RTL8181 Wireless LAN Access Point/Gateway Controller DATA ...

RTL81811. OverviewRTL8181 is a highly integrated SoC, embedded with a high-performance 32-bit RISC microcontroller, Ethernet and WLANcontroller. It is a cost-effective and high-performance solution for the system of wireless LAN Access Point, wireless SOHOrouter, wireless Internet gateway, etc.System block diagram:EJTAGMicroprocessor802.11b MAC/BBRF transceiverTimerWatchdogUARTCache bufferMMUEthernet MAC0Ethernet MAC1MIIMIIEthernet PHYEthernet PHYLANWANGPIOMemory controllerPCI BridgePCI devicePCI deviceFlashSDRAMThe embedded processor of RTL8181 is Lexra LX5280 32bit RISC CPU, with 8K separate instruction and data caches. Aprotection unit (MMU) allows the memory be segmented and protected, and this unit is required in the modern operationsystem (e.g., Linux).The processor pipeline is a dual-issues and 6 stage architecture. The dual-issue CPU fetches two instructions per cycle, andwhich could allow two instructions are executed concurrently in two pipes via some instructions. Thus, its performance willachieve up to 30% improvement over uni-scalar architecture.Besides, it includes two fast Ethernet MACs, one could be used for LAN interface and the other one could connect to WANport. An IEEE 802.11b WLAN MAC+Baseband processor is embedded as well. By this build-in wireless controller, it couldsave a lot of costs and space comparing with the system designed with an external 802.11b adapter.The RTL8181 also integrates with memory controller, which allows customers use external SDRAM and Flash memory inglueless.A PCI interface is supported as well, which enables customers to plug in a PCI device seamlessly. For example, an IEEE802.11a device could be connected through this PCI interface to provide the WLAN dual mode service.FeaturesCore Processor? LX5280 32-bit RISC architecture.? Superscalar architecture, containing 2 execution pipelines with better performance? Embedded with 8K I-Cache, 8K D-Cache and 4K D-RAM.? MMU supported? Up to 200MHZ operating frequencyWLAN Controller? Integrated IEEE 802.11b complied MAC and DSSS Baseband processor? Support Tx data rate in 11M, 5.5M, 2M and 1M? Support long and short preamble? Support antenna diversity and AGC.? Embedded with encryption/decryption engine for 64 bits and 128 bits WEP4CONFIDENTIAL v1.0