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Features
* IEEE 802.11b-compliant Wireless Standard * Wireless LAN MAC Unit with ARM7TDMITM RISC Processor * Integrated 128-byte Transmit and 128-byte Receive FIFOs, for Wireless MAC Layer
Functions
* Delivers Standard Wireless Networking to Any Host that Supports a Full-speed
(12 Mbps) USB 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 Bytes of Nonvolatile Memory
for Permanent Storage of Program Code
* Wired Equivalent Privacy (WEP) in Hardware Supporting 64-bit and 128-bit Encryption * The Integrated Physical Attachment Interface (PAI) Fully Supports Direct-sequence
Spread Spectrum and Frequency-hopping Spread Spectrum Physical-layer Interfaces
* The WLAN and Inter-networking Functions can be Changed and Updated Easily to New
Requirements Since They are Implemented in Micro Code Supports 11 Mbps Data Rate with Automatic Fallback to 5.5, 2 and 1 Mbps 128-lead, 14 x 14 mm TQFP Package Low-voltage Operation (3.3V) Internal ROM Contains Hardwired USB Control Software for Automatic Configuration when Card is Inserted in the USB Slot * Device Firmware Upgrade is also Included in the Internal ROM for Downloading Firmware into Internal SRAM * Offers SPI Interface and Five GPIO Pins * AT76C503A Offers the Option to Download the Whole Code from SPI Flash
* * * *
Universal Serial Bus 11-megabit WLAN Media Access Controller AT76C503A Summary
Block Diagram
WEP
USB Interface
Wireless Physical Attachment Interface
External Memory Interface
Internal/External Memory Interface Controller
ARM7TDMI
Decoder/ Arbiter/ Bridge
Internal Memory
Timers
Interrupt Controller
Rev. 1949CS-WLAN-06/02
Note: This is a summary document. A complete document is available under NDA. For more information, please contact your local Atmel sales office.
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Description
AT76C503A 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). AT76C503A provides a glueless interface conforming to 12-Mbit Universal Serial Bus (USB) specification and can control a variety of wireless physical interfaces. The AT76C503A chip contains a USB interface, a MAC control unit, and a PAI. The PAI supports 5.5- and 11-Mbit WLAN physical interfaces and the IEEE 802.11 (1 or 2 Mbps) direct-sequence spread spectrum and frequency-hopping spread spectrum 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.
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AT76C503A
1949CS-WLAN-06/02
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(c) Atmel Corporation 2002. 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) and DataFlash (R) are the registered trademark of Atmel. ARM7TDMI (R), ARM (R), and Thumb (R) are the registered trademarks of ARM, Ltd. AMBA TM is the trademark of ARM, Ltd. Microsoft(R), Windows (R) 98/CE and Windows NT (R) are the registered trademarks of Microsoft Corporation; SunSolaris TM is trademark of Sun Corporation. Other terms and product names may be the trademarks of others.
Printed on recycled paper.
1949CS-WLAN-06/02 xM

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