| 摘要 |
PURPOSE:To realize compatibility between high speed property and a small hardware quantity, by using a specific symbol on a result in which the output of a memory where a degree calculated result is stored is multiplied by a fixed coefficient. CONSTITUTION:The symbol in which an even-th bit from the low-order of a binary vector is 0 and an odd-th bit from the low-order is 1 is used as a multiplicand for the result in which a memory output where respective degree calculated result from oth-order to (t)th-order of an error position polinomial is stored is multiplied by the fixed coefficients from alpha<o> to alpha<t> respectively. In such a way, a bit component corresponding to the even square of (alpha) out of the outputs of fixed coefficient multiplier groups 1-8 goes to 0, and the exclusive OR of the multiplied result of only the fixed multiplier of odd square of (alpha) is taken, and it is possible to find a result X.sigma (X) that is the result obtained by substituting an error position in the polynomial where the error position polynomial is differentiated easily without performing specific calculation.
|
