Wireless
Solutions
Libertas
™
Wireless LAN 802.11b Access Point Chipset
88W8000 and 88W8500
802.11b Access Point solution. The 88W8000 product performs all of the functions of an RF transceiver by
integrating a 20 dBm power ampliÞer, low noise ampliÞer, voltage-controlled oscillator, frequency synthesizer, as
well as other necessary RF and analog functions onto one CMOS chip. The 88W8500 device is a single chip that
combines the functions of the Direct Sequence Spread Spectrum (DSSS) baseband processor, Medium Access
Control (MAC) processor, on-chip CPU, on-chip memory, advanced encryption, external SDRAM/FLASH memory
controller, and one Fast Ethernet port (MAC and PHY). The high level of integration reduces the overall Bill of
Materials (BOM) cost for an access point by eliminating the need for an external CPU and Fast Ethernet port for
wired infrastructure connectivity. Together, the Libertas 88W8000 and 88W8500 chipset supports IEEE 802.11b
data rates of 1, 2, 5.5 and 11 Mbps, as well as a proprietary data rate of 22 Mbps. The 88W8000 and 88W8500
chipset provides an optimal solution for access points as well as wireless home gateway applications.
88W8500
2.4 GHz
PRODUCT OVERVIEW
The Marvell
¨
Libertas
ª
88W8000 and 88W8500 Wireless LAN (WLAN) chipset comprises the worldÕs most integrated
88W8000
On-Chip
LNA
RF
Filter
RF
Switch
VCO
On-Chip
PA
TR_SW
Serial I/F
Receiver
Frequency
Synthesizer
Transmitter
Power
Enable
Control
44 MHz
XOSC
Baseband Processor
Antenna
Diversity
ADC
DAC
Modulator
Demodulator
802.11
MAC
Protocol
Engine
Security
Engine
Internal Bus
SDRAM
Flash
Controller
802.3u MAC
802.3u PHY
ARM9
CPU
Memory
External
Flash or
SDRAM
MII, PCI, or
Twisted Pair
JTAG
UART
50 MHz
XOSC
GPIO/
LED
Power
Mgmt.
Serial
(EEPROM)
Controller
EEPROM
GPIO (15:0)
T/R Switch, Serial Interface, Power Enable Control
Fig 1. Libertas WLAN 802.11b Access Point Chipset (88W8000 and 88W8500) Block Diagram
88W8000 FEATURES
BENEFITS
¥
2.4 GHz ISM Band Radio
¥
Integration of all RF to analog baseband transmit and
receive functionalities
¥
On-chip power ampliÞer with 20 dBm output power at the
antenna connector
¥
On-chip power ampliÞer is programmable from 0 dBm to 20 dBm
¥
Integrated power loop control
¥
2x higher receiver sensitivity
¥
Programmable frequency synthesizers with integrated
VCOs and I/Q generation
¥
One single chip supports all RF to analog baseband functions of the
popular 802.11b standard
¥
Reduces BOM cost, simpliÞes board layout and provides smaller
form factor
¥
Reduces cost and increases range
¥
Allows transmit power control to be implemented for power savings
and extended battery life for host system
¥
Stabilizes power ampliÞer output at user designated values across
temperature, voltage supply and semiconductor variations
¥
Improves detection of weak signals and increases range
¥
Provide for longer range in terms of adaptive gain adjustments
for best signal reception
Libertas
™
Wireless LAN 802.11b Access Point Chipset
88W8500 FEATURES
BENEFITS
¥
Up to 4x better multi-path delay spread tolerance
¥
Packet-based antenna diversity
¥
Marvell custom DSP design
¥
On-chip MAC supports 802.11b standard data rates (1, 2, 5.5, and
11 Mbps) and the Marvell proprietary 22 Mbps high data rate mode
¥
On-chip, embedded ARM CPU core
¥
User selectable MII or PCI external interface
¥
Integrated 10/100 Mbps Fast Ethernet MAC and PHY with Virtual
Cable Testerª (VCT) technology
¥
Supports up to 256 MB external SDRAM and FLASH memory
¥
Hardware security implementation for WEP and IEEE 802.11i
AES encryption and decryption
¥
Supports 802.1x secure port protocol for advance security
authentication
APPLICATIONS
¥
Longer range and better link robustness (reduces drop-outs)
¥
Longer range and better transmit and receive performance
¥
Lower system power and provides better immunity to 2.4 GHz
jammers and interferers
¥
Fully compliant to 802.11b standard and also provides a ÒboostÓ
for high data rate applications
¥
Eliminates need for external CPU, lowers BOM cost and guards
against any potential IEEE standards modiÞcations
¥
For external connection to multi-port switches and external
system bus
¥
Reduces BOM cost and provides a method to diagnose cabling
and connection faults
¥
Provides increased support of additional wireless clients
¥
Allows the most secure wireless connections
¥
Adds further authentication mechanism for improved security
in corporate environments
The Marvell Libertas 88W8000 and 88W8500 chipset supports 802.11b access point and wireless gateway applications. Access
point applications are greatly simpliÞed with the on-chip CPU and integrated 10/100 Fast Ethernet PHY and MAC. In addition,
the MII interface from the 88W8500 device can be used to support an external Marvell 5-port switch for a wireless and wired
gateway application.
Marvell Libertas 802.11b AP Solution
Marvell Libertas 802.11b Wireless Home Gateway Solution
SDRAM FLASH
Libertas
RF-Baseband
Transceiver
(88W8000)
Libertas
BBP/MAC/
Access Point
(88W8500)
Ethernet
(CAT 5)
SDRAM FLASH
Wired
Infrastructure
Libertas
RF-Baseband
Transceiver
(88W8000)
MII
Marvell 5-port
Libertas
BBP/MAC/
Switch
Access Point
(e.g.88E6052)
(88W8500)
WAN or
Broadband
Modem
Fig 2. Libertas WLAN 802.11b Access Point Chipset
(88W8000 and 88W8500) Applications Diagram
THE MARVELL ADVANTAGE:
Fig 3. Libertas WLAN 802.11b Access Point Chipset
(88W8000 and 88W8500) Home Gateway Applications Diagram
4 Ethernet
LAN ports
The Libertas 802.11b WLAN access point chipset also comes with complete reference designs which include
such items as board layout designs, Þrmware, software, documentation, and other items to assist customers with product evaluation and
production. MarvellÕs worldwide Þeld applications engineers collaborate closely with end customers to develop and deliver new competitive
products to market on time. Marvell utilizes recognized world-leading semiconductor foundry and packaging services to reliably deliver
high-volume and low cost total solutions.
For more information, visit our website at www.marvell.com.
Marvell Semiconductor, Inc.
700 First Avenue
Sunnyvale, CA 94089
Phone 408.222.2500
www.marvell.com
©2002 Marvell International Ltd. All rights reserved. Marvell, the Marvell logo, Moving
Forward Faster, Alaska, the Galileo logo, and GalNet are registered trademarks of Marvell.
Discovery, Fastwriter, Galileo Technology, GalTis, Horizon, Libertas, Prestera, and Virtual
Cable Tester are trademarks of Marvell. All other trademarks are the property of their
respective owners.
100402-001 08/02
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