Features: •Firmware implements the full IEEE 802.11b/g Wireless LAN MAC protocols
•Internal WEP Engine allows 64 or 128 bit Encryption
•AES Hardware Accelerator
•Start-up-modes allow the PCI configuration registers or the card bus card information structure to be initialized from a small external serial EEPROM. This allows firmware to be downloaded from the host.
•On-chip SRAM memory
•A low frequency crystal oscillator can maintain time, which allows the high frequency clock source to be powered off during sleep mode.
•Firmware controlled antenna diversity
•Data Rates. . . 1,2,5.5,6,9,11,12,18,24,36,48,and 54Mbps
•Modulation . . . .OFDM with BPSK,QPSK,16QAM,64QAM DBPSK, DQPSK, CCK
•Convolutional coding and interleaving on all OFDM rates
•Targeted for OFDM Multipath Delay Spreads from > 800ns for 6 Mbps to > 100ns for 54Mbps
•Targeted for CCK Multipath Delay Spreads > 90ns at 11Mbps, >200 ns at 5.5 Mbps, and >360ns at 1 and 2Mbps
•Direct interface with the ISL3680 Direct Conversion TransceiverApplication•High Data Rate Wireless LAN Systems Targeting the IEEE 802.11b/g Standards.
•Cardbus32 Wireless LAN Adapters
•Mini-PCI Wireless LAN Cards
•3V PCI Wireless LAN AdaptersDescriptionThe Intersil ISL3880 Wireless LAN Integrated Media Access Controller with Baseband Processor is part of the PRISM GTi™ radio chipset. The ISL3880 directly interfaces with the Intersil's ISL3680 Direct Conversion Transceiver with AGC and synthesizer. Adding Intersil's ISL3090 10GHz VCO and Intersil's ISL3980 Power Amp completes an end-to-end WLAN Chipset solution for the 2.4GHz 802.11b/g standards. The 802.11Protocol is implemented in firmware to provide for custom WLAN solutions.
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 handled 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.
Orthogonal Frequency Division Multiplexing (OFDM) modulated with BPSK, QPSK, 16 QAM, or 64 QAM and a variety of convolutional coding rates provides 8 selectable data rates. Differential phase shift keying modulation schemes, DBPSK and DQPSK with data scrambling capability along with Complementary Code Keying provide an additional 4 selectable data rates.
Built-in flexibility allows the ISL3880 to be configured for a range of applications. The MAC is based on the ARM 946E processor core that offers a wide variety of code development support tools.
The ISL3880 is housed in a thin plastic BGA package suitable for CardBus or Mini-PCI circuit card applications.
ISL3880 Data Sheet
