Lab 1

Textbook Notes (Chapter 1)

A digital signal processor is a specialized form of a microprocessor. The architecture and ISA of a DSP are optimized for real-time digital signal processing.

Typical features include:

• Hardware multiply-accumulate provision

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• Hardware circular and bit-reversed addressing capabilities
• Harvard architecture

The architecture of the C6x DSP (the one we use in lab) is very well suited to numerically intensive calculations due to ‘very-long-instruction-word’ architecture.

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<aside> 💡 Example 1 (sine8_LED.c)

One cycle of the sinusoidal analog output waveform corresponds to eight output samples and hence the frequency of the sinusoidal analog output waveform is equal to the codec sampling rate (8 kHz) divided by eight, that is, 1 kHz.

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<aside> 💡 What’s the difference between Polling and Interrupt based coding?

• Polling involves the CPU actively checking the status of devices or inputs at regular intervals, making it suitable for simpler systems with few devices or when CPU efficiency is not critical.
• Interrupt-based coding relies on hardware interrupts to notify the CPU of events or inputs, resulting in more efficient CPU utilization, lower latency, and better scalability, making it the preferred choice for most complex and real-time systems. </aside>

PROM is programmable once outside of the factory