GENERAL DESCRIPTION
An integrated dual Ethernet MAC, the W90N740, is designed for use in broadband routers, wireless access points, residential gateways and LAN camera. And achieves 80MHz under worse conditions. It designs as Harvard architecture by offering an 8Kbyte 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 32bit 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.
Winbond Electronics Corporation
