Features
•
Integrates the IEEE 802.11b Physical Layer (Baseband) and the Media Access
•
•
•
•
•
•
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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 func-
tionality 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 architec-
ture 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 Periph-
eral 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 consist-
ing 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 operat-
ing mode can be changed at run time with negligible overhead.
2
AT76C504A
2388CS–WLAN–07/03
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Disclaimer:
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 Corporation 2003. All rights reserved.
Atmel
®
and combinations thereof, and DataFlash
®
are the
registered trademarks of Atmel Corporation or its subsidiaries. ARM7TDMI
®
, ARM
®
, and Thumb
®
are 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
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