DSP_fir_gen_hM17_rA8X8

Special Requirements

-The number of coefficients, nh, must be greater than or equal to 17. Coefficients must be in reverse order.

-The number of outputs computed, nr, must be a multiple of 8 and greater than or equal to 8.

-Array r[ ] must be word aligned.

Implementation Notes

 

- Bank Conflicts: No bank conflicts occur.

 

- Interruptibility: The code is fully interruptible.

 

- Load double-word instruction is used to simultaneously load four values

 

in a single clock cycle.

 

- The inner loop is unrolled four times and will always compute a multiple

 

of 4 of nh and nr. If nh is not a multiple of 4, the code will fill in zeros to make

 

nh a multiple of 4.

 

- This code yields best performance when the ratio of outer loop to inner

 

loop is less than or equal to 4.

Benchmarks

Cycles: 3*ceil(nh/4)*nr/4+39

 

Codesize: 416 bytes

C64x+ DSPLIB Reference

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Image 73
Texas Instruments TMS320C64X manual Cycles 3*ceilnh/4*nr/4+39