TA的每日心情 | 擦汗 2020-1-14 15:59 |
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签到天数: 1 天 [LV.1]初来乍到
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是一个关于流水线方式实现的8位全加器
+ E; H& B: k# a从书上抄的一个例子:2 W7 V! j7 X$ V9 J% ^
module pipeline(cout,sum,ina,inb,cin,clk);9 S5 G% D' _8 X8 E3 F) m r5 Z, `
$ z9 w( T- P: r" j( k) R6 p output [7:0] sum;) _! @# z: N4 x8 F+ e% w) ?
output cout;
+ v q1 q- F& y input [7:0] ina;; m! `7 N' g W `( e- R! X/ [
input [7:0] inb;# b$ z" x% @* c
input cin,clk;9 p/ {1 o" P, L0 l/ ?/ V
reg [7:0] tempa,tempb,sum;
' a% h7 m3 h! `: O reg tempci,firstco,secondco,thirdco,cout;
: [& S5 p/ ?1 V) {% S reg [1:0] firsts,thirda,thirdb;
8 b. ^) U9 U$ ?4 h& ] reg [3:0] seconda;' }0 v& q J2 }
reg [3:0] secondb;9 E4 g% {/ [ x
reg [3:0] seconds;0 M9 ?8 p7 w3 Y9 U
reg [5:0] firsta,firstb,thirds;3 A. t) `' W+ Y$ f; r' E
; u- X& k4 A3 e( G% [7 ?9 m always @(posedge clk) $ y$ w( ]: L# S% k
begin
& @! ]4 q9 u+ [9 b+ c, Z+ c tempa=ina;; \7 Y& w! `5 J2 A$ q' p& H W) N4 O
tempb=inb;# f# ], A7 I/ d L+ c a
tempci=cin;9 W8 X, P. H" P! }' K
end & n/ D* i- Y/ h. E/ y5 L6 g; P0 s
{2 ]6 n1 k2 R3 z- K always @(posedge clk) 6 [% M$ H3 D' k% P( ^9 g# ~
begin 1 A+ \. b) Y/ i7 }; g6 e9 A
{firstco,firsts}=tempa[1:0]+tempb[1:0]+tempci;
) ?! U- J, `$ V& t) ?3 U+ U# J) _ firsta=tempa[7:2];9 x% m& ]- i( P/ T) B6 n+ P
firstb=tempb[7:2];
9 ?6 |+ M% Q4 }2 j z9 P end ' [/ h1 M8 _7 i/ g6 N0 L3 ?
* o+ j2 b/ }! O) @ always @(posedge clk) . \/ T6 R: q' o7 R7 Q5 ~* s$ O; }
begin
5 n4 M0 S, V0 W" `) D; u! b {secondco,seconds}={firsta[1:0]+firstb[1:0]+firstco,firsts}; X! g: F7 ]: T
seconda=firsta[5:2];: }9 |: J" G6 e# S& c% g
secondb=firstb[5:2];, k4 D0 X6 o2 i5 v% B4 y
end, C* r( l, A& B- \
; m* H! Y. P3 p) j7 @
always @(posedge clk) ' C8 k" z# n( Y
begin
" R! ?6 j) X- x# K! M" |0 V3 y4 z7 N5 k {thirdco,thirds}={seconda[1:0]+secondb[1:0]+secondco,seconds};
( T' ^4 ^) x* }% U( @ thirda=seconda[3:2];
3 r K: v' ?+ |2 h4 l) X* P thirdb=secondb[3:2];
4 n p& W5 h" }* i$ P& q end+ J3 n4 a3 o9 N
) \3 s9 Y6 S' V+ I7 L always @(posedge clk) 8 P/ k& ?) ]( V. [6 L% k8 C
begin 7 _3 ?9 d" R: v
{cout,sum}={thirda[1:0]+thirdb[1:0]+thirdco,thirds};) @% f5 j. L9 f$ q6 @
end+ h; T. }5 H# H/ f: }! _+ I# D
+ V4 ]! p. q3 N# N, T" F
endmodule0 Q1 z# Z4 f: Q1 I1 Q1 \
自己写了一个激励文件:5 e$ b- w/ o3 a3 ~8 s. `: R. G
`timescale 10ns / 1ns# j) K" d7 m* ?1 V% ~
module pipeline_tb;
: M5 I4 v) S1 e" ] / b% l! R: a# f' d% d
5 T* o$ I3 y) v6 b Y+ ~ //Internal signals declarations:
# ?; |( g9 L; L. R! s& Z. t wire cout;
: h+ t5 H r5 p, }2 ?) d wire [7:0]sum;
4 y4 x: t& z# d( l reg [7:0]ina;1 ~. r+ `& D" T+ w
reg [7:0]inb;# J6 p; H# W) e) C
reg cin;0 b8 V) d9 S! j! }/ {
reg clk;
2 A* _0 j: H; ?, H parameter dely=10;
z9 w' M- ?1 m3 j2 B
2 ]0 W% y' N" G4 [
. Q+ U$ m' U: t( G // Unit Under Test port map6 O# c% t8 ?+ B1 v; R. X
pipeline UUT (* y, M* S: H5 z3 Z, |9 }3 F( E
.cout(cout),
- u% j9 ^, t3 }5 c& k9 D .sum(sum),8 h- t, m) ]. p% _% @# q3 H
.ina(ina),5 L# J4 O6 s! c
.inb(inb),
) U' W f5 R( W& p7 Y .cin(cin),
! J ~6 P1 H# \9 V .clk(clk));
, D0 w( A6 F( l: m1 e 1 y! N- U% X$ {' Y& j+ P
always #(dely/2)clk=~clk;
% S# d! B$ \. E/ V0 R: Z - ^! e) j e5 R/ m' M2 _3 M
initial . z E- k. P: _; T% A
begin
2 l9 ]6 e3 L0 F* y6 o4 S clk=0;) b* a! m& O% c3 |, P# J9 g
cin=0;) I% R0 F' v; j% Z( e6 D! _
ina=8'b0;( Q# Y1 `3 D6 m+ Q# _: G- w
inb=8'b0;
8 u. U' s; [7 @' P8 A9 { #(dely*1000) $finish;+ z# [6 s; p$ d, p; b& R/ t& K8 K
end
2 J/ F! o' R% i# i( p9 P `1 D' D
# J) \* s. a# l1 e* p9 Z always #(10*dely) cin=$random;: e, K" A/ W3 V( p
9 y, J% l9 k/ B) Z2 x2 Q' I. ] always #(10*dely) ina=$random; . B: X- `! r: R. j. t
% S+ M4 }7 ]8 \0 u always #(10*dely) inb=$random; 1 Q, Q* Z" E) }
" h( b2 ~6 i2 j2 Q9 k, d! w; T
initial
$ i$ D8 O5 v" Q2 U1 t $monitor($realtime,,"ps %h %h %h %h %h %h ",cout,sum,ina,inb,cin,clk);
' H, N1 ]0 ? v( i' I ^- E% Aendmodule+ p( Z& d. a7 Z) |
但是仿真出来的波形明显不对啊 |
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