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7 T; ^3 r. I; `) m
从书上抄的一个例子:
# n, O; \* J4 j3 u7 L; Fmodule pipeline(cout,sum,ina,inb,cin,clk);
* v, k G5 L8 `- H7 i% p3 P {- p
; ]$ ~* \+ c% N2 }) B output [7:0] sum;1 E$ t) K' I: o8 H8 t- P$ x
output cout;
0 s- \0 i7 N. Z' Z input [7:0] ina;
6 e1 S* I' W: B. s0 t input [7:0] inb;
1 L; j$ v8 l$ V input cin,clk;; N7 R1 e7 k' C+ v3 ^; t+ O
reg [7:0] tempa,tempb,sum;
Y7 r2 {! h1 M) ]' X reg tempci,firstco,secondco,thirdco,cout;
- U6 p* `! K9 Y0 N+ M' ~& o! P reg [1:0] firsts,thirda,thirdb;3 b. s2 x; i/ u. K- i- S9 c
reg [3:0] seconda;
) @. U; d9 J7 [6 {- G, e9 I1 s: U reg [3:0] secondb;% \% w9 r4 F# h) M
reg [3:0] seconds;
! ]& d2 g5 O& X reg [5:0] firsta,firstb,thirds;
8 ^2 j. r3 s% y& `+ c% M/ T0 `
m: r! c. M- `" ]+ Y+ s7 J a- Z1 x. v always @(posedge clk) / n% K! d% L# Z! \! N$ T# b3 v* d( |
begin
3 h6 I) ^' \) t& {, U1 R tempa=ina;
. @* J" q t2 H% @ tempb=inb;
# y" h: Q% K" {# J8 x tempci=cin;
! ~6 }; j- I; o end
7 k8 A( d0 T0 B7 }0 y% F . ^3 L* r0 Z3 }8 Q5 ]2 l
always @(posedge clk)
" z* g$ t2 H2 |8 B G begin
0 m6 Q: d1 j) x2 U% j' T2 y2 T6 Z {firstco,firsts}=tempa[1:0]+tempb[1:0]+tempci;+ [4 r7 [ @" c" S' G$ U
firsta=tempa[7:2];; v+ }6 \+ D0 U% f
firstb=tempb[7:2];( h6 U' |' g' u; {) w; v
end
5 F# R4 a, m3 D2 k
0 [/ r6 s' J5 O9 V% [9 X8 I& I always @(posedge clk)
$ k3 @' j8 a' W- ?! X' D begin* m% J4 d3 }4 M/ V9 k4 c6 e
{secondco,seconds}={firsta[1:0]+firstb[1:0]+firstco,firsts};( b& F1 Z; R" p! b1 ^
seconda=firsta[5:2];
* E- h. M% G! H3 Z0 e: y secondb=firstb[5:2];
/ d- K" x! @2 \: a# ^ end
' Q+ H. I9 Q! ?4 d) U
" f( u `6 l4 O! M) l0 D always @(posedge clk)
% `/ F; r4 A6 [ begin
/ U% ^4 R4 B6 _9 ]' H {thirdco,thirds}={seconda[1:0]+secondb[1:0]+secondco,seconds};; T& N. h5 y$ f; s
thirda=seconda[3:2];6 a, w3 s& G x! j. i8 K
thirdb=secondb[3:2];
3 h# T, S" x" n0 u' T- r) E end
% ~' e2 E0 |0 C3 Q1 b7 o$ q# W0 N$ R8 B / C! a( n1 Y! r1 V
always @(posedge clk) . Q% S9 _8 @4 t# _# T& z# @
begin ; E. I. s7 [: k3 k+ w9 r( v1 b
{cout,sum}={thirda[1:0]+thirdb[1:0]+thirdco,thirds};# N; }5 \6 N y/ L P8 `! ^
end
4 M4 G$ p. w( h. _
t# L6 ` j! V% W0 l" ~5 q @endmodule! W/ [2 W: {" \9 P7 k7 B: X0 `0 ?$ Q
自己写了一个激励文件:6 R' |4 K; A8 j
`timescale 10ns / 1ns/ |" n6 p5 t; a9 L( D7 ^. L& i0 i
module pipeline_tb;9 F6 l, o1 k( e
6 l( O5 l! w4 q: f
6 c6 t! d, Z- R8 E* T; w; l //Internal signals declarations:
3 Y) X- G% j( I5 x# n3 o wire cout;- `7 H8 U1 D: A! k. X9 c* @
wire [7:0]sum;
6 R4 \/ m& {& q% G$ f7 u- ^/ ^2 U* f reg [7:0]ina;
1 h- x. y5 }- m( O reg [7:0]inb;
# D5 j& |* L; }, Y$ k reg cin;3 @+ o) Z. }" z8 L# Q' R& y9 U) I" d
reg clk;
0 a1 t# ]1 ?3 R8 r, w8 i parameter dely=10;
: ?) X% k2 p+ y- G* I7 m, g& Z- {8 o
; @$ L a) }7 s9 L) T" \ @0 Y . P: Q$ Z- n" ]% y ^0 Z
// Unit Under Test port map; X/ W8 H% Z& R `
pipeline UUT (
0 S2 O$ V2 ]4 h j .cout(cout),+ ?$ b4 [# a- S( ]
.sum(sum),
$ h( Z! e$ D; k8 M .ina(ina),- G& y5 {1 S9 _% t$ V( H
.inb(inb),& q# z4 U: h; a1 T% L" Z
.cin(cin),
0 X/ W1 u' W1 h8 L; ]7 y .clk(clk));
0 G% H8 C* Y* i1 p6 }1 h
2 h2 x7 `, R e$ h. L0 [$ k always #(dely/2)clk=~clk; % n M B( O/ J! s1 d9 `
7 Y! W/ j# n: z, d/ } initial 3 ?9 X' q* E! K8 A3 U# ?) l
begin ; M& Z" s: [3 A9 `8 Y" E
clk=0;
0 R! H' h/ G! M+ J' n$ G/ \ cin=0;- U) ?8 v' d2 X5 C/ u, S
ina=8'b0;
8 g/ S* R# n4 c$ H1 y inb=8'b0;
& u' v# T9 | o5 ` #(dely*1000) $finish;
* b5 ^$ N2 t2 s" c4 o2 L, I: I end
: \, A: \( x, A 8 g6 P5 C) h" u# D
always #(10*dely) cin=$random;
7 E8 q% @: |1 j! t 7 L! c2 s7 x }$ q) P
always #(10*dely) ina=$random;
3 j8 @4 c2 `7 U$ |2 K1 ?1 D1 N- R
+ N( i5 |5 [. R d' O( M% L always #(10*dely) inb=$random;
% i0 {' _. i" d3 `# s4 ] L/ O- b & g. x, W1 Z* z
initial
m' l; ~$ }" F1 o $monitor($realtime,,"ps %h %h %h %h %h %h ",cout,sum,ina,inb,cin,clk);: k- r. w" h T+ d0 q, v
endmodule
% ^: `' L. h( g' s但是仿真出来的波形明显不对啊 |
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