Texas Instruments TMS320C64X - Manual (Page 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