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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
廬
RISC Processor
Integrated 128-byte Transmit and 128-byte Receive FIFOs for Wireless MAC
Layer Functions
Delivers Standard Wireless Networking to Any Host that Supports a Full-speed
(12 Mbps) USB Interface
The On-chip Boot-ROM Implements the Device Upgrade Protocol (DFU) Spec Making
the AT76C505 Ideal for Low-cost Terminal Adaptors without Requiring External
Program Flash Since the Host Driver Downloads the Code During the Start-up Phase
Support of an External Serial EEPROM for Configuration Settings
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
Encryption
Hardware Implementation of Time Critical MAC Functions by the MAC Support Unit
(MSU) Guarantees Maximum Robustness
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
128-ball CABGA Package
Low-voltage 3.3V Operation
SPI Interface and 8 GPIO Pins
Baseband Supports Antenna Diversity Algorithm
Baseband Supports Japan Filter
Baseband Supports Differential or Single-ended I- and Q-Baseband Signals
Integrated 802.11b Baseband Processor
802.11b
Media Access
Controller
(MAC) and
Baseband with
USB Interface
AT76C505
Summary
Block Diagram
SPI Interface
USB Interface
Timers
ARM7TDMI
Boot ROM
External
Memory
Interface
Common Memory
Interface Controller
Decoder/
Arbiter/
Bridge
MAC Support
Unit (MSU)
Interrupt
Controller
Internal
Memory
(SRAM)
802.11b
Baseband
WEP
2364DS鈥揥LAN鈥?7/03
Note: This is a summary datasheet. A complete document is available
under NDA. For more information, please contact your local Atmel sales
office.
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ATMEL
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