Texas Instruments TMS320C64X Manual do Utilizador descarregar pdf (Página 71)

DSP_fir_gen

4-43 C64x+ DSPLIB Reference

Special Requirements

- The number of coefficients, nh, must be greater than or equal to 5.

Coefficients must be in reverse order.

- The number of outputs computed, nr, must be a multiple of 4 and greater

than or equal to 4.

- Array r[ ] must be word aligned.

Implementation Notes

- Bank Conflicts: No bank conflicts occur.

- Interruptibility: The code is interrupt-tolerant but not 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: Not available

Codesize: Not available

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Texas Instruments TMS320C64X Manual do Utilizador Página 71