參數(shù)資料
型號: AN2407
廠商: 飛思卡爾半導體(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,以擴展實例
文件頁數(shù): 42/48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
42
Freescale Semiconductor
References
move.l (sp-n_off),d15
sub #1,d15
asrr #2,d15
inc d15
; m in d15 now, elp in (sp-elp_off), temp in r3
adda #-4,sp,r7
move.w #0,(r7)
adda #2*T,r9
dosetup2 OUTER_LOOP
tfr d15,d0
doen2 d0
dosetup3 INNER_LOOP
adda #-z_off,sp,r2
move.l #_exp_2_bin_extended,r3
tfra r9,r10
; r9 -> temp[T]
; m -> d0
; r2->z[0]
tfra r1,r15
; r10 -> temp[T]
; r15 -> elp[0]
moveu.w (r1)+,d7
clr d3
move.w #(2*N+1),d0
tfr d0,d1
; r8 ->elp[1]
tfr d0,d2
loopstart2
OUTER_LOOP
[ clr d8
clr d9
; sum[0..3]=0
clr d10
clr d11
doen3 #(T+1)
move.4w (r10),d12:d13:d14:d15 ; load temp[T+0..3]
]
; denote:t0...t3 =
temp[T+0...3]
[ add d7,d12,d4
add d7,d14,d6
suba #2,r10
]
add d7,d13,d5
; pow0,1=x_pow+t0,1
; pow2=x_pow+t2
; r10->temp[T-1]
adda #-4,sp,r7
loopstart3
INNER_LOOP
;1
[ eor d3,d10
min d1,d5
moveu.b (r7),d3
]
min d0,d4
add d7,d15,d15
moveu.w (r1)+,d7
; sum2^=sum -> d10
; pow1=min(pow1,2*N+1) -> d5
; load bin_2_exp[pow3] -> d3
pow0 = min(pow0,2*N+1) -> d4
pow3=x_pow+t3 -> d15
load x_pow=elp[j+1] -> d7
;2
[ eor d3,d11
tfr d15,d4
move.l d4,r4
]
min d2,d6
move.l d5,r5
;
;
;
sum3^=sum3 -> d11
copy d15 into d4
pow0 = min(pow0,2*N+1) -> r4
pow2=min(pow2,2*N+1) -> d6
pow1=min(pow1,2*N+1) -> r5
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