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Motorola DSP56301 user manual Serial Communication Interface SCI

Models: DSP56301

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Chapter 8

Serial Communication Interface (SCI)

The DSP56301 Serial Communication Interface (SCI) provides a full-duplex port for serial communication with other DSPs, microprocessors, or peripherals such as modems. The SCI interfaces without additional logic to peripherals that use TTL-level signals. With a small amount of additional logic, the SCI can connect to peripheral interfaces that have non-TTL level signals, such as RS-232, RS-422, and so on. This interface uses three dedicated signals: transmit data, receive data, and SCI serial clock. It supports industry-standard asynchronous bit rates and protocols, as well as high-speed synchronous data transmission. SCI asynchronous protocols include a multidrop mode for master/slave operation with wake-up on idle line and wake-up on address bit capability. This mode allows the DSP56301 to share a single serial line efficiently with other peripherals.

The SCI consists of separate transmit and receive sections that can operate asynchronously with respect to each other. A programmable baud rate generator supplies the transmit and receive clocks. An enable vector and an interrupt vector are included so that the baud-rate generator can function as a general-purpose timer when the SCI is not using it, or when the interrupt timing is the same as that used by the SCI.

8.1Operating Modes

The operating modes for the DSP56301 SCI are as follows:

ν

ν

ν

ν

8-bit synchronous (shift register mode)

10-bit asynchronous (1 start, 8 data, 1 stop)

11-bit asynchronous (1 start, 8 data, 1 even parity, 1 stop)

11-bit asynchronous (1 start, 8 data, 1 odd parity, 1 stop)

ν11-bit multidrop asynchronous (1 start, 8 data, 1 data type, 1 stop)

This mode is used for master/slave operation with wake-up on idle line and wakeup on address bit capability. It allows the DSP56301 to share a single serial line efficiently with other peripherals.

These modes are selected by the SCR WD[2–0] bits. Synchronous data mode is essentially a high-speed shift register for I/O expansion and stream-mode channel interfaces. A gated

Serial Communication Interface (SCI)

8-1

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Motorola DSP56301 user manual Serial Communication Interface SCI
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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.