Description
The Cirrus Logic CS22230 Wireless Network Controller enables high speed, 11 Mbps digital wireless connectivity for a variety of platforms including embedded systems, mobile applications, and other cost sensitive applications capable of supporting a standard Mini PCI or USB interface.

Features
Embedded ARM Core and System Support Logic
• High Performance ARM7TDMI RISC processor core at 77MHz
• 4KB integrated, one-way set associative, unified, write through cache
• Individual interrupt for each functional block
• Two 23-bit programmable (periodic or one-shot) general purpose timers
• 8 Dword (32-bits) memory write and read buffers for high system performance
• Abort cycle detection and reporting for debugging
• ARM performance monitoring function for system fine-tuning
• Programmable performance improvement logic based on system configuration
• Flexible independent DMA engines for Mini PCI and Digital Radio functional units

Enhanced Memory Controller Unit
• Programmable memory controller unit supporting SDRAM /async SRAM/boot ROM interface
• 16-bit data bus with 12-bit address supporting up to 4MB at up to 103MHz SDRAM
• 8-bit data bus with addressing support up to 1MB of boot ROM/Flash
• Programmable SDRAM timing and size parameters such as CAS latencies and number of banks columns and rows

FEC codec
• High performance Reed-Solomon coding for error correction (255:239 block coding)
• Reduces symbol error probability of a typical 10e-3 error rate environment to 10e-9
• Programmable rate FEC engine to optimize channel efficiency
• Low latency, fully pipelined hardware encoding and decoding. Support byte wise single cycle throughput up to 77MHz, with a sustain rate of 77MBps.
• Double buffering (64 Dword read/write buffer) to enhance system performance
• On the fly configuration of encoder and decoder

Digital Wireless Radio MAC
• Glue-less interface to 802.11b radio baseband transceiver
• 11Mbps data rate
• 32 Dword transmit/receive FIFO
• Supports clear channel assessment (CCA)

Power Management
• Host (Mini PCI) ACPI compliant
• Remote USB host wakeup
• Supports variable rate radio transmit, receive and standby radio power modes through two DACs

Clock and PLL Interface
• Single 44MHz crystal oscillator reference clock for Mini PCI version. 48MHz reference clock required in USB option.
• Internal PLL to generate internal and on board clocks

USB Controller Interface
• 12 Mbps USB 1.1 compliant device
• Supports 1 to 16 endpoints, endpoints can be bulk, isochronous or interrupt
• Variable endpoint buffer depths providing maximum flexibility for endpoint configurations
• Flexible configuration programming via EEPROM or firmware download
• Remote host wakeup

Mini PCI Controller Interface
• 33MHz 5V/3.3V Mini PCI 2.2 compliant master/target 32-bit data interface
• ARM communication with Mini PCI controller through simple mailbox scheme
• Generic Mini PCI controller programming interface
• Flexible configuration programming via EEPROM

Chip Processing and Packaging
• 208 MQFP package and 0.18 um state-of-the-art CMOS process
• 1.8 V core for low power consumption. 3.3V I/O and 5V tolerant