ETC AT76C506

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® 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
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 CABGA Package
Low-voltage 3.3V Operation
SPI Interface and 2 GPIO Pins
AT76C506 Offers the Option to Download the Whole Code from SPI DataFlash® 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
Media Access
(MAC) and
Baseband with
PCI Interface
Block Diagram
SPI Interface
Common Memory
Interface Controller
Boot ROM
MAC Support
Unit (MSU)
Rev. 2352CS–WLAN–01/03
Note: This is a summary datasheet. A complete document is
available under NDA. For more information, please contact your
local Atmel Sales Office.
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®
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.
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