AT76C502A Datasheet, PDF (1/3 Pages) ATMEL Corporation – 11-megabit WLAN Media Access Controller MAC

Features
• 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
• 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
• Enciphering/Deciphering of Wireless Data On-the-fly by the Implementation of the
Encryption/Decryption Code Ensures Maximum Privacy of Data
• The Integrated Physical Attachment Interface (PAI) Fully Supports Direct-sequence
Spread Spectrum and Frequency-hopping Spread Spectrum (2 Mbps) Physical-layer
Interfaces
• 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
• 144-lead TQFP Package
• Low-voltage 3.3V Operation
• Internal ROM Contains Hardwired CIS Information for Automatic Configuration when
Card is Inserted in the PCMCIA Slot or Reads Custom CIS Information from SPI
Memory
• Offers SPI interface and 3 GPIO Pins
• AT76C502A Offers the Option to Download the Whole Code from SPI DataFlash^® or an
Option to Eliminate Flash by Downloading the Program from the Mass Storage Device
Block Diagram
11-megabit
WLAN Media
Access
Controller
(MAC)
AT76C502A
Summary
PCMCIA Interface
Timers
External
Memory
Interface
Internal
Memory
ARM7TDMI
Wireless Physical
Attachment
Interface (PAI)
Decoder/
Arbiter/
Bridge
Interrupt
Controller
WEP
1948DS–WLAN–09/03
Note: This is a summary document. A complete document is avail-
able under NDA. For more information, please contact your local
Atmel sales office.