參數(shù)資料
型號: DSP56600
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: Implementing Viterbi Decoders Using the VSL Instruction on DSP Families
中文描述: 維特比解碼器實(shí)現(xiàn)上使用DSP的家庭教學(xué)的VSL
文件頁數(shù): 98/108頁
文件大?。?/td> 726K
代理商: DSP56600
C-6
Viterbi Decoder Implementation
For More Information On This Product,
Go to: www.freescale.com
24-Bit Algorithm Program Listing
;*******************viterbi add, compare, select butterfly macro***
;
FUNCTION: Update path metrics/paths for the Viterbi algorithm by
;
doing an add,compare,select update for state pairs.
;
INPUTS:
;
r2 should point to the beginning of the branch metric table
;
r5 should point to the latest path metric for state 0
;
r4 should point to the storage location for updated state 0
;
n5 should offset addresses by NUMSTATES/2
;
OUTPUTS:
;
Updated path metrics/paths stored in XY memory
;
REGISTERS USED:
;
a,b,y01,r2,r4,r5,n5 r2 unchanged (modulo req'd)
;
Registers:
;
r5, pointer to the path metric/path table, arranged as
;
x: path metric, y: path,states ordered assuming
;
bits shift right to left.
;
r4, pointer to the output path metric/path table
;
r0, pointer to the branch metric table, arranged
;
as x:C, y:D, CD,CD,CD, etc.
;
;
SA------NSA
;
\ C /
;
D \ /
;
\/
;
/\
;
D / \
;
/ \
;
SB------NSB
;
C
;*****************************************************************
;
ACS
macro
;
;
move
#BRY,r2
move
l:(r2)+,y
move
l:(r5)+n5,a
;
do
#NoAcs,_P_NextStage
add
y0,a
l:(r5)-n5,b
add
y1,b
max
a,b
l:(r5)+n5,a
vsl
b,0,l:(r4)+
add
y1,a
l:(r5)-n5,b
add
y0,b
(r5)+
max
a,b
l:(r5)+n5,a
move
l:(r2)+,y
vsl
b,1,l:(r4)+
_P_NextStage
nop
endm
;r2 points to branch metrics
;get first branch metric
;load 1st metric/path pair
;update each state
;get next pair
;update metrics
;reload 1st pair
;end top half
;reload next pair
;inc st ptr
;load next pair
;load next branch metrics
;end 2nd half
;needed to separate do loop ends
Example C-1
24-bit Algorithm Program Listing (Continued)
F
Freescale Semiconductor, Inc.
n
.
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