TMS320F280049M_17 Datasheet, PDF (187/214 Pages) Texas Instruments – Piccolo Microcontrollers

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TMS320F280049M
SPRS945 – JANUARY 2017
• Complex math
Complex math is used in many applications; a few of which are:
– Fast fourier transform (FFT)
The complex FFT is used in spread spectrum communications, as well as many signal processing
algorithms.
– Complex filters
Complex filters improve data reliability, transmission distance, and power efficiency. The
C28x+VCU can perform a complex I and Q multiply with coefficients (four multiplies) in a single
cycle. In addition, the C28x+VCU can read/write the real and imaginary parts of 16-bit complex data
to memory in a single cycle.
Table 6-8 lists a summary of a few complex math operations enabled by the VCU.
COMPLEX MATH OPERATION
Add or Subtract
Add or Subtract
Multiply
Multiply and Accumulate (MAC)
RPT MAC
Table 6-8. Complex Math Performance
VCU CYCLES
1
1
2p
2p
2p+N
NOTES
32 ± 32 = 32-bit (Useful for filters)
16 ± 32 = 15-bit (Useful for FFT)
16 × 16 = 32-bit
32 + 32 = 32-bit, 16 × 16 = 32-bit
Repeat MAC. Single cycle after the first operation.
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