CPLD和FPGA 是不是很难被**？

只看该作者 · 2012-3-30 09:43

请有经验的大虾指教。

只看该作者 · 2012-3-30 10:04

大多数据都可以直接读出

只看该作者 · 2012-3-30 11:35

本帖最后由 mr.king 于 2012-3-30 11:40 编辑

读出难以逆向工程,至少我不会逆向.呵呵.而且我看我自己的代码,靠有限的注释,如果直接给别人估计也难以维护.主要是状态机太复杂了,我看了下,大约1500行代码的状态机,处理10ms之内交互的信号(交互意思是根据动态的返回值,发送新的命令,至少六个不同交互)

只看该作者 · 2012-3-30 11:42

ELSIF rising_edge(CLK) THEN

adcclkcount<=adcclkcount+1;
if adcclkcount=1 then
adcclkcount<=0;
if currentstate=nextstate then
case currentstate is
when poweron=>
powercount<=powercount+1;
DACOUTQ<="1000000000";
DACOUTI<="1000000000";
powerflag<='1';
dactest<=x"00";
when poweroff=>
powercount<=powercount+1;
powerflag<='0';
dactest<=x"01";
when halfrise=>
--test0<=not test0;
DACOUTQ<=dacarray2(count);
DACOUTI<=1023-dacarray2(count);
latch<='0';
dactest<=x"02";
when maxvalue=>
moduate<='1';
savestate<=maxvalue;
dactest<=x"03";
iostate<='0';
DACOUTQ<="1111111111";
DACOUTI<="0000000000";
if latch='0' then
--test0<=not test0;
latch<='1';
case cmdstate is
when cmdAck=>
if codenum>3 then
codeindex<=codeindex+1;
processdatashift(511 downto 1)<=processdatashift(510 downto 0);
else
codeindex<=0;
codenum<=codenum+1;
end if;

when cmdQueryRep=>
--test0<=not test0;
if codenum>3 then
codeindex<=codeindex+1;
else
codeindex<=0;
codenum<=codenum+1;
end if;

when others=>
--when cmdQuery=>

if codenum>preamble then
codeindex<=codeindex+1;
if ((codeindex mod 16)=13)or ((codeindex mod 16)=14) then
updataflag<='1';
--test1<='1';
end if;
if (codeindex mod 16)=15 then
updataflag<='0';
--shifttemp<="0010110000000000"; --Q=0 DR=64/3

--shifttemp<="0110010000000000"; --Q=2 DR=64/3
shifttemp<=Query(5 downto 0 )& "0000000000"; --Q=2 DR=64/3

--shifttemp<="0100110000000000"; --DR=8
--shifttemp<=codearray2;
--shiftloop<=shiftloop+1;
else
shifttemp(15 downto 1)<=shifttemp(14 downto 0);
end if;
else
codeindex<=0;
codenum<=codenum+1;
end if;
end case;
end if;

when minvalue=>
moduate<='0';
savestate<=minvalue;
dactest<=x"04";
iostate<='0';
DACOUTQ<="0000000000";
DACOUTI<="1111111111";
if latch='0' then
--test0<=not test0;
latch<='1';
case cmdstate is
when cmdAck=>
if codenum>3 then
codeindex<=codeindex+1;
processdatashift(511 downto 1)<=processdatashift(510 downto 0);
else
codeindex<=0;
codenum<=codenum+1;
end if;

when cmdQueryRep=>
--test0<=not test0;
if codenum>3 then
codeindex<=codeindex+1;
else
codeindex<=0;
codenum<=codenum+1;
end if;

when others=>
--when cmdQuery=>

if codenum>preamble then
codeindex<=codeindex+1;
if ((codeindex mod 16)=13)or ((codeindex mod 16)=14) then
updataflag<='1';
end if;
if (codeindex mod 16)=15 then
updataflag<='0';
shifttemp<="0010110000000000";
--test1<='0';
--shifttemp<="1111000010101010";
--?????????????shifttemp<=codearray2;
--shiftloop<=shiftloop+1;
else
shifttemp(15 downto 1)<=shifttemp(14 downto 0);
end if;
else
codeindex<=0;
codenum<=codenum+1;
end if;
end case;
end if;

when newcmd=>

--if (cmdstate=cmdQUERY)then
-- if suspendflag='1' then
-- powerflag<='1';
-- test0<='1';
-- else
-- powerflag<='0';
-- test0<='0';
-- end if;
--else
-- powerflag<='0';
-- test0<='0';
--end if;
test0<=not test0;
--powerflag<='0';

if not(cmdstate=cmdQueryRep)then
if suspendflag='1' then
powerflag<='1';
end if;
else
Queryrepcount<=Queryrepcount+1;
if Queryrepcount=QrepRange then
powerflag<='0';
end if;
end if;

