RTL8181 Просмотр технического описания (PDF) - Realtek Semiconductor

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RTL8181

Wireless LAN Access Point/Gateway Controller

Realtek Semiconductor 

RTL8181

1. Overview

RTL8181 is a highly integrated SoC, embedded with a high-performance 32-bit RISC microcontroller, Ethernet and WLAN

controller. It is a cost-effective and high- performance solution for the system of wireless LAN Access Point, wireless SOHO

router, wireless Internet gateway, etc.

System block diagram:

EJTAG

Microprocessor 802.11b MAC/BB

RF transceiver

Timer

Watchdog

UART

Cache buffer

MMU

Ethernet MAC0

MII

Ethernet PHY

LAN

Ethernet MAC1

MII

Ethernet PHY

WAN

GPIO

Memory controller

PCI Bridge

PCI device

Flash

SDRAM

PCI device

The embedded processor of RTL8181 is Lexra LX5280 32bit RISC CPU, with 8K separate instruction and data caches. A

protection unit (MMU) allows the memory be segmented and protected, and this unit is required in the modern operation

system (e.g., Linux).

The processor pipeline is a dual- issues and 6 stage architecture. The dual- issue CPU fetches two instructions per cycle, and

which could allow two instructions are executed concurrently in two pipes via some instructions. Thus, its performance will

achieve up to 30% improvement over uni-scalar architecture.

Besides, it includes two fast Ethernet MACs, one could be used for LAN interface and the other one could connect to WAN

port. An IEEE 802.11b WLAN MAC+Baseband processor is embedded as well. By this build- in wireless controller, it could

save a lot of costs and space comparing with the system designed with an external 802.11b adapter.

The RTL8181 also integrates with memory controller, which allows customers use external SDRAM and Flash memory in

glueless.

A PCI interface is supported as well, which enables customers to plug in a PCI device seamlessly. For example, an IEEE

802.11a device could be connected through this PCI interface to provide the WLAN dual mode service.

Features

Core Processor

? LX5280 32-bit RISC architecture.

? Superscalar architecture, containing 2 execution pipelines with better performance

? Embedded with 8K I-Cache, 8K D-Cache and 4K D-RAM.

? MMU supported

? Up to 200MHZ operating frequency

WLAN Controller

? Integrated IEEE 802.11b complied MAC and DSSS Baseband processor

? Support Tx data rate in 11M, 5.5M, 2M and 1M

? Support long and short preamble

? Support antenna diversity and AGC.

? Embedded with encryption/decryption engine for 64 bits and 1 28 bits WEP

CONFIDENTIAL

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v1.0

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