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參數(shù)資料
| 型號(hào)： | AN2407 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國(guó))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(yè)數(shù)： | 35/48頁(yè) |
| 文件大?。?/td> | 306K |
| 代理商： | AN2407 |
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References
Reed Solomon Encoder/Decoder on the StarCore SC140/SC1400 Cores, With Extended Examples, Rev. 1
Freescale Semiconductor
35
;* INPUT: r0 : BYTE roots[N+1] *
;* Table elements -> root candidates *
;* r1 : WORD error_loc_poly[2*T] *
;* Error location polynomial in exponential form *
;* *
;* OUTPUT: (sp-28) : WORD roots_poly[2*T] *
;* Exponents of the roots *
;* (sp-32) : BYTE error_locations[T] *
;* Error locations *
;* d0 : DWORD n_roots *
;* Number of roots *
;* *
;*******************************************************************************
;* *
;* FUNCTION : Find the error locations by evaluating the error location *
;* polynomial at all field points. The error locations are derived *
;* from the exponents of the field elements which are the roots *
;* of the error location polynomial. *
;* *
;* PERFORMANCE: Cycle count = 4128 *
;* *
;* ALIGNMENT REQUIREMENTS: *
;* *
;* &roots[0] should be aligned 8 *
;* &error_loc_poly[0] should be aligned 8 *
;* &roots_poly[0] should be aligned 8 *
;* &error_locations[0] should be aligned 8 *
;* *
;*******************************************************************************
section .text local
TextStart_chien_search
; Define macros
BYTE_SIZE equ 8
N equ 256
T equ 8
; Allocate space for the local variables on stack pointer and calculate offsets
of function arguments
allocation equ 24
roots_off equ allocation+28
err_locs_off equ allocation+32
temp2_off equ allocation-0
temp3_off equ temp2_off-4
temp4_off equ temp3_off-4
temp5_off equ temp4_off-4
temp6_off equ temp5_off-4
temp7_off equ temp6_off-4
temp8_off equ temp7_off-4
global _chien_search
align 16
opt lpa
_chien_search typefunc
; Overhead
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