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DIGITAL SIGNAL PROCESSORS

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  1. DIGITAL SIGNAL PROCESSORS

  2. What are Digital Signals? • Digital signals have finite precision in both the time (sampled) and amplitude (quantized) domains.

  3. What are Digital Signal Processors? • Digital Signal Processors are microprocessors optimized to perform digital signal processing tasks.

  4. Uses of DSPs • Telephone: Signal Multiplexing • Military: RADAR • Medicine: MRI • Scientific: Spectral Analysis • Industrial: Oil Prospecting • Commercial: Movie Special Effects

  5. Uses (contd…)

  6. Characteristics of DSPs • Real-time processing • Limited data types (e.g. floating point) • Very Large Instruction Word (VLIW) architecture

  7. Characteristics (contd…) • DSPs are optimized for mathematical calculations (as opposed to data manipulation).

  8. Characteristics (contd…) • Harvard Architecture

  9. Characteristics (contd…) • Specialized registers (e.g. extended precision accumulators) • Onboard fast RAM, ROM, DMA • Massive Parallelism

  10. Floating Point vs. Fixed Point • Advantages of Floating Point: • Precision • Greater Dynamic Range • Shorter Development Time • Better Signal-to-noise Ratio • Disadvantages of Floating Point: • Expensive

  11. Assembly vs. C • Advantages of Assembly • Faster • Requires less memory • Disadvantages of Assembly • Expensive • Hard to maintain • Intimate knowledge of hardware required

  12. Sample DSP: SMJ320C6701 • Military DSP used in munitions guidance, avionics, navigation, electronic countermeasures, anti-submarine warfare, etc.

  13. SMJ320C6701 (contd…) • Up to 1 GFLOPS at 167 MHz • Load/Store architecture • Instructions operate on data in registers

  14. SMJ320C6701 (contd…) • VLIW architecture • IEEE floating point • Double precision 4 cycle throughput • Single precision 1 cycle throughput • Variable length execution packets

  15. SMJ320C6701 (contd…) • CPU

  16. SMJ320C6701 (contd…) • Internal Program Memory • Internal Data Memory • Host Port Interface • Allows other processors access to internal DSP memory.

  17. SMJ320C6701 (contd…) • Multichannel Buffered Serial Port • Allows fast inter-processor communication • Direct Memory Access • Fewer CPU interrupts • External Memory Interface • Glueless interface to SBRAM, SRDRAM and SRAM

  18. Some Signals • CLOCK • CLKIN: clock input • CLKMODE: x4 or x1 output clock f • DMA • DMAC3,2,1,0: DMA action complete • EMIF control • CE3,2,1,0: memory space enables, enabled by bits 24 and 25 of word address

  19. Some Signals (contd…) • Bus Arbitration • HOLD: HOLD request • HOLDA: HOLD acknowledge • DRAM control • SDRAS: SDRAM row address strobe • SDCAS: SDRAM column strobe • SDWE: SDRAM write enable • SDCLK: SDRAM clock

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