The Intersil HFA3842 Wireless LAN Medium Access Controller is part of the PRISM? 2.4GHz radio chip set. The HFA3842 directly interfaces with the Intersil HFA386x family of Baseband Processors, offering a complete end-to-end chip set solution for wireless LAN products. Protocol and PHY support are implemented in firmware to allow custom protocol and different PHY transceivers.

Features

? New start up modes allow the PCMCIA Card Information Structure to be initialized from a serial EEPROM. This allows firmware to be downloaded from the host, eliminating the parallel Flash memory device.

? Firmware can be loaded from serial Flash memory.

? Direct attachment to a typical x16 SRAM using five control signals (RAMCS_, MOE_, MWEL_, MLBE_, and MUBE_).

? Low frequency crystal oscillator to maintain time and allow baseband clock source to power off during sleep mode.

? Improved performance of internal WEP engine.

? On-chip execution can now be viewed while in debug mode.

? Independent programmable cycle timing for external chip selects allows attachment of slow memory devices without compromising higher speed instruction execution.

? Pinout is backward compatible with HFA3841.

? IEEE802.11 Standard Data Rates: 1, 2, 5.5 and 11Mbps

? Part of the Intersil PRISM Wireless LAN Chip Set

? Full Implementation of the MAC Protocol Specified in IEEE Standards 802.11-1999 and 802.11b

? PCMCIA Host Interface Supports Full 16-Bit Implementation of PC Card 16 (1995), also ISA PNP with Additional Chip

? Host Interface Provides Dual Buffer Access Paths

? External Memory Interface Supports up to 4M bytes RAM

? Internal Encryption Engine Executes IEEE802.11 WEP

? Low Power Operation; 25mA Active, 8mA Doze, <1mA Sleep

? Operation at 2.7V to 3.6V Supply

? 5V Tolerant Host Interface Input/Outputs

? 128 Pin LQFP Package Targeted for Type II PC Cards

? IEEE802.11 Wireless LAN MAC Protocol Firmware and Microsoft? Windows? Software Drivers

? Pin for Pin Replacement for the HFA3841 Supporting all Functions and operations of the HFA3841

Applications

? High Data Rate Wireless LAN

? PC Card Wireless LAN Adapters

? PCI Wireless LAN Cards (Using Ext. Bridge Chip)

? Wireless LAN Modules

? Wireless LAN Access Points

? Wireless Bridge Products

? Wireless Point-to-Multipoint Systems

? ISA, ISA PNP WLAN Cards