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Features
* Wireless Interface Following the IEEE 802.11b Standard * Wireless LAN MAC Unit with ARM7TDMI(R) RISC Processor * Integrated 128-byte Transmit and 128-byte Receive FIFOs for Wireless MAC Layer
Functions
* 16-bit PCMCIA Bus Interface * Glueless SRAM Interface for All MAC Operations, Supporting up to 1M Byte of External
Memory
* Integrated 6K x 32-bit Internal SRAM, Used for Fast Program Code Execution and
Temporary Storage of Data
* Glueless Flash Memory Interface, Supporting up to 1M Byte of Nonvolatile Memory for * * * * * * * * *
Permanent Storage of Program Code Enciphering/Deciphering of Wireless Data On-the-fly by the Implementation of the Encryption/Decryption Code 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 Supports 11 Mbps Rates with Automatic Fallback to 5.5, 2 and 1 Mbps 144-lead TQFP Package Low-voltage 3.3V Operation Internal ROM Contains Hardwired CIS Information for Automatic Configuration when Card is Inserted in the PCMCIA Slot or Reads Custom CIS Information from SPI Memory Offers SPI interface and 3 GPIO Pins AT76C502A Offers the Option to Download the Whole Code from SPI DataFlash(R) or an Option to Eliminate Flash by Downloading the Program from the Mass Storage Device
11-megabit WLAN Media Access Controller (MAC) AT76C502A Summary
Block Diagram
PCMCIA Interface
Timers
Common Memory Interface Controller
External Memory Interface
ARM7TDMI
Decoder/ Arbiter/ Bridge
Interrupt Controller
Internal Memory
Wireless Physical Attachment Interface (PAI)
WEP
1948DS-WLAN-09/03
Note: This is a summary document. A complete document is available under NDA. For more information, please contact your local Atmel sales office.
Description
Fast VirtualNetTM (AT76C502A) is a single-chip controller that provides all processing and functionality needed for the MAC protocol of wireless LANs (focusing on, but not limited to the IEEE 802.11b standard). AT76C502A provides a glueless interface conforming to PC Card 95 and can control a variety of physical interfaces. The AT76C502A chip contains a PCMCIA bus interface, a MAC control unit and a physical attachment interface (PAI). The PAI supports direct-sequence spread spectrum and frequency-hopping spread spectrum (2 Mbps) physical interfaces, providing flexibility to end users. The ARM7TDMI core supports two alternative instruction sets. Powerful 32-bit code can be executed by the processor in ARM(R) operating mode. However, a 16-bit instruction subset is also available in Thumb(R) mode. Thumb mode can be selected to exploit full processor power with limited external memory resources. Note that ARM7TDMI operating mode can be changed at run time with negligible overhead.
Functional Diagram
PCMCI Controller
Common Memory Interface Controller
ASB Data Bus
RxFIFO TxFIFO
MUX
random WEP control
Wireless Physical Attachment Interface (WPAI) Control Path
ASB
22 Bits Wireless PHY Signals
ASB
Local Memory I/F ASB
WLAN ASB ASB
ASB
Internal Memory #1
Wireless LAN ARM Core (WLANARM)
Decoder/Arbiter/ Bridge
APB
Timers, Interrupt Controller
Memory Interface Controller
WLAN MAC Unit
2
AT76C502A
1948DS-WLAN-09/03
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Disclaimer: 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.
(c) Atmel Corporation 2003. All rights reserved. Atmel(R) and combinations thereof, and DataFlash (R) are the registered trademarks of Atmel Corporation or its subsidiaries. ARM7TDMI (R), ARM (R), ARM7 (R), and Thumb (R) are the registered trademarks of ARM, Ltd.; AMBA TM is the trademark of ARM, Ltd. Other terms and product names may be the trademarks of others.
Printed on recycled paper.
1948DS-WLAN-09/03

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