CS22250

Features:

Embedded ARM Core and System Support Logic
• High Performance ARM7TDMI RISC processor core up to 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.
Enhanced Memory Controller Unit
• Programmable memory controller unit supporting SDRAM /async SRAM/boot ROM/Flash interface
• 16-bit data bus with 12-bit address supporting up to 4MB and up to 103 MHz (100/133MHz 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
• Flexible independent DMA engines for Ethernet MAC, Digital Radio and External Bus functional units FEC codec
• High performance Reed-Solomon coding for error correction (255:239 block coding)
• Reduces 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. Supports byte-wise single cycle throughput up to 77MHz, with a sustain rate of 77MBps
• Double buffering (63 Dword read/write buffer) to enhance system performance
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)
Ethernet Interface
• IEEE802.3 Ethernet MAC controller
• Two independent full-duplex DMA channels transfer between Ethernet interface to system memory
• Standard 7-pin serial interfaces to AUI or Twisted Pair 10-BaseT
• Standard half-duplex CSMA/CD and full-duplex operation
USB Device Configuration Interface
• USB 1.1 compliant
Power Management
• ACPI compliant
• Programmable sleep timer for ARM core and system power management
• Independent power management control for individual functional blocks
• Supports variable rate radio transmit, receive and standby radio power modes
Clock and PLL Interface
• Single 44MHz crystal oscillator reference clock
• Internal PLL to generate internal and on board clocks
Chip Processing and Packaging
• 208 FPBGA package and 0.18um state of the art CMOS process
• 1.8 V core for low power consumption. 3.3V I/O
High Speed Parallel Interface
• Multi-purpose 32bit bus for connecting with other high speed devices
• Supports operations at ½ the speed of the ARM clock (up to 38MHz)
• Two independent full-duplex DMA channels transfer between external devices to ARM system memory
• Supports one external interrupt pin to the ARM core


Description

The Cirrus Logic CS22250 Wireless Network Controller enables high speed, 11 Mbps digital wireless data connectivity for wireless Ethernet bridge, access points, and other broadband applications.

The CS22250 is a highly integrated single-chip Ethernet bridge solution for wireless networks supporting video, audio, voice, and data traffic. The programmable controller executes Cirrus Logic's Whitecap™2 networking protocol that provides Wi-Fi™ (802.11b) compliance, multimedia and a foundation for quality of service (QoS) applications, and Ethernet to wireless bridging. The device includes several high performance components including an ARM7TDMI RISC processor core, a Forward Error Correction (FEC) codec, and a wireless radio MAC supporting up to 11 Mbps throughput. The CS22250 utilizes state of the art 0.18um CMOS process and is housed in a 208 FPBGA compact package, offering low-lead inductance suitable for highly integrated radio applications. The core is powered at 1.8 V with 3.3V I/O to reduce overall power consumption. In addition, the CS22250 supports various power management modes for host, MAC, baseband, and radio interfaces.

The CS22250 is designed to provide integrated low cost IEEE 802.3 standard compliant system solutions. The controller also incorporates a high-speed parallel interface, which can be used to  interface with other ASICs (eg: HNPA 2.0 Network controller) to implement a variety of other wireless LAN bridging products.