General-Purpose Input/Output (GPIO)

5.3.3DMA

The Direct Memory Access (DMA) controller permits data transfers between internal/ external memory and/or internal/external I/O in any combination without the intervention of the core. Dedicated DMA address and data buses and internal memory partitioning ensure achievement of high-level isolation so the DMA operation does not interfere with or slow down core operation. The DMA moves data to/from the peripheral transmit/receive registers. You can use the DMA control registers to configure sources and destinations of data transfers. Depending on the peripheral, one to four peripheral request sources are available. This is the most efficient method of data transfer available. Core intervention is not required after the DMA channel is initialized. DMA requires more initialization code and consideration of DMA modes. However, it is the most efficient use of core resources. Once these registers are programmed, you must enable the DMA by triggering a DMA request off one of the peripheral control flags or enabling it in normal program flow or an interrupt service routine.

5.3.4Advantages and Disadvantages

Polling is the easiest method to implement, but it requires a large amount of DSP56300 core processing power. The core cannot be involved in other processing activities while it is polling receive and transmit ready bits. Interrupts require more code, but the core can process other routines while waiting for data I/O. An interrupt is generated when data is ready to be transferred to or from the peripheral device. DMA requires even less core intervention, and the setup code is minimal, but the DMA channels must be available.

5.4General-Purpose Input/Output (GPIO)

The DSP56301 provides 42 bidirectional pins that can be configured as GPIO signals or as peripheral-dedicated signals or some combination of both depending on the peripheral. No dedicated GPIO pins are provided. All peripheral pins, except those of the HI32, are GPIO inputs by default after reset. The control register settings of the DSP56301 peripherals determine whether these pins function as GPIO or as peripheral-dedicated signals or some combination of both. This section tells how signals are used as GPIO. Chapter 2, Signals/Connections details the special uses of the 42 bidirectional pins. These signals fall into five groups and are controlled separately or as a group:

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ν

ν

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Port B—24 GPIO signals (shared with part of the host interface signals)

Port C—6 GPIO signals (shared with the ESSI0 signals)

Port D—6 GPIO signals (shared with the ESSI1 signals)

Port E—3 GPIO signals (shared with the SCI signals)

Timers—3 GPIO signals (shared with the triple timer signals)

5-4

DSP56301 User’s Manual

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Motorola DSP56301 user manual General-Purpose Input/Output Gpio, 3 DMA, Advantages and Disadvantages
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DSP56301 specifications

The Motorola DSP56301 is a highly efficient digital signal processor, specifically engineered for real-time audio and speech processing applications. This DSP is part of Motorola's renowned DSP56300 family, which is recognized for its innovative features and outstanding performance in the realm of digital signal processing.

One of the main features of the DSP56301 is its ability to handle complex computations at high speeds. With a maximum clock frequency of 66 MHz, it delivers fast performance, enabling it to process audio signals in real time. The chip is built on a 24-bit architecture, which allows for high-resolution audio processing. This is particularly beneficial in applications such as telecommunications, consumer audio devices, and professional audio equipment, where precision is paramount.

The DSP56301 boasts a comprehensive instruction set that includes efficient mathematical operations, which are essential for digital filters and audio effects processing. One of the key innovations of this device is its dual data path architecture, which permits simultaneous processing of multiple data streams. This feature significantly enhances the device's throughput and responsiveness, making it suitable for demanding applications such as voice recognition and synthesis.

In terms of memory regions, the DSP56301 includes several on-chip memory categories, such as program memory, data memory, and a specialized memory for coefficients. The architecture's support for external memory expansion further increases its versatility, allowing designers to tailor systems to their specific requirements.

The DSP56301 implements advanced features such as a powerful on-chip hardware multiplier and accumulator, simplifying complex mathematical tasks and accelerating the execution of algorithms. Its flexible interrupt system enhances its capability to respond to time-sensitive operations, while the integrated serial ports facilitate efficient data communication with external devices.

Power consumption is also a vital characteristic of the DSP56301. It is designed with energy efficiency in mind, allowing for extended operation in battery-powered devices. The chip’s low power requirements are particularly advantageous in portable audio devices and other applications where energy conservation is crucial.

In conclusion, the Motorola DSP56301 is an exceptional digital signal processor that combines high processing power, flexibility, and efficiency. Its main features, advanced technologies, and robust architecture make it a top choice for developers seeking to create sophisticated audio and signal processing systems. With its enduring legacy in the industry, the DSP56301 continues to be relevant in a variety of modern applications, ensuring it remains a valuable tool for engineers and designers.
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