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Motorola DSP56301 user manual Frame Sync Length for Multiple Devices, Frame Sync Polarity

Models: DSP56301

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Operating Modes: Normal, Network, and On-Demand

7.4.5Frame Sync Length for Multiple Devices

The ability to mix frame sync lengths is useful to configure systems in which data is received from one type of device (for example, codec) and transmitted to a different type of device. CRB[FSL0] controls whether RX and TX have the same frame sync length.

ν

ν

If CRB[FSL0] is cleared, both RX and TX have the same frame sync length.

If CRB[FSL0] is set, RX and TX have different frame sync lengths.

CRB[FSL0] is ignored when CRB[SYN] is set.

7.4.6Word Length Frame Sync and Data Word Timing

The CRB[FSR] bit controls the relative timing of the word length frame sync relative to the data word timing.

νWhen CRB[FSR] is cleared, the word length frame sync is generated (or expected) with the first bit of the data word.

νWhen CRB[FSR] is set, the word length frame sync is generated (or expected) with the last bit of the previous word.

CRB[FSR] is ignored when a bit length frame sync is selected.

7.4.7Frame Sync Polarity

The CRB[FSP] bit controls the polarity of the frame sync.

νWhen CRB[FSP] is cleared, the polarity of the frame sync is positive; that is, the frame sync signal is asserted high. The ESSI synchronizes on the leading edge of the frame sync signal.

νWhen CRB[FSP] is set, the polarity of the frame sync is negative; that is, the frame sync is asserted low. The ESSI synchronizes on the trailing edge of the frame sync signal.

The ESSI receiver looks for a receive frame sync edge (leading edge if CRB[FSP] is cleared, trailing edge if FSP is set) only when the previous frame is completed. If the frame sync is asserted before the frame is completed (or before the last bit of the frame is received in the case of a bit frame sync or a word-length frame sync with CRB[FSR] set), the current frame sync is not recognized, and the receiver is internally disabled until the next frame sync.

Frames do not have to be adjacent; that is, a new frame sync does not have to follow the previous frame immediately. Gaps of arbitrary periods can occur between frames. All the enabled transmitters are tri-stated during these gaps.

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DSP56301 User’s Manual

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Motorola DSP56301 Frame Sync Length for Multiple Devices, Word Length Frame Sync and Data Word Timing, Frame Sync Polarity
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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.