CS22220

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 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 PCMCIA and digital radio 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 Radio MAC Interface
• Glue-less interface to 802.11b baseband transceivers
• Up to 11Mbps data rates
• 32 Dword transmit/receive FIFO
• Supports clear channel assessment (CCA)
Power Management
• Host (PCMCIA) ACPI compliant
• Programmable sleep timer for ARM core and system low power management
• Independent power management control for individual functional units
• 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
PCMCIA Interface
• 16 bit PCMCIA I/O target device supporting memory map or program I/O using 11 address bits
• Independent DMA controller to transfer data between PCMCIA and main memory
• Fully compliant with PCMCIA 2.1/JEIDA 4.2 standard
• Supports big endian and little endian (default) data formats
• Supports custom mode for embedded applications where the interface becomes a generic
memory address/data interface
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 - 5V tolerant I/O


Description

The Cirrus Logic CS22220 Wireless Network Controller enables high performance, 11 Megabits per second digital wireless data connectivity for PCMCIA, mobile, embedded systems and other cost sensitive applications.

The CS22220 is a highly integrated single-chip PCMCIA 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 as well as multimedia and quality of service (QoS) support. 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 to11 Mbps throughput. The CS22220 utilizes state of the art 0.18um CMOS process and is housed in a 208 FPBGA compact (15mm x 15mm) package, which has low-lead inductance suitable for highly integrated radio applications. The core is powered at 1.8 V with 3.3V (5.0V tolerant) I/O to reduce overall power consumption. In addition, the CS22220 supports low power management for the host and radio interfaces.

The CS22220 is designed to be an integral part of a PC card (PCMCIA 2.1/JEIDA 4.2). The PCMCIA host interface also supports both little endian and big endian protocol for easy interfacing to popular microprocessors in embedded system applications.