if savestate=maxvalue then
DACOUTI<="0000000000";
DACOUTQ<="1111111111";
else
DACOUTQ<="0000000000";
DACOUTI<="1111111111";
end if;
newcmdexecd<='1';
--test0<='1';
adcclkcount<=0;
count<=0;
--processdatashift(511 downto 494)<=processdata(510 downto 495)&"10";
--要补上不同命令状态的分支差异
processdatashift(511 downto 494)<="01"&shiftrn16;
codeindex<=0;
codenum<=0;
latch<='0';
if (cmdstate=cmdQUERY)or(cmdstate=cmdQueryRep)then
if flag0='1' then
cmdstate<=cmdAck;
dactest<=x"05";
else
dactest<=x"25";
cmdstate<=cmdQueryRep;
end if;
else
dactest<=x"15";
cmdstate<=cmdQueryRep;
end if;

when fallhalf=>
dactest<=x"06";
if iostate='0' then
--test0<=not test0;
iostate<='1';
end if;
DACOUTQ<=dacarray2(249-count);
DACOUTI<=1023-dacarray2(249-count);
prestate<='1'; ----fallhalf;

when halfvalue=>
dactest<=x"07";
powercount<=0;
iostate<='0';
newcmdexecd<='0';
--test0<='0';
DACOUTQ<="1000000000";
DACOUTI<="1000000000";
if latch='0' then
codenum<=codenum+1;
latch<='1';
end if;

when halffall=>
dactest<=x"08";
if iostate='0' then
--test0<=not test0;
iostate<='1';
end if;
DACOUTQ<=1023-dacarray2(count)(9 downto 0);
DACOUTI<=dacarray2(count)(9 downto 0);
prestate<='0'; --halffall;
latch<='0';

when rise=>
dactest<=x"09";
if iostate='0' then
--test0<=not test0;
iostate<='1';
end if;
DACOUTQ<=dacarray1(count);
DACOUTI<=1023-dacarray1(count);
--if count<127 then
-- DACOUTI<=dacarray1(count+128);
--else
-- DACOUTI<=1023-dacarray1(count-128);
--end if;

--DACOUTQ<=conv_std_logic_vector(count,8)&"00";
--DACOUTI<=1023-(conv_std_logic_vector(count,8)&"00");
latch<='0';

when fall=>
dactest<=x"0a";
if iostate='0' then
--test0<=not test0;
iostate<='1';
end if;
DACOUTQ<=dacarray1(489-count);
DACOUTI<=1023-dacarray1(489-count);

--if count<127 then
-- DACOUTI<=1023-dacarray1(count+128);
--else
-- DACOUTI<=dacarray1(count-128);
--end if;

--DACOUTQ<=1023-(conv_std_logic_vector(count,8)&"00");
--DACOUTI<=conv_std_logic_vector(count,8)&"00";

latch<='0';

when risehalf=>
dactest<=x"0b";
if iostate='0' then
--test0<=not test0;
iostate<='1';
end if;
DACOUTQ<=1023-dacarray2(249-count);
DACOUTI<=dacarray2(249-count);

   when others=>
      dactest<=x"ff";
      DACOUTQ<="1000000000";
      DACOUTI<="1000000000";
end case;
count<=count+1;
else
DACOUTQ<=dactemp;
DACOUTI<=1023-dactemp;
count<=0;
end if;
currentstate<=nextstate;
end if;
END IF;
END PROCESS;

PROCESS (currentstate,prestate,count,RESET,codenum, preamble, codeindex, bitlength, shifttemp,cmdstate, wrcount, processdatashift, savestate, newcmdexecd)
variable codetemp:integer range 0 to 65535;
BEGIN
if reset='1' then
--cmdstate<=cmdQuery;
--test1<='0';
trigerflag<='0';

endflag<='0';
saveflag<='0';
else
case currentstate is
when ready=>
if endflag='0'then
--nextstate<=halfrise;
nextstate<=poweron;
dactemp<="1000000000";
finishout<='0';
test1<='1';
addrsel<='0';
power<='1';
else
nextstate<=ready;
end if;

when poweron=>
if powercount=2000 then
nextstate<=halfrise;
else
nextstate<=poweron;
end if;

when poweroff=>
if powercount>2000 then
endflag<='1';
power<='0';
nextstate<=ready;
test1<='0';
else
nextstate<=poweroff;
end if;

when halfrise=>
if count=249 then
dactemp<="1111111111";
nextstate<=maxvalue;
else
nextstate<=halfrise;
dactemp<="1000000000";
end if;

