To Next Page

To Previous Page

Introduction

1.1 About the ARM926EJ-S processor

The ARM926EJ-S processor is a member of the ARM9 family of general-purpose

microprocessors. The ARM926EJ-S processor is targeted at multi-tasking applications

where full memory management, high performance, low die size, and low power are all

important.

The ARM926EJ-S processor supports the 32-bit ARM and 16-bit Thumb instruction

sets, enabling the user to trade off between high performance and high code density. The

ARM926EJ-S processor includes features for efficient execution of Java byte codes,

providing Java performance similar to JIT, but without the associated code overhead.

The ARM926EJ-S processor supports the ARM debug architecture and includes logic

to assist in both hardware and software debug. The ARM926EJ-S processor has a

Harvard cached architecture and provides a complete high-performance processor

subsystem, including:

• an ARM9EJ-S integer core

• a Memory Management Unit (MMU)

• separate instruction and data AMBA AHB bus interfaces

• separate instruction and data TCM interfaces.

The ARM926EJ-S processor provides support for external coprocessors enabling

floating-point or other application-specific hardware acceleration to be added. The

ARM926EJ-S processor implements ARM architecture version 5TEJ.

The ARM926EJ-S processor is a synthesizable macrocell. This means that you can

optimize the macrocell for a particular target library, and that you can configure the

memory system to suit your target application. You can individually configure the cache

sizes to be any power of two between 4KB and 128KB.

The tightly-coupled instruction and data memories are instantiated externally to the

ARM926EJ-S macrocell, providing you with the flexibility of optimizing the memory

subsystem for performance, power, and particular RAM type. The TCM interfaces

enable nonzero wait state memory to be attached, as well as providing a mechanism for

supporting DMA.

Figure 1-1 on page 1-3 shows the main blocks in the ARM926EJ-S processor.

ARM ARM926EJ-S User Manual

Questions and Answers: