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): 26/48頁(yè)
文件大小: 306K
代理商: AN2407
Reed Solomon Encoder/Decoder on the StarCore SC140/SC1400 Cores, With Extended Examples, Rev. 1
26
Freescale Semiconductor
References
[ asrr #8,d2
add d14,d3,d3
move.l d1,r3
]
insert #8,#1,d2,d5
eor d0,d6
; vector entry [8+i] -> d2 2 x vector entry[7+i] -> d5
; table index[6+i] ->d3
unify result[3+i] and result[4+i] into d6
; table index[4+i] -> r3
[ add d14,d5,d5
move.l d3,r4
]
insert #8,#1,d2,d7
move.l d4,(r10)+
; table index[7+i] ->d5
; table index[6+i] -> r4
2 x vector entry[8+i] -> d7
write results[1+i,2+i] into r10
[ add d14,d7,d7
move.l d5,r5
]
move.l d6,(r10)+
; table index[8+i] ->d7
; table index[7+i] -> r5
write results[3+i,4+i] into r10
loopend3
doen2 #TT
dosetup2 LOOP_ON_ALPHA
move.l #_exp_2_bin_extended,d14
move.l #_exp_table_for_syndrome,r2
tfra r8,r10
move.w #$1ff,d0
dosetup3 LOOP_ON_BLOCK_POLY
tfra r10,r8
move.w #$1ff,d1
loopstart2
LOOP_ON_ALPHA
; For the software pipeline, d2,d3,d4 and d8 are prepared to 1-st iteration
; while d5,d6,d7,d13 are cleared (= i.e. prepared to the 0-th iteration)
[ clr d15
tfra r8,r10
]
doen3 #N/4
; clear accumulator d15
; reset ptr to vector start
[ move.2l (r10)+,d10:d11move.2l (r2)+,d8:d9
d8:d9
]
d10:d11
; table entries [1..4]->
; vector entries [1..4] ->
[ add2 d8,d10
d10:d11
tfr d1,d12
]
add2 d9,d11
; 4 sum of exponents ->
; (to be separated later)
; 511 in d1 and d12
[ zxt.w d10,d5
tfr d1,d7
]
zxt.w d11,d3
asrw d10,d4
; 1-st sum of exponents -> d5
; 3-rd sum of exponents -> d3
; 2-nd sum of exponents -> d4
[ min d1,d5
min d0,d4
]
min d3,d7
asrw d11,d8
; 1-st,3-rd offset -> d5,d7
; 2-nd offset ->d4
; 4-th sum of exponents -> d8
; d4,d8 are now initialized for the inner loop
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