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)展實例
文件頁數(shù): 24/48頁
文件大?。?/td> 306K
代理商: AN2407
Reed Solomon Encoder/Decoder on the StarCore SC140/SC1400 Cores, With Extended Examples, Rev. 1
24
Freescale Semiconductor
References
;* OUTPUT: r1 : BYTE syndromes[2*T] *
;* 2T syndromes *
;*******************************************************************************
;* *
;* FUNCTION : Evaluates 2T syndromes defined as evaluating the *
;* received block viewed as a polynomial over GF(256) at field *
;* points alpha, alpha^2 ... alpha^2T. *
;* *
;* *
;* PERFORMANCE: Average cycle count = 5772 *
;* Worst case cycle count = 5894 *
;* *
;* ALIGNMENT REQUIREMENTS: *
;* *
;* &received_block[0] should be aligned 8 *
;* &syndromes[0] should be aligned 8 *
;* *
;*******************************************************************************
section .text local
TextStart_calculate_syndrome
; Define macros
N equ 256
TT equ 16
; Allocate space for the local variables on stack pointer
allocation equ 536
block_off
temp2_off
temp3_off
temp4_off
temp5_off
temp6_off
temp7_off
temp8_off
equ allocation-0
equ block_off-2*N
equ temp2_off-4
equ temp3_off-4
equ temp4_off-4
equ temp5_off-4
equ temp6_off-4
equ temp7_off-4
global _calculate_syndrome
align 16
opt lpa
_calculate_syndrome typefunc
; Overhead
START_SYNDROME
push d6
push r6
push d7
push r7
adda #allocation,sp,r6
tfra r6,sp
adda #-block_off,sp,r10
adda #-temp2_off,sp,r2
adda #-temp3_off,sp,r3
adda #-temp4_off,sp,r4
adda #-temp5_off,sp,r5
adda #-temp6_off,sp,r6
adda #-temp7_off,sp,r7
adda #-temp8_off,sp,r8
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