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Features
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IEEE 802.11b Baseband and MAC for Supporting Standard Rates up to 11 Mbps 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 Wired Equivalency (WEP) in Hardware Supporting 64-bit and 128-bit Encryption The Integrated MAC Support Unit (MSU) Supports Timing Critical MAC Functions The WLAN and Inter-networking Functions Can be Changed and Updated Easily to New Requirements Since They are Implemented in Microcode Supports Automatic Fallback from 11 Mbps to 5.5, 2 and 1 Mbps 160-ball BGA Package Low-voltage 3.3V Operation Internal ROM Contains Hardwired CIS Information for Automatic Configuration when Card is Inserted in the PCMCIA Slot SPI Interface and 2 GPIO Pins AT76C504 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 Integrated 802.11b Baseband Processor Baseband Supports Antenna Diversity Algorithm Baseband Supports Differential or Single-ended I- and Q-Baseband Signals Baseband Supports Japan Filter
802.11b Media Access Controller (MAC) and Baseband for PCMCIA Bus AT76C504 Summary
Block Diagram
SPI Interface PCMCIA Interface Timers
Boot ROM
ARM7TDMI
External Memory Interface
Common Memory Interface Controller
Decoder/ Arbiter/ Bridge
MAC Support Unit (MSU)
Interrupt Controller
Internal Memory (SRAM)
802.11b Baseband
WEP
Rev. 2218AS-WLAN-08/02
Note: This is a summary document. A complete document is available under NDA. For more information, please contact your local Atmel sales office.
1
Description
The AT76C504 is a single-chip baseband controller that can handle IEEE 802.11b standard compliant data rates of up to 11 Mbps and provides all processing and functionality needed for the MAC protocol of IEEE 802.11b. AT76C504 provides a glueless interface conforming to PC Card 95 and can support a variety of RF interfaces. The AT76C504 chip incorporates an ARM7TDMI processor using a sophisticated architecture to control the on-chip peripherals, manage the internal memory and allocate data queue buffers as well as to communicate with the host through the PCMCIA parallel bus. The processor peripheral logic consists of a PCMCIA bus interface, a Serial Peripheral Interface (SPI), a MAC unit, a 802.11b Baseband block, the common memory interface, internal boot Read Only Memory (ROM) and the normal operation stages and common microcontroller blocks like timers, interrupt controller and bus arbiter. 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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AT76C504
2218AS-WLAN-08/02
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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 trademarks of Atmel. ARM7TDMI (R) and ARM (R), Thumb (R) are the registered trademarks of ARM, Ltd. Other terms and product names may be the trademarks of others.
Printed on recycled paper.
2218AS-WLAN-08/02 xM

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