參數(shù)資料
型號: AN2407
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: Reed Solomon Encoder/Decoder on the StarCore SC140/SC1400 Cores, With Extended Examples
中文描述: 里德所羅門編碼器/的StarCore SC140/SC1400核心解碼器,以擴(kuò)展實(shí)例
文件頁數(shù): 23/48頁
文件大?。?/td> 306K
代理商: AN2407
References
Reed Solomon Encoder/Decoder on the StarCore SC140/SC1400 Cores, With Extended Examples, Rev. 1
Freescale Semiconductor
23
for (i=1; i<n; i++)
{
temp = s[i] ^ el[i+1];
for (j=0; j<i; j++)
{
y_power = bin_2_exp[s[i-j-1]];
power = MIN((elp[j+1] + y_power),2*N+1);
temp ^= exp_2_bin_extended[power];
}
z[i] = bin_2_exp[temp];
}
for (i=0; i<n; i++)
{
nom = 0x01;
denom = 0x00;
for (j=0; j<n; j++)
{
x_power = exp_table_for_syndrome[j][roots[i]];
power = MIN(x_power + z[j],2*N+1);
nom ^= exp_2_bin_extended[power];
}
for (j=1; j<=n; j+=2)
{
x_power = exp_table_for_syndrome[j-1][roots[i]];
power = MIN(x_power + elp[j],2*N+1);
denom ^= exp_2_bin_extended[power];
}
x_power = bin_2_exp[nom];
y_power = N - bin_2_exp[denom];
power = MIN(x_power + y_power,2*N+1);
block[err_locs[i]] ^= exp_2_bin_extended[power];
}
}
Appendix B:
Assembly Codes for Decoder
Example 6.
Assembly Code for Syndromes Calculation
;;******************************************************************************
;* *
;* Reed-Solomon error correction algorithm *
;* *
;* STARCORE 140 ASSEMBLY
;* *
;*******************************************************************************
;* *
;* Module Name: calculate_syndrome.asm *
;* *
;*******************************************************************************
;* *
;* Calling convention from C: calculate_syndrome(received_block, syndromes) *
;* *
;*******************************************************************************
;* *
;* INPUT: r0 : BYTE received_block[N+1] *
;* Received block of 256 bytes, zero-extended by one byte *
;* *
*
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