Conventional DSP Architecture (con’t)

• Market share: 95% fixed-point, 5% floating-point

• Each processor family has dozens of members with different on-chip configurations

  • Size and map of data and program memory
  • A/D, input/output buffers, interfaces, timers, and D/A

• Drawbacks to conventional DSP processors

  • No byte addressing (needed for image and video)
  • Limited on-chip memory
  • Limited addressable memory on fixed-point DSPs, except Motorola 56300 (16 Mw data; 64 Mw program)
  • Non-standard C extensions to support fixed-point data

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