vhdl语言实验报告.docx
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vhdl语言实验报告
电子设计自动化
多路波形发生器
指导老师：
刘彪
电气工程学院
电气1003班
杨黎
10291094
2012年10月27日
一、实验题目要求
1、对输入时钟信号进行分频，实现三路互差120°
的信号。
2、实现输出信号的占空比控制
clk:
输入时钟信号
reset:
同步复位信号（低电平有效）
div:
输入分频控制信号（注意：
6n分频）
ctrl:
占空比控制信号
ctrl=1时,占空比为1:
1
ctrl=2时,占空比为1:
2
ctrl=3时,占空比为2:
1
A,B,C:
三路输出信号
二、设计思路及方案
1、多路发生器的基本原理分频器而且是可调的。
因此可以先设计多个子程序分别使得信号发生器的产生的占空比分别为1:
1,1:
2,2:
1；因此先设div:
integerrange1to4;。
通过信号赋值（tmp,tmp1,tmp2）赋给输出信号A,B,C.通过n改变输出频率。
定义各个变量。
2、当resetb=0时,countQ=0；
当resetb=1时。
给脉冲时先定义分频比如果countQ<（6*div-1）时countQ<=countQ否则countQ为0。
3、当cltr=01时即H:
L=1:
1时
①如果countQ<3*div时tmp<=’0’;否者tmp<=’1’
②如果countQ<2*divorcountQ>（6*div-2））时tmp1<='1';
否者tmp1<='0';
③如果countQ（4*div-1）时tmp2<='0';
④否者tmp2<='1';
⑤A等于tmp；B=tmp2；C=tmp3；
同理：
当cltr=10时即H:
L=1:
2时
当cltr=11时即H:
L=2:
1时。
其中；公式推导如下：
当div=1,cltr=01时当div=2，cltr=01时
countQ<6countQ<12
A：
000111；A:
000000111111
B：
110001；B:
111100000011
C：
011100；C:
001111110000
A：
countQ<3时tmp=0A；countQ<6时tmp=0
Elsetmp=1Elsetmp=1
B：
countQ<2orcountQ>4时tmp=1B：
countQ<4orcountQ>10，tmp=1
Elsetmp=0Elsetmp=0
C:
countQ<1orcountQ>3时tmp=0C:
countQ<2orcountQ>7时tmp=0
Elsetmp=1Elsetmp=1
同理：
cltr=10，cltr=11.
当cltr=01时
if（countQ<3*div）thentmp<='0';elsetmp<='1';
if（countQ<2*divorcountQ>（6*div-2））thentmp1<='1';elsetmp1<='0';
if（countQ（4*div-1））thentmp2<='0';elsetmp2<='1';
当cltr=10时
if（countQ<4*div）thentmp<='0';elsetmp<='1';
if（countQ<2*div）thentmp1<='1';elsetmp1<='0';
if（countQ<2*divorcountQ>（4*div-1））thentmp2<='0';elsetmp2<='1';
当cltr=11时
if（countQ<2*div）thentmp<='0';elsetmp<='1';
if（countQ<2*divorcountQ>（4*div-1））thentmp1<='1';elsetmp1<='0';
if（countQ<4*div）thentmp2<='1';elsetmp2<='0';
将信号tmp赋给A;tmp1赋给B；tmp2赋给C;
三、流程图
Reset=0?
