參數(shù)資料
型號: 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,以擴展實例
文件頁數(shù): 44/48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
44
Freescale Semiconductor
References
[ clr d2
move.l (sp-n_off),r5 move.l (sp-n_off),d5
]
clr d3
asla r5
sub d5,d4,d5
adda r2,r5
adda #-z_exp_off,sp,r9
move.l #T,d4
doensh3 d5
; r5 -> z[n]
; r9 -> z_exp[0]
loopstart3
LLLABEL
move.w d2,(r5)+
loopend3
; fill in the z_exp array (r9) from the z array (r2).
; Cycle count ~ 4 + (T/2)*4 = 20 (worst case)
tfra r14,r12
moveu.w (r2)+,r3
addl1a r3,r13
moveu.w (r2)+,r4
moveu.w (r13),d3
tfra r14,r13
doen3 #T/2
dosetup3 LOOP_ON_Z
loopstart3
LOOP_ON_Z
tfra r14,r12
moveu.w (r2)+,r3
move.w d3,(r9)+
moveu.w (r2)+,r4
move.w d4,(r9)+
tfra r14,r13
addl1a r4,r12
addl1a r3,r13
moveu.w (r12),d4
moveu.w (r13),d3
loopend3
move.w d4,(r9)+
move.w d3,(r9)
; Forney_b
adda #-4,sp,r6
move.w #0,(r6)
; needed because of using
; software pipeline in kernel
move.l #_exp_table_for_syndrome,r8
; r8->exp_table_for_syndrome[0]
adda #-z_exp_off,sp,r9
tfra r15,r14
move.l (sp-rp_off),r11
adda #-t_nomden_off,sp,r3
tfra r3,r13
adda #2,r14
; r9->z_exp[0]
; r14->elp[0]
; r11->rp[0]
; r3->t_nomden[0]
; r3,r13 -> t_nom_den[0]
; r14->elp[1]
move.w #(N+1),n0
move.w #2,n1
dosetup2 LOOP1
dosetup3 LOOP2
move.l (sp-n_off),d0
doen2 d0
moveu.l #_exp_2_bin_extended,d15
tfra r8,r0
moveu.w (r11)+,r7
; r0->syndrome[0][0]
; r7=rp[0]
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