--2
when maxvalue=>
trigerflag<='1';
dactemp<="1111111111";
case cmdstate is
when cmdAck=>
receivetype<="00001";
if not(codenum>3) then
codetemp:=codearray1(codenum);
else
if not(codeindex=18) then
if processdatashift(511)='1' then
codetemp:=504;
else
codetemp:=10;
end if;
else
codetemp:=40000;
addrsel<='1';
nextstate<=newcmd;

end if;
end if;
if count=codetemp then
--dactemp<="1111111111";
if codenum<2 then
nextstate<=fallhalf;
else
if count=40000 then
nextstate<=newcmd;

else
nextstate<=fall;
end if;
end if;
else
nextstate<=maxvalue;
if (count=1140) and (codenum>1) then
finishout<='1';
end if;
if (overtime='1') and (count>2000)then
nextstate<=newcmd;

end if;
end if;

when cmdQueryRep=>

if not(codenum>3) then
codetemp:=codearray1(codenum);
else
if not(codeindex=4) then
codetemp:=10;
else
codetemp:=3600;

nextstate<=newcmd;

end if;
end if;
if count=codetemp then
--dactemp<="1111111111";
if codenum<2 then
nextstate<=fallhalf;
else
if count=3600 then
nextstate<=newcmd;

else
nextstate<=fall;
end if;
end if;
else
nextstate<=maxvalue;
--if (count=1140) and (codenum>1) then
if count=1140 then
finishout<='1';
end if;
end if;

when others=>

receivetype<="00000";
if not(codenum>preamble) then
codetemp:=codearray(codenum);
else
if not(codeindex=bitlength) then
if shifttemp(15)='1' then
codetemp:=504;
else
codetemp:=10;
end if;
else
codetemp:=3600;
addrsel<='1';
nextstate<=newcmd;

end if;
end if;
if count=codetemp then

--dactemp<="1111111111";
if codenum<2 then
nextstate<=fallhalf;
else

if count=3600 then
nextstate<=newcmd;
else
nextstate<=fall;
end if;
end if;
else
nextstate<=maxvalue;
if (count=1140) and (codenum>1) then
finishout<='1';
end if;
end if;
end case;

when newcmd=>

saveflag<='1';
finishout<='0';
--下面这部分本来是延时关闭调制,现在程序并非发了QUERY就关闭,所以要以后再补充完善,现在继续发其他命令
--if count>39999 then
-- if savestate=maxvalue then
-- nextstate<=fallhalf;
-- else
-- nextstate<=risehalf;
-- end if;
--else
--test1<=not test1;
--1008if (newcmdexecd='1') and (not(cmdstate=cmdAck)) then

if savestate=maxvalue then
nextstate<=fallhalf;
dactemp<="1111111111";
else
nextstate<=risehalf;
dactemp<="0000000000";
--test0<='0';
end if;

if (newcmdexecd='1')then
--test0<=not test0;
--if not (cmdstate=cmdACK) then
-- trigerflag<='0';
-- test0<='0';
--else
trigerflag<='1';
--test0<='1';
--end if;
--test0<='0';
--if not(cmdstate=cmdAck)then

--原来执行完ACK关闭RF调制，现在改为执行QUERYREP命令

--nextstate<=fallhalf;

else
nextstate<=newcmd;
end if;
--end if;

--3
when fallhalf=>
if count=249 then
dactemp<="1000000000";
if codeindex=bitlength then
nextstate<=halfvalue;
else
nextstate<=halfvalue;
end if;
else
dactemp<="1000000000";
nextstate<=fallhalf;
end if;

--4
when halfvalue=>
dactemp<="1000000000";
--if trigerflag='0' then
if powerflag='1' then
--if codeindex=bitlength then
-- nextstate<=halfvalue;
--else
if count=91 then --217
dactemp<="1000000000";
--if prestate=fallhalf then
if prestate='1'then
nextstate<=halffall;
else
nextstate<=halfrise;
end if;
else
nextstate<=halfvalue;
end if;
--end if;
else
nextstate<=poweroff;
end if;
--5
when halffall=>
if count=249 then
dactemp<="0000000000";
nextstate<=minvalue;
else
dactemp<="1000000000";
nextstate<=halffall;
end if;

