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Motorola DSP56301 user manual Synchronous/Asynchronous Operating Modes, Frame Sync Selection

Models: DSP56301

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Operating Modes: Normal, Network, and On-Demand

7.4.2Synchronous/Asynchronous Operating Modes

The transmit and receive sections of the ESSI interface are synchronous or asynchronous. The transmitter and receiver use common clock and synchronization signals in Synchronous mode; they use separate clock and sync signals in Asynchronous mode. The CRB[SYN] bit selects synchronous or asynchronous operation. When the SYN bit is cleared, the ESSI TX and RX clocks and frame sync sources are independent. If the SYN bit is set, the ESSI TX and RX clocks and frame sync are driven by the same source (either external or internal). Since the ESSI operates either synchronously or asynchronously, separate receive and transmit interrupts are provided.

Transmitter 1 and transmitter 2 operate only in Synchronous mode. Data clock and frame sync signals are generated internally by the DSP or obtained from external sources. If clocks are internally generated, the ESSI clock generator derives bit clock and frame sync signals from the DSP internal system clock. The ESSI clock generator consists of a selectable fixed prescaler with a programmable prescaler for bit rate clock generation and a programmable frame-rate divider with a word-length divider for frame-rate sync-signal generation.

7.4.3Frame Sync Selection

The transmitter and receiver can operate independently. The transmitter can have either a bit-long or word-long frame-sync signal format, and the receiver can have the same or another format. The selection is made by programming the CRB FSL[1–0], FSR, and FSP bits.

7.4.4Frame Sync Signal Format

CRB[FSL1] controls the frame sync signal format.

νIf CRB[FSL1] is cleared, the receive frame sync is asserted during the entire data transfer period. This frame sync length is compatible with Motorola codecs, serial peripherals that conform to the Motorola SPI, serial A/D and D/A converters, shift registers, and telecommunication pulse code modulation serial I/O.

νIf CRB[FSL1] is set, the receive frame sync pulses active for one bit clock immediately before the data transfer period. This frame sync length is compatible with Intel and National Semiconductor Corporation components, codecs, and telecommunication pulse code modulation serial I/O.

Enhanced Synchronous Serial Interface (ESSI)

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Motorola DSP56301 user manual Synchronous/Asynchronous Operating Modes, Frame Sync Selection, Frame Sync Signal Format
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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.