Texas Instruments TMS320C64X Manual do Utilizador descarregar pdf (Página 75)

DSP_fir_r4

4-47 C64x+ DSPLIB Reference

Special Requirements

- The number of coefficients, nh, must be a multiple of 4 and greater than

or equal to 8. 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.

Implementation Notes

- Bank Conflicts: No bank conflicts occur.

- Interruptibility: The code is interrupt-tolerant but not interruptible.

- The 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 output samples.

Benchmarks Cycles (8 + nh) * nr/4 + 9

Codesize 308 bytes

1 2 ... 70 71 72 73 74 75 76 77 78 79 80 ... 168 169

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Texas Instruments TMS320C64X Manual do Utilizador Página 75