- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377001 > DSP56600 (飛思卡爾半導(dǎo)體(中國)有限公司) Implementing Viterbi Decoders Using the VSL Instruction on DSP Families PDF資料下載
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： | 維特比解碼器實現(xiàn)上使用DSP的家庭教學(xué)的VSL |
| 文件頁數(shù)： | 52/108頁 |
| 文件大?。?/td> | 726K |
| 代理商： | DSP56600 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁當前第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁
4-4
Viterbi Decoder Implementation
For More Information On This Product,
Go to: www.freescale.com
Algorithmic Extensions
Allowing More General Branch Metrics
4.2.1
Modify Viterbi Butterfly
Begin modification with the butterfly loop. The code from
Section 3
reads in the branch
metric from y memory near the loop end (the y:(r0)+,y1 that appears two lines
from _P_NextStage). The easiest way to get two branch metrics is to do long reads on the
branch metrics. For the code in
Section 3
, however, finding the space to do the extra
branch read is harder. Most of the data movement is tightly controlled and cannot be
moved in the code without disrupting the data flow. Instead, we can make use of the
pipeline stall in the Viterbi butterfly loop. The modified code appears in
Example 4-1
.
Example 4-1
Modified Viterbi Butterfly
;*******************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
;
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
F
Freescale Semiconductor, Inc.
n
.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DSP56852E | 16-bit Digital Signal Controllers |
| DSP56852VFE | 16-bit Digital Signal Controllers |
| DSP56853E | 16-bit Digital Signal Controllers |
| DSP56853FG120 | 16-bit Digital Signal Controllers |
| DSP56853FGE | 16-bit Digital Signal Controllers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DSP56600AD | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:INTERGRATED CELLULAR BASEBAND PROCESSOR DEVELOPMENT IC |
| DSP56600FM | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:16-BIT DIGITAL SIGNAL PROCESSOR |
| DSP56602 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:16-Bit Digital Signal Processor User manual |
| DSP56602AD | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:16-Bit Digital Signal Processor User manual |
| DSP56602DS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DSP56602 16-Bit Digital Signal Processor Datasheet |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。