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Wireless Solutions
LibertasTM
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 amplier, low noise amplier, 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 88W8000 and 88W8500 Wireless LAN (WLAN) chipset comprises the worldOs 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 amplier with 20 dBm output power at the antenna connector On-chip power amplier 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, simplies 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 amplier 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
LibertasTM 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 Tester (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 OboostO for high data rate applications Eliminates need for external CPU, lowers BOM cost and guards against any potential IEEE standards modications 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 simplied 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, rmware, software, documentation, and other items to assist customers with product evaluation and production. MarvellOs worldwide eld 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
(c)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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