Atmel Evaluation Kit AT91SAM9X25-EK AT91SAM9X25-EK Data Sheet
Product codes
AT91SAM9X25-EK
353
SAM9X25 [DATASHEET]
11054E–ATARM–10-Mar-2014
{
if (k == 0)
dmu[i+1] = si[2*(i-1)+3];
/* check if one operand of the multiplier is null, its index is -1 */
else if (smu[i+1][k] && si[2*(i-1)+3-k])
dmu[i+1] = gf_antilog[(gf_log[smu[i+1][k]] + gf_log[si[2*(i-1)+3-k]])%nn]
^ dmu[i+1];
}
}
return 0;
}
27.5.3 Find the Error Position
The output of the get_sigma() procedure is a polynomial stored in the smu[NB_ERROR+1][] table. The error position is
the roots of that polynomial. The degree of this polynomial is very important information, as it gives the number of errors.
The PMERRLOC module provides a hardware accelerator for this step.
the roots of that polynomial. The degree of this polynomial is very important information, as it gives the number of errors.
The PMERRLOC module provides a hardware accelerator for this step.