參數(shù)資料
型號(hào): 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): 38/48頁
文件大小: 306K
代理商: AN2407
Reed Solomon Encoder/Decoder on the StarCore SC140/SC1400 Cores, With Extended Examples, Rev. 1
38
Freescale Semiconductor
References
[ min d1,d5
min d3,d7
moveu.b (r3),d13
]
eor d13,d15
min d0,d4
; offset[5+i] -> d5
; offset[7+i] -> d7
; result[2+i] -> d13
result[2+4(i-1)] is added to accumulator
offset[6+i] -> d4
[ add d14,d5,d2
add d14,d7,d3
move.l d15,(r0)+
]
asrw d9,d8
tfr d1,d12
moveu.b (r5),d5
; table index[5+i] -> d2
; table index[4+i] -> d3
; result[1+i] -> d7
sum of exponents[8+i] -> d8
copy 511 into d12
result[4+i] -> d5
[ asll #24,d5
asll #8,d13
moveu.b (r6),d7
]
asll #16,d6
move.l (r0),d15
; result[4+i] -> bits [31:24] of d5 result[3+i] -> bits[23:16] of d6
; result[2+i] -> bits [15:8] of d13
; result[1+i] -> d7
read accumulator of i-th iteration
loopend3
END_LOOP1
suba #16,r2
-> d11
move.w (r1)+,d11
; i-th term of error_loc_poly
aslw d11,d10
loopend2
; Root finding routine. The 256 candidate roots are scanned for zeroes. The
exponent ; of the root is written into r13 and the error location indices into
r14.
dosetup3 FIND_ZEROES
tfra r8,r0
; r0 -> first table element
[ doen3 #N/2-2
clr d0
moveu.b (r0)+,d2
]
clr d1
; roots counter d0 cleared
; root exponent d1 cleared
[ tsteq d2
moveu.b (r0)+,d2
[ ift
inc d0
move.w d1,(r13)+
]
move.b d1,(r14)+
; special case: zero element
[ tsteq d2
inc d1
moveu.b (r0)+,d4
]
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