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; g4 W9 H3 G* D# u- A: L
从书上抄的一个例子:( Z8 e% ~6 J( K: T& w
module pipeline(cout,sum,ina,inb,cin,clk);" W. Q' _! r! i1 H }- K2 H
( U* |5 d7 t* `; G8 e output [7:0] sum;
; [/ Z$ ]; H/ [( ], n output cout;
% j. d$ A- b+ T h' l9 x input [7:0] ina;
( t9 X l9 A- u2 _ input [7:0] inb;( @. V$ W( r+ O& ]* _
input cin,clk;
' L# l& H4 q2 ~0 v# Z2 c' b& M reg [7:0] tempa,tempb,sum;( a. J2 s" \; A) {# Y: {4 B
reg tempci,firstco,secondco,thirdco,cout;5 J2 k' a# u, K
reg [1:0] firsts,thirda,thirdb;
8 t; h0 R% p {8 d8 Y, M reg [3:0] seconda;3 B9 i6 Y! u- ^6 o$ h
reg [3:0] secondb;* \2 a' Z( [4 F1 ~/ g" V
reg [3:0] seconds;
- z% W3 r" W! t! W$ P reg [5:0] firsta,firstb,thirds;
2 S0 |4 v! k$ ?& T v/ Z( F 0 C0 F/ r9 u0 A! b- I$ h3 X0 ]
always @(posedge clk)
3 G/ `3 k6 p: _- v$ {" { begin: L2 i+ q) U, ]; }2 J/ V" S
tempa=ina;" L! g- M! @" I; Q8 b7 E$ f4 ?
tempb=inb;
& p& M# b% L5 J- O6 K. B) N tempci=cin;
; e0 D2 u! G8 f, X; L: C1 ?: D Z* O end
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always @(posedge clk) " L% z) j) i' @5 C! Q6 W- c
begin
- v: t- y {4 k6 J {firstco,firsts}=tempa[1:0]+tempb[1:0]+tempci;
9 q/ {4 w$ q. b% } firsta=tempa[7:2];( v6 [' r8 G4 f! J: y6 [
firstb=tempb[7:2];
7 ^& b2 C( k# E. Q end
% R+ V; c* c* Z5 f
" [9 ^: m) R! I always @(posedge clk) ' {& Q0 m+ g! O4 e4 k9 d' @1 e# g
begin
# Q8 L' b3 |9 |, g7 v# b {secondco,seconds}={firsta[1:0]+firstb[1:0]+firstco,firsts};
* s9 F7 r8 X3 a seconda=firsta[5:2];! u! I {0 ]( U+ D1 A0 A4 ~* z" p
secondb=firstb[5:2];
7 C& p d1 Y6 ]; F9 _0 v" v Y end: h6 _+ R) B9 m2 v
) S7 c4 ~+ ]) l always @(posedge clk)
~% b# S! |) _9 ~$ t- V begin 9 w. a$ {: L7 ~% h
{thirdco,thirds}={seconda[1:0]+secondb[1:0]+secondco,seconds};6 Q1 }; A0 c" r* d }
thirda=seconda[3:2];
9 x: S e, X- q/ V$ F1 ~ thirdb=secondb[3:2];
& U# |/ S1 V+ a2 T+ ]3 C end/ }; @& n0 K# a3 }6 v) c# o
3 c% Z5 u0 |, x5 e. I always @(posedge clk)
. `- u; ]; Y3 n3 o1 K' f1 c' p begin
" I9 @4 e! G% m( [ {cout,sum}={thirda[1:0]+thirdb[1:0]+thirdco,thirds};+ f, _2 V9 K" N; e6 i( h
end
8 R/ O/ _- o( d+ A* S
6 @! m A- ^$ m7 m( G' Cendmodule$ g7 |( o% k+ k6 s# k+ x5 _
自己写了一个激励文件:/ X6 b) r# L8 g0 b. `
`timescale 10ns / 1ns
: {# a7 m0 F1 O7 Z( h0 lmodule pipeline_tb;1 u0 V; \1 K5 t8 H5 [
4 M4 d' `# Z& z- b, u: N9 y; E/ A
& @) @. ~, f/ A* F. I) R# p //Internal signals declarations:! t& R. I6 S4 d5 w( p3 I
wire cout;; g! R f w3 U1 O& m4 |
wire [7:0]sum;
6 g: [- w! F' |9 p$ v7 v" s reg [7:0]ina;/ _6 r0 L% v) W; x3 Y
reg [7:0]inb;
/ D/ T, |) G& p9 V$ o- O- K S reg cin;
% J9 K8 b9 r+ ?. Q( x( ] reg clk;
2 W. f B _- f) x+ \7 m% x parameter dely=10;
S& n) r* X* q; X: t6 n/ E, i' _ " O: ~/ P8 W% J" J
; U7 l; I$ e! s // Unit Under Test port map
/ S+ w& }) t. X pipeline UUT (2 z% l2 G, z* R# n9 L8 u a# _8 H
.cout(cout),
9 w8 u% ?$ i$ V0 l' w .sum(sum),- h" R# `9 ?! B& W' g, O
.ina(ina),6 g; p% p$ r! U. ~( S
.inb(inb),0 ^/ E) i ?0 U1 R# V) }, Z8 |4 {
.cin(cin),
9 R" z/ h9 R$ f. ? .clk(clk));
- a4 g( v- ~, w1 @" q ! T! s( `5 s+ G# b
always #(dely/2)clk=~clk; 5 Y" J* O3 } Q' G
' B$ m! V/ D0 [& y$ t7 X0 v initial - T( E2 i7 [- |- r$ v& i
begin
: k0 [5 T X7 p) `/ f% k9 a2 [1 T clk=0;
7 L; Z; M' ^* E! x cin=0;
4 ~* _) i) ?9 ?7 F/ X0 m ina=8'b0;
& k% h7 ^: R9 \' X4 O0 K inb=8'b0;- ^$ B: q" f7 T6 M; l! y
#(dely*1000) $finish;+ Y! }1 |0 t& \4 u) ]' z5 S
end P- j5 T0 Q1 J; y" Z) w6 `
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always #(10*dely) cin=$random;
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always #(10*dely) ina=$random;
( s% U% [% y, G. F, a# x* Y
7 I: ?, Z7 q1 w; y always #(10*dely) inb=$random; " F1 l6 u& R6 `8 Q- N/ J( y. e
! ]+ h$ Z0 D( v- `0 A4 [9 ^ initial3 Y, Q- o' j" L5 |' n+ t& T# {
$monitor($realtime,,"ps %h %h %h %h %h %h ",cout,sum,ina,inb,cin,clk);
/ ~7 |4 i, F+ ^endmodule# T( {" \2 W7 p1 e$ J! E& l0 y0 d
但是仿真出来的波形明显不对啊 |
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