CIRCULAR BUFFER IN SECOND-GENERATION DSP'S

Third and fourth generation DSPs (TMS320C3x/4x) include a circular buffer addressing mode. The second generation DSPs (TMS320C2x) do not. The integer TMS320 devices make the use of a circular buffer unnecessary because they can perform data movement simultaneously with arithmetic processing, with no penalty to code size or execution time. This is very efficient because it circumvents the overhead of maintaining a buffer pointer. However, some applications still benefit from circular buffers.

The TMS320C25 can manipulate circular buffer pointers without penalty to code size or execution time. This document discusses how to implement this, and describes how this techniques works for a TMS320C25.

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