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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DSP56300 датащи(PDF) 89 Page - Freescale Semiconductor, Inc |
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DSP56300 датащи(HTML) 89 Page - Freescale Semiconductor, Inc |
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89 / 108 page  Extended Algorithm Program Listing Viterbi Decoder Implementation B-11 ;********POSTPROCESSING,LAST 2 INFO BYTES & FLUSH ENCODER BACK TO 0**** ; ; THESE SETUPS SHOULD ACCOMODATE ENCODERS OF 5 TO 8 BITS. ; ENCBITS-1 PREPROCESSED, SO WE HAVE 16-ENCBITS+1 BITS LEFT. ; WE DO ENCODER FLUSHING FOR #ENCBITS-1 BITS. SO WE HAVE ; (16-ENCBITS+1) - ENCBITS+1 DO DO BEFORE FLUSHING. ; NEXT, WE PROCESS THE ENCODER FLUSH BITS, STOPPING TO STORE ; PATHS AS NEEDED. WE STORE AFTER 8 BITS PROCESSED SO THIS MEANS ; STORE PATHS AFTER 16-2*ENCBITS+2 (from nonflush) +8-(16-2*ENCBITS+2) ; (these are the additional flush bits needed before storing paths). ; FINALLY, WE FINISH OUT THE DATA. THE BITS REMAINING ARE: ; 16-ENCBITS+1-(16-2*ENCBITS+2)-(8-(16-2*ENCBITS+2)) ; = 8-ENCBITS. ; ; FOR THIS EXAMPLE, WE NONFLUSH PROCESS ; 6 MORE BITS, THEN FLUSH 2, STORE PATH, THEN FLUSH ; THE LAST THREE TO STATE 0. ; LAST 6 NONFLUSH BITS--- ;********************************************************************** do #16-(2*ENCBITS)+2,LAST6 FindMetrics ACS ; LAST6 ; ; ENCODER FLUSH----- ; move #>NUMSTATES/2,n5 ;flush, process 16,8, 4, then 2, ; then 1 state do #8-(16-(2*ENCBITS)+2),FLSH;process 3 of last five bits to get ; next to last byte FindMetrics ACSFlush ; ACS FLSH STOREPATHS#NUMSTATES/8 ; ; FLUSH THE LAST THREE BITS------ ; do #8-ENCBITS+1,FLSH3 ; do last 3 bits to get last byte ; FindMetrics ACSFlush ; ACS FLSH3 ; TRACEBACK ; FINISH nop Example B-1 Extended Algorithm Program Listing (Continued) Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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