anticrc.vhd

用汇编语言编写得TD中使用得CC和CRC代码

entity anticrc is
  port (antiCRC_inPortmes:in integer32@8;
        antiCRC_inPortsl:in integer32@8;
        antiCRC_outPort:out integer32@8;
        antiCRC_outPortcheck:out integer32@8);
end entity anticrc;
  
architecture C of anticrc is
begin STAN2 "-O2"   
  CODE


int main() 
{
   unsigned int store_data,bi,li,temp;            
   unsigned int judge,buffer_state,res_state,buffer_state1,res_state1;
   integer32 out;                   
   integer32 sigling;
   
  while(1)
  {
    sigling = getantiCRC_inPortsl();
    bi = sigling;	 // bi is the length of the messages bits(including the CRC)
    sigling = getantiCRC_inPortsl();
    li = sigling;       // li is the length of CRC

    if(bi==li)        // if bi==li,it means that there is no message bits arrived,consider the message bits are correct.let out =1.       
    {
	for(temp=0;temp<li;temp++)
	out=getantiCRC_inPortmes();
	out=1;
        putantiCRC_outPortcheck(out);
    }
    else
    {   
        buffer_state=0;buffer_state1=0;
	if(li==8)  res_state=435;
	if(li==12) res_state=7683;
	if(li==16) res_state=2065; 
	if(li==24) { res_state=3; res_state1=396; }
       	for(temp=0;temp<bi;temp++)
      	{    	if(temp<bi-li)
             	{
			out=getantiCRC_inPortmes();         
                	putantiCRC_outPort(out);
                	store_data=(int)out;
	     	}
	    	else
	    	{
			out=getantiCRC_inPortmes();                
			store_data=(int)out;
	    	}
		
		judge=(store_data)^(buffer_state&1); 
		if(judge==1)
		{
			buffer_state^=res_state;
			buffer_state>>=1;
			if(li==16)
				buffer_state^=32768;
			if(li==24)
			{	
				buffer_state1^=res_state1;
				if((buffer_state1&1)==1)
			         	{buffer_state|=32768;}
				buffer_state1>>=1;
			}
		}
		else
		{
			buffer_state>>=1;
			if(li==24)
			{	
				if((buffer_state1&1)==1)
			    	       { buffer_state|=32768;}
				buffer_state1>>=1;
			}
		}
               		
    }         // the end of "for"
                    
             
          if((buffer_state==0)&&(buffer_state1==0))
         {
              out=1;				// if all the states of the registers are "0",then the message bits are correct,let out=1.
              putantiCRC_outPortcheck(out); 
	      
          }
          else                          // if any of the states of the registers is not "0",then the message bits are wrong,let out=0.
          {
              out=0;
              putantiCRC_outPortcheck(out);
          }

    }         // the end of "else"

  }           // the end of "while"
  return 0;
}
  ENDCODE;
end anticrc;