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Features
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IEEE 802.11b MAC and Baseband 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 PCI Bus Interface Compliant with PCI v2.2 and PCI Power Management Specification v1.1 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 Privacy (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 11 Mbps Rates with Automatic Fallback to 5.5, 2 and 1 Mbps 160-pin BGA Package Low-voltage 3.3V Operation SPI Interface and 2 GPIO Pins AT76C506 Offers the Option to Download the Whole Code from SPI DataFlash(R) or an Option to Eliminate Flash by the Program From the Mass Storage Device Integrated 802.11 Baseband Processor Baseband Supports Antenna Diversity Algorithm Baseband Supports Japan Filter Baseband Supports Differential or Single-ended I- and Q-Baseband Signals
802.11b Media Access Controller (MAC) and Baseband with PCI Interface AT76C506 Summary
Block Diagram
SPI Interface PCI Timers
ARM7TDMI Boot ROM
External Memory Interface
Common Memory Interface Controller
Decoder/ Arbiter/ Bridge
MAC Support Unit (MSU)
Interrupt Controller
Internal Memory (SRAM)
802.11b Baseband
WEP
Rev. 2352AS-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 AT76C506 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. The AT76C506 is a slave PCI device that allows Host access to any memory location of the device including the on-chip registers. Power management support conforming to PCI Power Management Specification v1.1 is also provided so that the device can be used for mini PCI applications. Besides the PCI interface unit, the AT76C506 contains a WEP engine block, a MAC Support Unit (MSU), a 802.11b Baseband controller, a memory controller and the ARM(R) 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(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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AT76C506
2352AS-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 trademark of Atmel. ARM7TDMI (R), ARM (R), and Thumb (R) are the registered trademarks of ARM, Ltd. Other terms and product names may be the trademarks of others.
Printed on recycled paper.
2352AS-WLAN-08/02 xM

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