Section DMA Controller Module | Motorola MC68340 instruction

Freescale Semiconductor, Inc.

Semiconductor, Inc.

SECTION 6 DMA CONTROLLER MODULE

The direct memory access (DMA) controller module provides for high-speed transfer capability to/from an external peripheral or for memory-to-memory data transfer. The DMA module, shown in Figure 6-1, provides two channels that allow byte, word, or long-word operand transfers. These transfers can be either single or dual address and to either on- or off-chip devices. The DMA contains the following features:

•Two, Independent, Fully Programmable DMA Channels

•Single-Address Transfers with 32-Bit Address and 32-Bit Data Capability

•Dual-Address Transfers with 32-Bit Address and 16-Bit Data Capability

•Two 32-Bit Transfer Counters

•Four 32-Bit Address Pointers That Can Increment or Remain Constant

•Operand Packing and Unpacking for Dual-Address Transfers

•Supports All Bus-Termination Modes

•Provides Two-Clock-Cycle Internal Module Access

•Provides Two-Clock-Cycle External Access Using MC68340 Chip Selects

•Provides Full DMA Handshake for Burst Transfers and Cycle Steal

Freescale

M B

INTERRUPT ARBITRATION

SLAVE BIU

MASTER BIU

BUS

ARBITRATION

DMA CHANNEL 1

DMA CHANNEL 2

DMA HANDSHAKE SIGNALS

DMA HANDSHAKE SIGNALS.

Figure 6-1. DMA Block Diagram

MOTOROLAMC68340 USER’S MANUAL6- 1

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MC68340 specifications

The Motorola MC68340 is a highly integrated microprocessor that was introduced in the early 1990s. It belongs to the 68000 family of microprocessors and is designed to cater to the demands of embedded systems, particularly in telecommunications and networking applications. This chip represents a significant evolution in microprocessor technology by combining a microprocessor core with additional peripherals on a single chip, making it an attractive solution for engineers looking to design compact and efficient systems.

One of the key features of the MC68340 is its 32-bit architecture, which allows for significant processing power and data handling capabilities. This architecture enables the processor to handle larger data sizes and perform more complex calculations compared to its 16-bit predecessors. The MC68340 operates at clock speeds typically ranging from 16 MHz to 25 MHz. Its dual instruction pipeline enhances throughput, allowing for simultaneous instruction fetches and executions, which significantly boosts performance.

A notable characteristic of the MC68340 is the inclusion of integrated peripherals, which help reduce the overall component count in a system. Key integrated components include a memory management unit (MMU), a direct memory access (DMA) controller, and various communication interfaces such as serial ports. The memory management capabilities enhance the processor's ability to manage memory resources efficiently, enabling it to support multitasking environments commonly found in modern computing.

In terms of connectivity, the MC68340 features connections for both synchronous and asynchronous serial communication, making it well-suited for networking tasks. The processor supports a range of bus standards, including address and data buses, which facilitate seamless interaction with peripheral devices.

Another important aspect of the MC68340 is its flexibility. The processor supports multiple operating modes, including multiple CPU configurations and compatibility with the Motorola 68000 family, allowing for easier integration into existing systems.

Moreover, the MC68340 boasts low power consumption compared to many of its contemporaries, making it an excellent choice for battery-operated applications, enhancing its appeal in sectors like telecommunications, industrial control, and automotive systems. Its combination of performance, integration, versatility, and efficiency has secured the MC68340 a reputable position in the annals of embedded systems technology, proving to be a valuable asset for developers and engineers alike.

Motorola MC68340 manual Section DMA Controller Module

Models: MC68340

Freescale Semiconductor, Inc.

SECTION 6

DMA CONTROLLER MODULE

Freescale

Figure 6-1. DMA Block Diagram

MC68340 specifications