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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) 86 Page - Freescale Semiconductor, Inc |
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DSP56300 датащи(HTML) 86 Page - Freescale Semiconductor, Inc |
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86 / 108 page  B-8 Viterbi Decoder Implementation Extended Algorithm Program Listing ;***********************STORE PARTIAL PATH METRICS MACRO*************** ; FUNCTION: The storage is somewhat twisted. The stored paths are ; current up to the most recent input bit, which is NOT ; convenient for traceback. As a result, I process the data as ; follows: I preloaded the path with 6 bits. Thereafter, I ; process 8 path bits so the path has 14 bits. The most ; significant 8, I save. The remaining bits are the current ; encoder values for that path. The 5 lsb's are the current ; state. ; INPUTS: ; n0 should point to memory where the path bits are to be stored ; r5 should point to the latest path metric for state 0 ; OUTPUTS: ; Updated paths storage X memory, n0 points to next path storage ; REGISTERS USED: ; a,b,y1,r0,n0,r3,r5 ;********************************************************************* ; ; Store off path data in bytes to avoid overflow in path reg's ; STOREPATHS macro LPCNT ; move n0,r3 ;n0 stores path data pointer move n0,r0 move #>$1f,y1 ;mask for 5 lsb's(NUMENCBITS-1 of 1's) do LPCNT,_PSTORE1 ;store paths for each state move y:(r5),b ;grab path asr #5,b,a ;align bits 5-12 w/ a1 (8 bits beyond enc) and y1,b ;mask off 5 lsb's to return to path move a1,x:(r3)+ ;store 8 ms path bits move b1,y:(r5)+ ;return 5 ls path bits _PSTORE1 lua (R4+NUMSTATES),R5 ;r5 points to latest states lua (r0+NUMSTATES),n0 ;update path data pointer endm 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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