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DSP56300 Datasheet(PDF) 37 Page - Freescale Semiconductor, Inc

No. de pieza DSP56300
Descripción Electrónicos  Implementing Viterbi Decoders Using the VSL Instruction on DSP Families
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Fabricante Electrónico  FREESCALE [Freescale Semiconductor, Inc]
Página de inicio  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

DSP56300 Datasheet(HTML) 37 Page - Freescale Semiconductor, Inc

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Expanding the Viterbi Algorithm
Creating the Branch Metrics
Viterbi Decoder Implementation
3-9
Example 3-2
Find Branch Metrics Code
;*****************BRANCH METRIC MACRO*************************************
;
FUNCTION: Input data and generate branch metrics.
;
For this decoder, the metric is a scaled
;
sum or difference of the real and imag inputs.
;
INPUTS:
;
r2 should point to the beginning of the branch metric table
;
r5 should point to the latest path metric for state 0
;
r1 should point to the next input XY data pair
;
OUTPUTS:
;
Branch metrics are stored at BRX in XY memory
;
REGISTERS USED:
;
a,b,x01,y01,r1,r2,n2, r2 unchanged (modulo req'd)
;****************************************************************
;
FindMetrics
macro
move
l:(r1)+,y
;grab dec input
move
#-16,x1
;sign for real component, 0 sent.
mpy
x1,y1,a
;a has 0x partial branch
move
#BRY+3,r2
;storage for generated branch metrics
mac
x1,y0,a
a,b
;a gets 00 branch
mac
-x1,y0,b
;b has 01 branch
;
neg
a
a,x1
a,y:(r2)+n2 ;mv 00 to x1,11 to a, st 00 in location 3
neg
b
b,x0
b,y:(r2)+n2 ;mv 01 to x0,10 to b, st 01 in location 6
;*****************************************************************************
;
AT this point X1 has 00, X0 has 01,
;
A1 has 11, B1 has 10, needed for quick storage in Y memory
;*****************************************************************************
move
x1,y:(r2)+n2
;store 00 in location 9
move
x0,y:(r2)+n2
;store 01 in location 12
move
b,y:(r2)+n2
;store 10 in location 15
move
b,y:(r2)+n2
;store 10 in location 2
move
b,y:(r2)+n2
;store 10 in location 5
move
b,y:(r2)+n2
;store 10 in location 8
move
x0,y:(r2)+n2
;store 01 in location 11
move
x1,y:(r2)+n2
;store 00 in location 14
move
x0,y:(r2)+n2
;store 01 in location 1
move
x1,y:(r2)+n2
;store 00 in location 4
move
a,y:(r2)+n2
;store 11 in location 7
move
a,y:(r2)+n2
;store 11 in location 10
move
a,y:(r2)+n2
;store 11 in location 13
move
a,y:(r2)
;store 11 in location 0. r2-> BRY
endm
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com


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