AT76C504A

Features • Integrates the IEEE 802.11b Physical Layer (Baseband) and the Media Access Controller (MAC) for Supporting Standard Rates up to 11 Mbps • Supports Antenna Diversity Algorithm, Automatic Receive Gain Control, Transmit Gain • • • • • • • • • • • • • • • Control, Transmit Filter for Japanese Regulatory and Differential or Single-ended I- and Q-Baseband Signals Integrates 160 KBytes of SRAM which Are Organized in Five Banks of 32 KBytes Each, Offering the Flexibility for individually Configuring Each of them as Program or Data Memory Zero Wait States for Program Execution Fast Data Transfers through DMA Channels Low Power ARM7TDMI® RISC Processor The Bootstrap Code Supports External SPI EEPROM for the Custom Configuration Parameters Used during the Device Enumeration Phase as Well as Default Parameters for First Time EEPROM Programming Glueless Parallel Flash Memory Interface, Supporting up to 128 KBytes of Nonvolatile Memory Glueless External SRAM Interface for all MAC Operations, Supporting up to 128 KBytes of External Memory Wired Equivalency Privacy (WEP) in Hardware Supporting 64-bit and 128-bit Keys Hardware Implementation of TKIP Hardware Implementation of AES Encryption Supporting Various Modes (CCM/CTR/CBC) The WLAN Functions Can Be Easily Changed or Updated to New Requirements Since They are Implemented in Microcode Supports 11 Mbps Rates with Automatic Fallback to 5.5, 2 and 1 Mbps SPI Interface and 13 GPIO Pins 176-ball LFBGA Package Low-voltage 1.8V Core Operation 802.11b Baseband and Media Access Controller (MAC) for PCMCIA Bus AT76C504A Summary Block Diagram PCMCIA Interface SPI Interface Timers Boot ROM ARM7TDMI External Memory Interface Decoder/ Arbiter/ Bridge Common Memory Interface Controller MAC Support Unit (MSU) Interrupt Controller Internal Memory (SRAM) 802.11b Baseband Encryption/ Decryption Block Rev. 2388CS–WLAN–07/03 Note: This is summary datasheet. A complete document is available under NDA. For more information please contact your local Atmel sales office. 1 Description The AT76C504A 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. AT76C504A provides a glueless interface conforming to PC Card 95 and can support a variety of RF interfaces. The AT76C504A 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 controller, a WEP/TKIP engine block, an AES engine block, two memory controllers and the ARM® subsystem consisting of an Interrupt Controller, two 32-bit timers and an address decoder unit. The ARM7TDMI core supports two alternative instruction sets. Powerful 32-bit code can be executed by the processor in ARM operating mode. However, a 16-bit instruction subset is also available in Thumb® 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. 2 AT76C504A 2388CS–WLAN–07/03 Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131 Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131 Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany Tel: (49) 71-31-67-0 Fax: (49) 71-31-67-2340 1150 East Cheyenne Mtn. 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Blvd. Colorado Springs, CO 80906 Tel: 1(719) 576-3300 Fax: 1(719) 540-1759 Scottish Enterprise Technology Park Maxwell Building East Kilbride G75 0QR, Scotland Tel: (44) 1355-803-000 Fax: (44) 1355-242-743 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 e-mail literature@atmel.com Web Site http://www.atmel.com Disclaimer: A tmel 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 Corporation 2003 . A ll rights reserved. A tmel ® a nd combinations thereof, and DataFlash ® a re the registered trademarks of Atmel Corporation or its subsidiaries. ARM7TDMI ®, ARM ®, and Thumb ® a re the registered trademarks of ARM, Ltd. Other terms and product names may be the trademarks of others. Printed on recycled paper. 2388CS–WLAN–07/03 xM