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1 Features •IEEE 802.11b-compliant Wireless Standard •Wireless LAN MAC Unit with ARM7TDMI ™ 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 Block Diagram USB Interface Wireless Physical Attachment Interface External Memory Interface Internal Memory Internal/External Memory Interface Controller ARM7TDMI Decoder/ Arbiter/ Bridge Timers Interrupt Controller WEP Universal Serial Bus 11-megabit WLAN Media Access Controller AT76C503A Summary 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.