--6
when minvalue=>
trigerflag<='1';
dactemp<="0000000000";
case cmdstate is
when cmdAck=>
receivetype<="00001";
if not(codenum>3) then
codetemp:=codearray1(codenum);
else
if not(codeindex=18) then
if processdatashift(511)='1' then
codetemp:=504;
else
codetemp:=10;
end if;
else
codetemp:=40000;
addrsel<='1';
nextstate<=newcmd;

end if;
end if;
if count=codetemp then
--dactemp<="0000000000";
if codenum<2 then
nextstate<=risehalf;
else
if count=40000 then
nextstate<=newcmd;

else
nextstate<=rise;
end if;
end if;
else
nextstate<=minvalue;
if (count=1140) and (codenum>1) then
finishout<='1';
end if;
if (overtime='1') and (count>2000)then
nextstate<=newcmd;

end if;
end if;

when cmdQueryRep=>

if not(codenum>3) then
codetemp:=codearray1(codenum);
else
if not(codeindex=4) then
codetemp:=10;
else
codetemp:=3600;
nextstate<=newcmd;

end if;
end if;

if count=codetemp then
--dactemp<="0000000000";
if codenum<2 then
nextstate<=risehalf;
else
if count=3600 then
nextstate<=newcmd;

else
nextstate<=rise;
end if;
end if;
else
nextstate<=minvalue;
if count=1140 then
finishout<='1';
end if;
end if;

when others=>
--when cmdQuery=>

receivetype<="00000";
if not(codenum>preamble) then
codetemp:=codearray(codenum);
else
if not(codeindex=bitlength) then
if shifttemp(15)='1' then
codetemp:=504;
else
codetemp:=10;
end if;
else
codetemp:=3600;
addrsel<='1';
nextstate<=newcmd;

end if;
end if;
if count=codetemp then
--dactemp<="0000000000";
if codenum<2 then
nextstate<=fallhalf;
else
if count=3600 then
nextstate<=newcmd;

else
nextstate<=rise;
end if;
end if;
else
if (count=1140) and (codenum>1) then
finishout<='1';
end if;
nextstate<=minvalue;
end if;
end case;

--7
when rise=>
if count=489 then
dactemp<="1111111111";
nextstate<=maxvalue;
else
dactemp<="1000000000";
nextstate<=rise;
end if;

--8
when fall=>
if count=489 then
dactemp<="0000000000";
nextstate<=minvalue;
else
dactemp<="1000000000";
nextstate<=fall;
end if;

--9
when risehalf=>
dactemp<="1000000000";
if count=249 then
if codeindex=bitlength then
nextstate<=halfvalue;
else
nextstate<=halfvalue;
end if;
else
nextstate<=risehalf;
end if;

when others=>
----test0<='0';
dactemp<="1000000000";
nextstate<=ready;
end case;
end if;
END PROCESS;

process (CLK,RESET,testclkcount)
begin
if reset='1' then
iqstate<='0';
DACOUT<="1000000000";
else
if falling_edge(clk) then
--test1<=not test1;
--DACOUT<=conv_std_logic_vector(testclkcount,8);
--DACTEST<=DACOUTQ;
case iqstate is
when '0'=>
DACOUT<=DACOUTI;
DAC01OUT<=DACOUTI(1 downto 0);
--DACOUT<=DACOUTQ;
when others=>
DACOUT<=DACOUTQ;
DAC01OUT<=DACOUTQ(1 downto 0);
end case;
iqstate<=not iqstate;
end if;
end if;
end process ;

只看该作者 · 2012-3-30 11:43

上面是比较老的两段式状态机后来感觉难以维护,重写成一段式的.估计大家看了头晕吧.要维护会昏了.呵呵

只看该作者 · 2012-3-30 11:58

最怕的就是维护你这样的代码了……

只看该作者 · 2012-3-30 12:09

:dizzy:

只看该作者 · 2012-3-30 14:04

这种代码看到就头晕

只看该作者 · 2012-3-30 14:57

工艺不同
cpld大多为flash，无需片外存储芯片，安全性较高。
FPGA有三种工艺：SRAM，flash，反熔丝
只在SRAM的安全性较差，容易被人**外，其主要原因是需片外存储芯片，在上电时容易被人劫配置的bit流。其他两种也无需片外存储芯片，安全性好，反熔丝的安全性最高，但只能一次烧写，不能多次配置。

只看该作者 · 2012-3-30 14:59

5# mr.king
状态机建意二段，或三段，代码在具有可读性，可维护性，不是写给哪个一个人看的。

只看该作者 · 2012-3-30 19:38

为什么ALTERA不把配置芯片做到FPGA内部去呢？搞不明白。

只看该作者 · 2012-3-30 19:43

应该是外部可以接串行或者并行的器件来配置吧我设计的两款1152个引脚的FPGA开发板都是外面加一个就可以了

只看该作者 · 2012-3-30 19:55

不用加密算法保密的FPGA基本上非常容易**和克隆，xilinx有篇**wp267讲的很清楚，5年前就总结了很多种**方法以及应对方法，现在的**技术应该更先进了，相应的防护技术也应更先进才对，3DES是入门级的，xilinx自带的bit流加密，估计没多大用处，据说V5的bit流加密可以**了，AES配合ICAP动态加载应该成为主流，但这种方法还是有**可能。