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Features
* Wireless Interface Following the IEEE 802.11b Standard * Ethernet MAC Unit (EMU) Interfaces with 10/100-Mbit Ethernet Physical through a
Standard MII Port
* Inter-networking Unit (INWARM) with Integrated ARM7TDMI(R) RISC Processor Provides
the Bridging Functions between Ethernet and Wireless Interfaces
* WLAN MAC Unit with a Second ARM7TDMI RISC Processor and Integrated 128-byte
Transmit and 128-byte Receive FIFOs, for Wireless MAC Layer Functions
* Glueless SRAM Interface for all MAC Operations, Supporting up to 16M Bytes of
Common External Memory Shared between Both Processors
* Integrated 2 x 6K x 32-bit Internal SRAM Memory Banks, Used for Each Processor's * * * * * *
Program Code and Data Space Glueless Flash Memory Interface, Supporting up to 16M Bytes of Nonvolatile Memory for Permanent Storage of Program Code Enciphering/Deciphering of Wireless Data On-the-fly Ensures Maximum Privacy of Data The Integrated Physical Attachment Interface (PAI), Fully Supports Direct Sequence Spread Spectrum and Frequency Hopping Spread Spectrum (2 Mbps) Physical-layer Interfaces The WLAN and Inter-networking Functions Can Be Changed and Updated Easily to New Requirements Since They are Implemented in Microcode 3.3V for Core and I/O 128-lead Plastic Quad Flat Pack (PQFP) or Thin Quad Flat Pack (TQFP) Package
Ethernet to Wireless Bridge-on-aChip AT76C510 VNET-B Summary
Block Diagram
Inter-networking ARM Core (IWARM) Internal Memory #2 External Memory Interface Internal Memory #1 WLAN ARM Core (WLANARM) Decoder/Arbiter/ Bridge #2 Timers, Interrupt Controller #2
Common Memory Interface Controller
Ethernet Processor
Wireless Physical Attachment Interface (WPAI)
Decoder/Arbiter/ Bridge #1
Timers, Interrupt Controller #1
Rev. 1650DS-WLAN-01/03
Note: This is a summary datasheet. A complete document is available under NDA. For more information, please contact your local Atmel Sales office.
1
Overview
Wireless to Ethernet Bridge (VNET-B) is the Inter-networking device for interconnecting a Wireless LAN with other Wireless LANs (WLAN) and legacy LANs. VNET-B based bridges act as Access Points (AP) to the WLAN and communicate packets that are destined outside the WLAN using IP over Ethernet. In case the WLAN user is mobile, roaming functions are also supported at the VNET-B bridges. The data transactions over this unified environment are categorized according to the type of end-to-end devices.
End Stations Transactions Inter-networking Device Transactions
When two end stations communicate (irrespective to the type of network they belong) the inter-networking between the different networks should be transparent. The VNET-B device implements all necessary communication protocols for supporting inter-networking functions, implements logical grouping of users independent of their physical location and provides secure links by implementing encryption algorithms.
2
AT76C510
1650DS-WLAN-01/03
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(c) Atmel Corporation 2003. Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company's standard warranty which is detailed in Atmel's Terms and Conditions located on the Company's web site. The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein. No licenses to patents or other intellectual property of Atmel are granted by the Company in connection with the sale of Atmel products, expressly or by implication. Atmel's products are not authorized for use as critical components in life support devices or systems. ATMEL (R) is the registered trademarks of Atmel. ARM7TDMI (R) is the registered trademark ARM, Ltd. Other terms and product names may be the trademarks of others. Printed on recycled paper.
1650DS-WLAN-01/03 xM

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