01
Tmp、tmp1、tmp2=0
是否有信号输入
Tmp=atmp1=btmp2=c
判定ctrl的值
否
是
123
调用相应的子程序
四、实验程序及其波形
libraryieee;
useieee.std_logic_1164.all;
useieee.std_logic_arith.all;
useieee.std_logic_unsigned.all;
entityfashengqis
port
（
clk:
instd_logic;
aclk:
outstd_logic;
bclk:
outstd_logic;
cclk:
outstd_logic;
resetb:
instd_logic;
div:
instd_logic_vector（1downto0）;
ctrl:
instd_logic_vector（1downto0）
）;
endfangshengq;
architecturebehaveoffangshengqis
signaltmp:
std_logic;
signaltmp1:
std_logic;
signaltmp2:
std_logic;
signalcnt0:
integerrange0to5:
=0;
signalcnt1:
integerrange0to11:
=0;
signalcnt2:
integerrange0to17:
=0;
signalcnt3:
integerrange0to23:
=0;
begin
process（clk,resetb,div,ctrl）
begin
ifclk'eventandclk='1'then
ifresetb='0'then
cnt0<=0;
cnt1<=0;
cnt2<=0;
cnt3<=0;
tmp<='0';
tmp1<='0';
tmp2<='0';
elsifresetb='1'then
cnt0<=cnt0+1;
cnt1<=cnt1+1;
cnt2<=cnt2+1;
cnt3<=cnt3+1;
casectrlis
when"01"=>
casedivis
when"00"=>
casecnt0is
when0=>tmp<='0';tmp1<='1';tmp2<='0';
when1=>tmp<='0';tmp1<='1';tmp2<='1';
when2=>tmp<='0';tmp1<='0';tmp2<='1';
when3=>tmp<='1';tmp1<='0';tmp2<='1';
when4=>tmp<='1';tmp1<='0';tmp2<='0';
when5=>tmp<='1';tmp1<='1';tmp2<='0';cnt0<=0;
endcase;
when"01"=>
casecnt1is
when0=>tmp<='0';tmp1<='1';tmp2<='0';
when1=>tmp<='0';tmp1<='1';tmp2<='0';
when2=>tmp<='0';tmp1<='1';tmp2<='1';
when3=>tmp<='0';tmp1<='1';tmp2<='1';
when4=>tmp<='0';tmp1<='0';tmp2<='1';
when5=>tmp<='0';tmp1<='0';tmp2<='1';
when6=>tmp<='1';tmp1<='0';tmp2<='1';
when7=>tmp<='1';tmp1<='0';tmp2<='1';
when8=>tmp<='1';tmp1<='0';tmp2<='0';
when9=>tmp<='1';tmp1<='0';tmp2<='0';
when10=>tmp<='1';tmp1<='1';tmp2<='0';
when11=>tmp<='1';tmp1<='1';tmp2<='0';cnt1<=0;
endcase;
when"10"=>
casecnt2is
when0=>tmp<='0';tmp1<='1';tmp2<='0';
when1=>tmp<='0';tmp1<='1';tmp2<='0';
when2=>tmp<='0';tmp1<='1';tmp2<='0';
when3=>tmp<='0';tmp1<='1';tmp2<='1';
when4=>tmp<='0';tmp1<='1';tmp2<='1';
when5=>tmp<='0';tmp1<='1';tmp2<='1';
when6=>tmp<='0';tmp1<='0';tmp2<='1';
when7=>tmp<='0';tmp1<='0';tmp2<='1';
when8=>tmp<='0';tmp1<='0';tmp2<='1';
when9=>tmp<='1';tmp1<='0';tmp2<='1';
when10=>tmp<='1';tmp1<='0';tmp2<='1';
when11=>tmp<='1';tmp1<='0';tmp2<='1';
when12=>tmp<='1';tmp1<='0';tmp2<='0';
when13=>tmp<='1';tmp1<='0';tmp2<='0';
when14=>tmp<='1';tmp1<='0';tmp2<='0';
when15=>tmp<='1';tmp1<='1';tmp2<='0';
when16=>tmp<='1';tmp1<='1';tmp2<='0';
when17=>tmp<='1';tmp1<='1';tmp2<='0';cnt2<=0;
endcase;
when"11"=>
casecnt3is
when0=>tmp<='0';tmp1<='1';tmp2<='0';
when1=>tmp<='0';tmp1<='1';tmp2<='0';
when2=>tmp<='0';tmp1<='1';tmp2<='0';
when3=>tmp<='0';tmp1<='1';tmp2<='0';
