AT76C505A Datasheet, PDF (1/3 Pages) ATMEL Corporation – 802.11b Media Access Controller (MAC) and Baseband with USB Interface

Features
• Integrates the IEEE 802.11b Physical Layer (Baseband) and the Media Access
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 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
• Integrates a Bootstrap ROM Supporting Device Firmware Upgrade (DFU) Protocol and
USB Chapter 9 Compatibility
• 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 9 GPIO Pins
• 144-ball LFBGA Package
• Low-voltage 1.8V Core Operation
Block Diagram
802.11b
Media Access
Controller
(MAC) and
Baseband with
USB Interface
AT76C505A
Summary
SPI Interface
USB
Interface
Timers
Boot ROM
External
Memory
Interface
Internal
Memory
(SRAM)
ARM7TDMI
MAC Support
Unit (MSU)
802.11b
Baseband
Decoder/
Arbiter/
Bridge
Interrupt
Controller
Encryption/
Decryption
Block
Rev. 2389BS–WLAN–07/03
Note: This is a summary document. A complete document is available
under NDA. For more information, please contact your local Atmel sales
1
office.