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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
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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
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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. 2218CS鈥揥LAN鈥?1/03
Note: This is a summary datasheet. A complete datasheet is
available under NDA. For more information, please contact your
local Atmel Sales Office.
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