Features: • USB host interface supports USB V1.1 at 12Mbps.• 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 l...
ISL3871A: Features: • USB host interface supports USB V1.1 at 12Mbps.• New Start up modes allow the PCMCIA card information structure to be initialized from a serial EEPROM. This allows firmware t...
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The Intersil ISL3871A Wireless LAN Integrated Medium Access Controller with Integrated Baseband Processor is part of the PRISM® 2.4GHz radio chipset. The ISL3871A directly interfaces with the Intersil's Zero-IF QMODEM(ISL3684). Adding Intersil's Power Amp (ISL3984) offers the designer a complete end-to-end WLAN chipset solution. Protocol and PHY support are implemented in firmware, thus supporting customization of the WLAN solution.
Firmware implements the full IEEE 802.11 Wireless LAN MAC protocol. It supports BSS and IBSS operation under DCF, and operation under the optional point coordination function (PCF). Low level protocol functions such as RTS/CTS generation and acknowledgment, fragmentation and de-fragmentation, and automatic beacon monitoring are handed without host intervention. Active scanning is performed autonomously once initiated by host command. Host interface command and status handshakes allow concurrent operations from multi-threaded I/O drivers. Additional firmware functions specific to access point applications are also available.
The ISL3871A has on-board A/D's and D/A for analog I and Q inputs and outputs, for which the ISL3684 Zero-IF QMODEM is recommended. Differential phase shift keying modulation schemes DBPSK and DQPSK, with data scrambling capability, are available along with Complementary Code Keying to provide a variety of data rates. Both Receive and Transmit AGC functions with 7-bit AGC control obtain maximum performance in the analog portions of the transceiver.
Built-in flexibility allows the ISL3871A to be configured through a general purpose control bus, for a range of applications. The ISL3871A is housed in either a thin plastic BGA package or a TQFP flat pack suitable for PCMCIA board applications.
The ISL3871A is designed to provide maximum performance with minimum power consumption. External pin layout is organized to provide optimal PC board layout to all user interfaces including PCMCIA and USB.