Embest SBC8018, Руководство пользователя

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Copyright © 2011 by element14 User Manual
Chapter 2 Hardware System
2.1 CPU
2.1.1 CPU Introduction
The AM1808 microprocessor contains an ARM RISC CPU for general-purpose processing and
systems control. The AM1808 ARM microprocessor consists of the following primary components:

ARM926EJ-S RISC processor core and associated memories

A set of I/O peripherals

A powerful DMA subsystem and SDRAM EMIF interface
2.1.2 CPU Features
Clock
The OSCIN/ OSCOUT system input clock (24 MHz) is used to generate the main source clock for
the device. It also provides the DPLLs to several CPU other modules.
Reset
The function of reset is determined by the input signal on RESETN pin of the CPU, Reset is
enabled when LOW level signal (high to low) is given.
ARM Subsystem
The ARM Subsystem includes the following features:

ARM926EJ-S RISC processor

ARMv5TEJ (32/16-bit) instruction set

Little endian

System Control Co-Processor 15 (CP15)

MMU

16KB Instruction cache

16KB Data cache

Write Buffer

Embedded Trace Module and Embedded Trace Buffer (ETM/ETB)

ARM Interrupt controller