when4=>tmp<='0';tmp1<='1';tmp2<='1';
when5=>tmp<='0';tmp1<='1';tmp2<='1';
when6=>tmp<='0';tmp1<='1';tmp2<='1';
when7=>tmp<='0';tmp1<='1';tmp2<='1';
when8=>tmp<='0';tmp1<='0';tmp2<='1';
when9=>tmp<='0';tmp1<='0';tmp2<='1';
when10=>tmp<='0';tmp1<='0';tmp2<='1';
when11=>tmp<='0';tmp1<='0';tmp2<='1';
when12=>tmp<='1';tmp1<='0';tmp2<='1';
when13=>tmp<='1';tmp1<='0';tmp2<='1';
when14=>tmp<='1';tmp1<='0';tmp2<='1';
when15=>tmp<='1';tmp1<='0';tmp2<='1';
when16=>tmp<='1';tmp1<='0';tmp2<='0';
when17=>tmp<='1';tmp1<='0';tmp2<='0';
when18=>tmp<='1';tmp1<='0';tmp2<='0';
when19=>tmp<='1';tmp1<='0';tmp2<='0';
when20=>tmp<='1';tmp1<='1';tmp2<='0';
when21=>tmp<='1';tmp1<='1';tmp2<='0';
when22=>tmp<='1';tmp1<='1';tmp2<='0';
when23=>tmp<='1';tmp1<='1';tmp2<='0';cnt3<=0;
endcase;
endcase;
when"10"=>
casedivis
when"00"=>
casecnt0is
when0=>tmp<='0';tmp1<='1';tmp2<='0';
when1=>tmp<='0';tmp1<='1';tmp2<='0';
when2=>tmp<='0';tmp1<='0';tmp2<='1';
when3=>tmp<='0';tmp1<='0';tmp2<='1';
when4=>tmp<='1';tmp1<='0';tmp2<='0';
when5=>tmp<='1';tmp1<='0';tmp2<='0';cnt0<=0;
endcase;
when"01"=>
casecnt1is
when0=>tmp<='0';tmp1<='1';tmp2<='0';
when1=>tmp<='0';tmp1<='1';tmp2<='0';
when2=>tmp<='0';tmp1<='1';tmp2<='0';
when3=>tmp<='0';tmp1<='1';tmp2<='0';
when4=>tmp<='0';tmp1<='0';tmp2<='1';
when5=>tmp<='0';tmp1<='0';tmp2<='1';
when6=>tmp<='0';tmp1<='0';tmp2<='1';
when7=>tmp<='0';tmp1<='0';tmp2<='1';
when8=>tmp<='1';tmp1<='0';tmp2<='0';
when9=>tmp<='1';tmp1<='0';tmp2<='0';
when10=>tmp<='1';tmp1<='0';tmp2<='0';
when11=>tmp<='1';tmp1<='0';tmp2<='0';cnt1<=0;
endcase;
when"10"=>
casecnt2is
when0=>tmp<='0';tmp1<='1';tmp2<='0';
when1=>tmp<='0';tmp1<='1';tmp2<='0';
when2=>tmp<='0';tmp1<='1';tmp2<='0';
when3=>tmp<='0';tmp1<='1';tmp2<='0';
when4=>tmp<='0';tmp1<='1';tmp2<='0';
when5=>tmp<='0';tmp1<='1';tmp2<='0';
when6=>tmp<='0';tmp1<='0';tmp2<='1';
when7=>tmp<='0';tmp1<='0';tmp2<='1';
when8=>tmp<='0';tmp1<='0';tmp2<='1';
when9=>tmp<='0';tmp1<='0';tmp2<='1';
when10=>tmp<='0';tmp1<='0';tmp2<='1';
when11=>tmp<='0';tmp1<='0';tmp2<='1';
when12=>tmp<='1';tmp1<='0';tmp2<='0';
when13=>tmp<='1';tmp1<='0';tmp2<='0';
when14=>tmp<='1';tmp1<='0';tmp2<='0';
when15=>tmp<='1';tmp1<='0';tmp2<='0';
when16=>tmp<='1';tmp1<='0';tmp2<='0';
when17=>tmp<='1';tmp1<='0';tmp2<='0';cnt2<=0;
endcase;
when"11"=>
casecnt3is
when0=>tmp<='0';tmp1<='1';tmp2<='0';
when1=>tmp<='0';tmp1<='1';tmp2<='0';
when2=>tmp<='0';tmp1<='1';tmp2<='0';
when3=>tmp<='0';tmp1<='1';tmp2<='0';
when4=>tmp<='0';tmp1<='1';tmp2<='0';
when5=>tmp<='0';tmp1<='1';tmp2<='0';
when6=>tmp<='0';tmp1<='1';tmp2<='0';
when7=>tmp<='0';tmp1<='1';tmp2<='0';
when8=>tmp<='0';tmp1<='0';tmp2<='1';
when9=>tmp<='0';tmp1<='0';tmp2<='1';
when10=>tmp<='0';tmp1<='0';tmp2<='1';
when11=>tmp<='0';tmp1<='0';tmp2<='1';
when12=>tmp<='0';tmp1<='0';tmp2<='1';
when13=>tmp<='0';tmp1<='0';tmp2<='1';
when14=>tmp<='0';tmp1<='0';tmp2<='1';
when15=>tmp<='0';tmp1<='0';tmp2<='1';
when16=>tmp<='1';tmp1<='0';tmp2<='0';
when17=>tmp<='1';tmp1<='0';tmp2<='0';
when18=>tmp<='1';tmp1<='0';tmp2<='0';
when19=>tmp<='1';tmp1<='0';tmp2<='0';
when20=>tmp<='1';tmp1<='0';tmp2<='0';
when21=>tmp<='1';tmp1<='0';tmp2<='0';
when22=>tmp<='1';tmp1<='0';tmp2<='0';
when23=>tmp<='1';tmp1<='0';tmp2<='0';cnt3<=0;
endcase;
endcase;
when"11"=>
casedivis
when"00"=>
casecnt0is
when0=>tmp<='0';tmp1<='1';tmp2<='1';
when1=>tmp<='0';tmp1<='1';tmp2<='1';
when2=>tmp<='1';tmp1<='0';tmp2<='1';
when3=>tmp<='1';tmp1<='0';tmp2<='1';
when4=>tmp<='1';tmp1<='1';tmp2<='0';
when5=>tmp<='1';tmp1<='1';tmp2<='0';cnt0<=0;
endcase;
when"01"=>
casecnt1is
when0=>tmp<='0';tmp1<='1';tmp2<='1';
when1=>tmp<='0';tmp1<='1';tmp2<='1';
when2=>tmp<='0';tmp1<='1';tmp2<='1';
when3=>tmp<='0';tmp1<='1';tmp2<='1';
when4=>tmp<='1';tmp1<='0';tmp2<='1';
when5=>tmp<='1';tmp1<='0';tmp2<='1';
when6=>tmp<='1';tmp1<='0';tmp2<='1';
when7=>tmp<='1';tmp1<='0';tmp2<='1';
when8=>tmp<='1';tmp1<='1';tmp2<='0';
when9=>tmp<='1';tmp1<='1';tmp2<='0';
when10=>tmp<='1';tmp1<='1';tmp2<='0';
when11=>tmp<='1';tmp1<='1';tmp2<='0';cnt1<=0;
endcase;
when"10"=>
casecnt2is
when0=>tmp<='0';tmp1<='1';tmp2<='1';
when1=>tmp<='0';tmp1<='1';tmp2<='1';
when2=>tmp<='0';tmp1<='1';tmp2<='1';
when3=>tmp<='0';tmp1<='1';tmp2<='1';
when4=>tmp<='0';tmp1<='1';tmp2<='1';
when5=>tmp<='0';tmp1<='1';tmp2<='1';
when6=>tmp<='1';tmp1<='0';tmp2<='1';
when7=>tmp<='1';tmp1<='0';tmp2<='1';
when8=>tmp<='1';tmp1<='0';tmp2<='1';
when9=>tmp<='1';tmp1<='0';tmp2<='1';
when10=>tmp<='1';tmp1<='0';tmp2<='1';
when11=>tmp<='1';tmp1<='0';tmp2<='1';
when12=>tmp<='1';tmp1<='1';tmp2<='0';
when13=>tmp<='1';tmp1<='1';tmp2<='0';
when14=>tmp<='1';tmp1<='1';tmp2<='0';
when15=>tmp<='1';tmp1<='1';tmp2<='0';
when16=>tmp<='1';tmp1<='1';tmp2<='0';
when17=>tmp<='1';tmp1<='1';tmp2<='0';cnt2<=0;
endcase;
when"11"=>
casecnt3is
when0=>tmp<='0';tmp1<='1';tmp2<='1';
when1=>tmp<='0';tmp1<='1';tmp2<='1';
when2=>tmp<='0';tmp1<='1';tmp2<='1';
when3=>tmp<='0';tmp1<='1';tmp2<='1';
when4=>tmp<='0';tmp1<='1';tmp2<='1';
when5=>tmp<='0';tmp1<='1';tmp2<='1';
when6=>tmp<='0';tmp1<='1';tmp2<='1';
when7=>tmp<='0';tmp1<='1';t
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