(See ordering part number below) LE2020™ multip-port chip: low power, 2 Gbps Ethernet ports, 4Gbps, 256K concurrent sessions, PCI interface LeWiz's TCP/IP Offload Engine Chip (LE2020™) is designed to off-load TCP/IP processing from the host processor(s). It solves bottlenecks in high-performance networked systems such as servers, storage, and networked appliances. This takes the main processor(s) out of the TCP/IP loop, so that it no longer performs the major TCP/IP tasks in software. This balanced approach allows the main processor to utilize most of its bandwidth to run applications. The LE2020™ connects directly to network interface devices such as MACs and supports 2 Gigabit Ethernet ports. The LE2020™ accelerates the TCP/IP processing at lightning speed thus reducing network latency and overhead in network attached systems. It has the capability of handling a load of up to 256 thousand concurrent connections. TCP/IP is a protocol used to communicate server to server, server to PC, server to storage, server to network appliance, and the list of applications continues to expand. Unfortunately, TCP/IP places a very heavy burden on host CPUs. At Ethernet speeds of 10/100, most CPUs can handle the TCP/IP processing overhead. It is a standard rule of thumb that a CPU of 1KHz is required to process TCP overhead associated with transfering data 1Kbit/sec. With the advent of gigabit Ethernet, server CPUs have begun to choke while processing the TCP/IP overhead associated with transferring data. Since every Ethernet port is bi-directional that means that each port consumes 1Gbps in and 1Gbps out. So the host processor handling two ports has to run at 4GHz just to process the TCP/IP protocol. When this happens, the application that is being used, comes to a complete stop. The obvious solution is a TCP/IP Offload Engine (TOE) like the LE2020™. This chip offloads the TCP/IP processing from the host CPUs, freeing up valuable CPU cycles for application processing while maintaining the programmability, configurability, and flexibility via the host interface. It also supports fail-over protection/alternate pathing and load balancing/trunking capabilities required in high-performance server and storage systems. The result is faster servers, an accelerated network, superior application performance, saving cost and improve reliability for the enterprise network. The LE2020™ is ideal for network intensive environments, such as file serving, network attached storage (NAS), high performance technical computing, high-end backup and restore, IP storage, and video serving. Using LeWiz's advanced layer-processing architecture, the LE2020™ offers the highest performance, lowest power and most cost effective way of addressing the performance bottlenecks found in many IP network attached equipment. Benefits Low power, NO heatsinks Lowers overall network cost      - 2 bi-directional ports (4Gbps)      - Increases throughput and load on system      - Delay new purchase of hardware and software      - Reduced heat, better reliability, less downtime Enhances and balances system performance      - 256K concurrent connections      - Allows processor to run applications efficiently Optimize the network efficiency Enhances system security      - Achieve wire speed, full duplex Reduces network maintanence and service cost Non-intrusive to system hardware and software Lead-Free Features Performs TCP/IP functions in hardware, not software, for lowest latency and overhead Line rate performance at multi Gigabit speeds scaleable to 10Gbps Multi-ports and capable of maintaining millions of concurrent TCP sessions Requires minimal host CPU performance while utilizing minimum power with no heat sink Includes security protection Supports zero buffer copy mode Full TCP/IP Session termination for maximum host CPU off-load Supports RDMA, iSCSI Full debug/diagnostic capabiliy Handle MACs directly without CPU intervention On chip DMA engine for high speed data movement and throughput Contains a 64-bit PCI bridge on chip for interfacing to multi-port MACs & the host system bus Interfaces directly to many popular Gigabit MACs Interfaces directly with external CPU (optional) Compatible with off-the-shelf host bridge chips for optimum system performance Fits in standard system buses – a drop-in for many systems Supports Linux, Windows, and Solaris Product Specifications                Figure 1: TCP/IP Offload Engine Chip LE2020™ Product Functionality Compatible with PCI 2.2 standard 64 bit, 66/33MHz, 3.3V PCI bus interface Low cost, low power external SDRAMs Concurrent operation on primary and secondary bus interfaces Concurrent transmit and recieve operations Buffers optimized for fast packet & stream transfers On-chip phase lock loops for low external clock skew Full software support with device drivers, utilities and reference design TCP/IP Features Supported Full TCP/IP offload Non-intrusive to existing TCP/IP stack Reassemembly of incoming data Sequence ordering - handling out of order segments Overlap elimination - handling duplicate segments Re-transmission, Flow control, etc. TCP timer handling Connection set up and tear down Hardware checksum processing Window scaling, updating, and sizing Applications    Figure 2: Dual Gigabit Host Bus Adapter with LE2020™ Ordering Part#: (Please specify your specific OS version when ordering) LE2020 back to top