W90N740

The W90N740 micro-controller is 16/32 bit, ARM7TDMI based RISC micro-controller for network as well as embedded applications. An integrated dual Ethernet MAC, the W90N740, is designed for use in broadband routers, wireless access points, residential gateways and LAN camera.
The W90N740N is built around The ARM7TDMI CPU core designed by Advanced RISC Machines, Ltd. And achieves 80MHz under worse conditions. Its small size, fully static design is particularly suitable for cost-sensitive and power-sensitive applications. W90N740 designs as Harvard architecture by offering an 8K-byte I-cache/SRAM and an 2K-byte D-cache/SRAM with flexible configuration and two way set associative structure to balance data movement between CPU and external memory. Four stages write buffer also improves latency for write operations.
The external bus interface (EBI) controller provides single bus architecture, 8/16/32 bit data width to access external SDRAM, ROM/SRAM, flash memory and I/O devices. It achieves same frequency as CPU core to minimize latency if internal cache misses. Memory controller supports different kinds of SDRAM types and configurations to ease system design. The System Manager includes an internal 32-bit system bus arbiter and a PLL clock controller. Generic I/O bus is easily served as PCMCIA-like interface for 802.11b wireless LAN connection.
Two 10/100Mb MACs of Ethernet controller is built in to reduce total system cost and increase performance between WAN and LAN port. Either MII or RMII of MAC is selected for external 10/100 PHY chip to design for varieties of applications. A powerful NAT accelerator (Patent Pending) between LAN and WAN reduces the software loading of CPU and speeds up performance between LAN and WAN.
W90N740 integrates root hub of USB 1.1 host controller with one port transceiver and uses additional port with xternal transceiver if necessary, which can add valuable functions like flash disk, printer server, Bluetooth device via  SB port. The important peripheral functions include one full wired high speed UART channel, 2-Channel GDMA, one  watch-dog timer, two 24-bit timers with 8-bit pre-scale, 20 programmable I/O ports, and an advanced interrupt  ontroller.