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): 41/48頁
文件大?。?/td> 306K
代理商: AN2407
References
Reed Solomon Encoder/Decoder on the StarCore SC140/SC1400 Cores, With Extended Examples, Rev. 1
Freescale Semiconductor
41
allocation
n_off
err_locs_off
rp_off
r_off
equ 104
equ allocation+28
equ allocation+32
equ allocation+36
equ allocation+40
z_off
z_exp_off
temp_off
t_nomden_off
equ allocation-0
equ z_off-2*T
equ z_exp_off-2*T
equ temp_off-2*(2*T)
section .data local
global _forney
align 16
opt lpa
_forneytypefunc
push d6
push r6
push d7
push r7
adda #allocation,sp,r6
tfra r6,sp
BEGIN_FORNEY
; fill in the temp array (r3) from the s array (r0)
adda #-temp_off,sp,r3
doensh3 #(T-1)
move.l #_bin_2_exp,r14
move.l #2*N+1,d0
[ clr d1
tfra r14,r12
]
; r3->temp[0]
tfra r3,r9
tfra r14,r13
loopstart3
move.w d0,(r3)+
; temp[0]...[T-2] =
2*N+1
loopend3
moveu.b (r0)+,r5
register
addl1a r5,r12
move.w d1,(r3)+
moveu.w (r12),d5
register
doen3 #T/2
; r5 some temp
dosetup3 LOOP_ON_S
moveu.b (r0)+,r6
; temp[T-1] = 0
; r6 some temp
loopstart3
LOOP_ON_S
tfra r14,r12
moveu.b (r0)+,r5
move.w d5,(r3)+
moveu.b (r0)+,r6
move.w d6,(r3)+
tfra r14,r13
addl1a r6,r12
addl1a r5,r13
moveu.w (r12),d6
moveu.w (r13),d5
loopend3
move.w d5,(r3)+
move.w d6,(r3)
suba #(T+2),r0
; r0 -> s[0]
; Calculate m = (short int) (((n-1) >> 2) + 1);
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