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(mén)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)： 40/48頁(yè)
文件大?。?/td> 306K
代理商： AN2407
Reed Solomon Encoder/Decoder on the StarCore SC140/SC1400 Cores, With Extended Examples, Rev. 1
40
Freescale Semiconductor
References
;* Calling convention from C: *
;* forney(syndromes,error_loc_poly, n_roots,error_locations, *
;* roots_poly,received_block) *
;* *
;*******************************************************************************
;* *
;* INPUT: r0 : BYTE syndromes[2*T] *
;* 2T syndromes *
;* r1 : WORD error_loc_poly[2*T] *
;* Error location polynomial in exponential form *
;* (sp-28) : DWORD n_roots *
;* Number of roots *
;* (sp-32) : BYTE error_locations[T] *
;* (sp-36) : WORD roots_poly[2*T] *
;* Error locations *
;* Exponents of the roots *
;* (sp-40) : BYTE received_block[N] *
;* Received block *
;* *
;* OUTPUT: (sp-40) : BYTE received_block[N] *
;* Corrected block *
;* *
;*******************************************************************************
;* FUNCTION : Deriving the error location polynomial by Berlekamp’s iterative *
;* algorithm. This is a compiled code which has been slightly *
;* modified by applying software pipelining applied and efficient *
;* register allocation. *
;* 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: *
;* *
;* #errors = 0 -> 0 cycles *
;* #errors = 1 -> 259 cycles *
;* #errors = 2 -> 295 cycles *
;* #errors = 3 -> 331 cycles *
;* #errors = 4 -> 368 cycles *
;* #errors = 5 -> 476 cycles *
;* #errors = 6 -> 512 cycles *
;* #errors = 7 -> 548 cycles *
;* #errors = 8 -> 587 cycles *
;* *
;* ALIGNMENT REQUIREMENTS: *
;* *
;* &syndromes[0] should be aligned 8 *
;* &error_loc_poly[0] should be aligned 8 *
;* &error_locations should be aligned 8 *
;* &roots_poly[0] should be aligned 8 *
;* &received_block[0] should be aligned 8 *
;* *
;*******************************************************************************
; Define macros
N equ 255
T equ 8
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