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
, n# P2 O* `! \从书上抄的一个例子:
- ^$ g( M5 k* |+ x% l) Fmodule pipeline(cout,sum,ina,inb,cin,clk);0 v. |8 j) \# n: V2 `1 M5 j/ T
8 n. b' n' K; e0 ^4 G' P% C9 K; T output [7:0] sum;4 g- w" b8 k/ P
output cout;
3 X8 ~5 A6 v6 f( V# R input [7:0] ina;
) t( j) }! ~/ }! W6 }( [ input [7:0] inb;
. X$ t+ ^2 V8 v. M6 t# O/ F input cin,clk;' S8 s# m2 m; ?; A- U% {8 d
reg [7:0] tempa,tempb,sum;" T3 W- b& ^4 `% g$ [
reg tempci,firstco,secondco,thirdco,cout;
I R8 X% ^* z! o, c- g x reg [1:0] firsts,thirda,thirdb;6 k4 j! T) B2 q8 A
reg [3:0] seconda;
' E1 [$ T* a# Z5 Q9 V reg [3:0] secondb; J$ C5 k0 ]* q7 o3 t/ E
reg [3:0] seconds;
8 i' W0 V- x$ u5 D+ d) G reg [5:0] firsta,firstb,thirds;
+ }( S0 H: a! ?9 H7 N+ R. x 9 i0 K U9 z/ e4 }. `: |% |3 }
always @(posedge clk)
% U# C4 O1 D6 [) r' F0 S0 N begin _! a$ k% g. j' R( ^& ]
tempa=ina;
; }0 E" C9 D$ z2 J5 K/ E tempb=inb;8 D% d7 d# m8 a( ~1 D
tempci=cin;
, ]# ~3 ~( |, g) p/ w end 8 \$ m5 |* P0 ]. @8 b: f1 M
; f: f4 t( z& F- p# A- E3 v
always @(posedge clk) : q0 R- k( s c
begin
: J3 ?8 `, w* s8 l6 S& s {firstco,firsts}=tempa[1:0]+tempb[1:0]+tempci;" Z4 Y3 }. J e
firsta=tempa[7:2];
+ S9 l$ h4 v" P9 \8 [* B' ] firstb=tempb[7:2];" V1 X6 a2 A* P" i: b- t" ?
end 8 c* R# R9 t& Z- M. Y+ s: r
0 o% L1 ~3 R( k always @(posedge clk)
- P' D/ v% x* {6 L begin
6 \/ t( B; n4 j8 s# ]: Q9 @ {secondco,seconds}={firsta[1:0]+firstb[1:0]+firstco,firsts};
- g% P1 |4 t, V0 ?# j5 W/ e- u2 |, _ seconda=firsta[5:2];
. f$ s8 c; w7 |9 K6 j b secondb=firstb[5:2];# ]) y0 o9 ^( }0 e, ]& K: Z
end
- h4 }, A' ?4 O5 j; g8 z" B , |2 o& W& N) r, _( |6 r2 \
always @(posedge clk)
) L$ x, u; z6 V& H6 A1 m) O+ { begin " }+ h7 @8 a) \* w7 k
{thirdco,thirds}={seconda[1:0]+secondb[1:0]+secondco,seconds};
" T& f. u( ^. }4 j9 g2 a thirda=seconda[3:2];
- S8 d% X/ B2 f+ H' K0 s; a thirdb=secondb[3:2];
6 {; |/ y4 z+ E4 ?' A end9 y) p0 v/ \+ d) L/ H# N8 f
- e4 F9 g5 M O9 u$ d
always @(posedge clk)
5 ?' V* S$ L" }4 W1 S' b2 N begin
7 Z: ^: }4 N7 O3 L+ F4 _ {cout,sum}={thirda[1:0]+thirdb[1:0]+thirdco,thirds};* Q A- Q4 _. m! b" U
end
9 s: O" ~$ g0 t% Q! E# }3 R, _1 n
( b( r' D! p. X- {) Jendmodule
) s9 I/ D8 L/ r1 C! v8 S自己写了一个激励文件:
& P# E7 O- F- Z1 z0 ]; u`timescale 10ns / 1ns( V2 ]8 ?, b1 `2 [' f$ [: u) t
module pipeline_tb;
2 s. |- J( O: t/ o/ \& @ ! ~1 {" D2 ~- R1 Q6 [& r
4 A7 b% {2 [! f! I9 d5 j& X3 _2 ? //Internal signals declarations:8 y# A. Q6 {4 _# }. R2 P# U7 ~0 \
wire cout;1 f4 _, b# s! Z5 `# Z' d2 }
wire [7:0]sum;
, Z4 K1 d- G. Z7 u- i3 u: r# l reg [7:0]ina;
+ p8 ~2 |0 L+ e2 J" E+ t reg [7:0]inb;
) p4 n! |6 ]( m, n7 c reg cin;* p* f5 L3 ~ n% j3 |. t p. i
reg clk;
0 R9 H: R! B4 s parameter dely=10;+ I* D5 d& W$ e/ Y8 t
8 F" |* H6 |% O" b: c% ?
2 I2 C3 o" K9 g+ R I- \! b // Unit Under Test port map% L+ p/ x, v, X: I
pipeline UUT (3 [* t( |# e% v f; T
.cout(cout),
m& N7 A/ M) O* H& _5 Z& n T .sum(sum),
3 q1 V7 q# L% k/ y+ c7 @% t .ina(ina),8 g) _* |/ d7 d5 e- v* Q4 R
.inb(inb),
& A5 h3 g6 q+ f A+ L, N2 | .cin(cin),+ E0 |. Z, z0 h! W- M
.clk(clk)); 9 ^( w+ l9 U$ i
1 r: z( _, n+ E m
always #(dely/2)clk=~clk;
" i. _3 k1 S! u( K1 [7 G9 n 5 j9 Y" u& P' l2 B1 o
initial
9 `5 T, `# ^: \! b8 P# ^4 K begin 6 m8 n# g8 h: U# Z# U1 {( J3 A4 u
clk=0;
2 @- Z# G4 S) X' q( [ cin=0;/ d3 b' \' i1 ?, d) c. O5 ~0 T
ina=8'b0;8 `. r6 l% I8 ?* Z
inb=8'b0;
+ s5 j) C- H6 p) ^6 ~' J #(dely*1000) $finish;5 m0 n' ~" P9 S f8 y' ~9 r
end
# w0 v) d V& V% ]9 |5 A3 e; B ! J$ d3 G! ]. G5 s& e; L
always #(10*dely) cin=$random;
6 x- v2 a- g! |( @ . ]3 q! ?" r# P! f3 B) d- O
always #(10*dely) ina=$random; f6 ~- e" d. ^
2 {0 i7 A2 _7 ^ always #(10*dely) inb=$random; 5 d- {. I6 w: C2 v7 x X
/ Q' y+ {$ ]- v& n/ o8 X initial
! F$ `! r+ i/ z' U: ? _0 W $monitor($realtime,,"ps %h %h %h %h %h %h ",cout,sum,ina,inb,cin,clk);2 D1 C; M0 K# Q1 m
endmodule; W' E* Y5 b" N- h- x
但是仿真出来的波形明显不对啊 |
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