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Motorola DSP56301 user manual Internal I/O Space-X Data Memory, Internal Y Data Memory

Models: DSP56301

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Y Data Memory Space

3.2.3Internal I/O Space—X Data Memory

One part of the on-chip peripheral registers and some of the DSP56301 core registers occupy the top 128 locations of the X data memory ($FFFF80–$FFFFFF). This area is referred to as the internal X I/O space and it can be accessed by MOVE, MOVEP instructions and by bit-oriented instructions (BCHG, BCLR, BSET, BTST, BRCLR, BRSET, BSCLR, BSSET, JCLR, JSET, JSCLR and JSSET). The contents of the internal X I/O memory space are listed in Section B.1 in Appendix B.

3.3Y Data Memory Space

The Y data memory space consists of the following:

ν

ν

Internal Y data memory (2 K by default up to 3 K)

External I/O space (upper 128 locations)

νOptional off-chip memory expansion (up to 64 K in 16-bit mode or 16 M in 24-bit mode). Refer to the DSP56300 Family Manual, especially Chapter 9, External Memory Interface (Port A), for details on using the external memory interface to access external Y data memory.

Note: The Y memory space at $FF0000–$FFEFFF is reserved and should not be accessed.

3.3.1Internal Y Data Memory

The default on-chip Y data RAM is a 24-bit-wide, internal, static memory occupying the lowest 2 K ($000–$7FF) of Y memory space. The on-chip Y data RAM is organized into 8 banks with 256 locations each. Available Y data memory space is increased by 1 K through reallocation of program memory using the memory switch mode described in the next section.

3.3.2Memory Switch Modes—Y Data Memory

Memory switch mode reallocates of portions of program RAM to X and Y data memory. Bit 7 in the OMR is the MS bit that controls this function, as follows:

νWhen the MS bit is cleared, the Y data memory consists of the default 2 K × 24-bit memory space described in the previous section. In this default mode, the lowest external Y data memory location is $800.

νWhen the MS bit is set, a portion of the higher locations of the internal program

memory is switched to X and Y data memory. The Y data memory in this mode consists of a 3 K × 24-bit memory space. In this mode, the lowest external Y data

memory location is $C00.

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DSP56301 User’s Manual

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Motorola DSP56301 user manual Internal I/O Space-X Data Memory, Internal Y Data Memory, Memory Switch Modes-Y Data Memory
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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.