H& K# u4 }6 ~% r: l$ m
) z( S7 J2 R3 N/ W: {9 t& q always @(posedge clk) + [% H' g& J) N) ]6 y/ \9 O& q! b
begin , L8 f: s6 ~6 P4 b0 \+ Z1 ~
{cout,sum}={thirda[1:0]+thirdb[1:0]+thirdco,thirds};
4 x% L: C' ?; X K+ x end5 i" _. h( k% l% M4 p
& h+ K5 K" l7 S8 h# z) r5 a" ?
endmodule
2 O# b) p. @ a) `. `2 d6 z, \自己写了一个激励文件:" _9 {% [ ?5 R$ A X- p" N3 l
`timescale 10ns / 1ns: C# B) j: ^* V$ `0 l! y# C
module pipeline_tb;! z2 z/ `3 B: k3 b" j: ^2 d
0 J8 N$ A# I) ]' d
$ j+ I3 v5 y; I/ N0 h6 f //Internal signals declarations:
( v1 H& n" U0 F2 L# { wire cout;
! m& {: p6 x+ C; p9 V7 Q wire [7:0]sum;) {3 k( \/ j& o6 p
reg [7:0]ina;+ P. O0 t1 R+ u! Z5 n* f# l5 R
reg [7:0]inb;
" L. m( k2 o9 P+ `: Q reg cin;' @: c" K! ?. _6 I7 b
reg clk;" M4 |- h" O$ \$ E
parameter dely=10;
/ H- m. q) X: @, n
5 Y1 _9 K% d5 p/ B- H 0 p: U5 E$ z- u3 I( Q$ O
// Unit Under Test port map
4 ~/ R b, w- P0 t' ~; B: W pipeline UUT (3 \9 J- O5 k& @' j/ \) C
.cout(cout),$ O7 |' s2 D' _) s9 a
.sum(sum),# ?0 _& z4 }& W5 t. [ `
.ina(ina),
' e/ l6 [; P! F. ]& a .inb(inb),6 G+ b! x8 ?; }6 \
.cin(cin),
4 w9 j: _$ z* w& U7 o4 R7 m( p0 H .clk(clk));
: D5 C$ u- h" m& e/ G# X
" R0 y G1 G; }2 M8 B' ] ] always #(dely/2)clk=~clk; ( u, H ~# }: W9 t$ W, ~# ^
! ]& r" G7 B4 r7 k4 H, f
initial
" f4 m. V- m. t! _6 D begin
) Y& u4 g1 _8 E0 Z, a: p+ _# S5 J clk=0;
- V5 \0 U7 P; K8 f5 Y cin=0;" _2 H2 }7 C7 p- X5 h( H6 k$ D
ina=8'b0;
, f5 Z! u" X8 L$ T: Q) E. a5 Q inb=8'b0;# [: ~. b. V' H. k
#(dely*1000) $finish;# _$ h2 f6 x0 a5 [+ l$ i% v
end
: [$ M% B( N0 i4 b7 H 4 D, d* K* H. E. H
always #(10*dely) cin=$random;) J* m, ]5 ^0 Y4 \4 m1 z
$ ? r) v# W6 h6 ` T# k always #(10*dely) ina=$random;
4 n5 K- @ T% c! y2 \# H " \' A: ?+ I8 Y% G; H+ E
always #(10*dely) inb=$random; ; Q# @; f$ E' z: G/ V. c" X1 V
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initial
0 Z6 c' z. B' ~( x2 J1 }, z1 x $monitor($realtime,,"ps %h %h %h %h %h %h ",cout,sum,ina,inb,cin,clk);
1 W- F4 {* P9 q) A1 @* nendmodule. ~; y R1 h% T _( ~5 D$ J' K
但是仿真出来的波形明显不对啊 |
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