AN2254 Freescale Semiconductor / Motorola, AN2254 Datasheet - Page 16

• Manufacturer Part Number: AN2254
• Description: Scrambling Code Generation for WCDMA
• Manufacturer: Freescale Semiconductor / Motorola

Results
4
The plots in Figure 4 and Figure 5 show the corresponding Matlab and StarCore DSP results for the complex
scrambled signal. As these figures indicate, the StarCore DSP and the Matlab results agree.
16
Results
Scrambling Code Generation for WCDMA on the StarCore™ SC140/SC1400 Cores, Rev. 1
to
;-------------------code and scaling to preserve the energy of the constellation----------
------
;----------------------------end of code to preserve energy of constellation--------------
------
memory
endsec
mpy d0,d4,d8
mpy d0,d5,d9
mpy d2,d6,d10
mpy d2,d7,d11
]
[
mac -d1,d5,d8
mac d1,d4,d9
mac -d3,d7,d10
mac d3,d6,d11
move.4f (r0)+,d0:d1:d2:d3
move.4f (r4)+,d4:d5:d6:d7
]
[
mpy d15,d8,d8
mpy d15,d9,d9
mpy d15,d10,d10
mpy d15,d11,d11
]
[
asl d8,d8
asl d9,d9
asl d10,d10
asl d11,d11
]
loopend1
moves.4f d8:d9:d10:d11,(r2)+
[
pop r6
pop r7
]
[
pop d6
pop d7
]
rts
;//(DI*SI) part from eqn. 16, 1st sample
;//(DI*SQ) part from eqn. 16, 1st sample
;//(DI*SI) part from eqn. 16, 2nd sample
;//(DI*SQ) part from eqn. 16, 2nd sample
;//(-(DQ*SQ)) part from eqn. 16, 1st sample
;//(DQ*SI) part from eqn. 16, 1st sample
;//(-(DQ*SQ)) part from eqn. 16, 2nd sample
;//(DQ*SI) part from eqn. 16, 2nd sample
;//move 2 input IQ samples from memory to data
;//registers
;//move 2 scrambling IQ code samples from memory
;//data registers
;//(1/sqrt(2)) x (scrambled output I), 1st sample
;//(1/sqrt(2)) x (scrambled output Q), 1st sample
;//(1/sqrt(2)) x (scrambled output I), 2nd sample
;//(1/sqrt(2)) x (scrambled output Q), 2nd sample
;//output I scaling factor change from 4 to 2, 1st
;//sample
;//output Q scaling factor change from 4 to 2, 1st
;//sample
;//output I scaling factor change from 4 to 2, 2nd
;//sample
;//output Q scaling factor change from 4 to 2, 2nd
sample
;//move 2 complex scrambled IQ samples into
;//buffer
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