Internal Buses, On-Chip Memory | Motorola DSP56301 instruction

Internal Buses

1.4.6On-Chip Memory

The memory space of the DSP56300 core is partitioned into program, X data, and Y data memory space. The data memory space is divided into X and Y data memory in order to work with the two address ALUs and to feed two operands simultaneously to the data ALU. Memory space includes internal RAM and ROM and can be expanded off-chip under software control. There is an on-chip 192/3K x 24-bit bootstrap ROM. For details on internal memory, see Chapter 3, Memory Configuration. Program RAM, instruction cache, X data RAM, and Y data RAM size are programmable, as Table 1-2shows.

Table 1-2.DSP56301 Switch Memory Configuration

Program		Instruction	X Data RAM	Y Data RAM	Instruction Cache1	Switch Mode2
RAM Size		Cache Size	Size	Size	Instruction Cache1	Switch Mode2
RAM Size		Cache Size	Size	Size


4096 × 24-bit		0	2048 × 24-bit	2048 × 24-bit	disabled (CE = 0)	disabled (MS = 0)

3072 × 24-bit		1024 × 24-bit	2048 × 24-bit	2048 × 24-bit	enabled (CE = 1)	disabled (MS = 0)

2048 × 24-bit		0	3072 × 24-bit	3072 × 24-bit	disabled (CE = 0)	enabled (MS = 1)

1024 × 24-bit		1024 × 24-bit	3072 × 24-bit	3072 × 24-bit	enabled (CE = 1)	enabled (MS = 1)

1. Controlled by the Cache Enable (CE) bit in the Status Register (SR)
2.	Controlled by the Memory Select (MS) bit in the Operating Mode Register (OMR)

1.5Internal Buses

All internal buses on the DSP56300 devices are 24-bit buses. To provide data exchange between the blocks, the DSP56301 implements the following buses:

νPeripheral I/O expansion bus to peripherals

νX memory expansion bus to X memory

νY memory expansion bus to Y memory

νProgram data bus for carrying program data throughout the core

νX memory data bus for carrying X data throughout the core

νY memory data bus for carrying Y data throughout the core

νProgram address bus for carrying program memory addresses throughout the core

νX memory address bus for carrying X memory addresses throughout the core

νY memory address bus for carrying Y memory addresses throughout the core.

1-10	DSP56301 User’s Manual

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.

Motorola user manual Internal Buses, On-Chip Memory, DSP56301 Switch Memory Configuration

Models: DSP56301

1.4.6On-Chip Memory

Table 1-2.DSP56301 Switch Memory Configuration

1.5Internal Buses

DSP56301 specifications