SUNNYVALE, CALIF. AMD's Am79C976 PCnet-PRO fast Ethernet controller processes large packets of data using standard Ethernet technology, rather than sending the data piecemeal.
The device supports Ethernet frames up to 64 kbytes long, which allows for multiprotocol frame encapsulation. It is also useful in backplane communications and as a LAN interface for routers, said David Somo, vice president of marketing for AMD's Computation Products Group. The controller enables up to 4 Mbytes of external SRAM for extra packet storage and the offload of system memory for proxy servers, access concentrators and LAN-to-WAN routers.
The PCnet-PRO supports IEEE standards including 802.1D traffic prioritization, 802.1Q virtual LANs and 802.3 flow control. Somo said standards support enables efficient use of network bandwidth, which is important for Internet telephony, secure switched networks, virtual private network bridges, Web servers and network-attached storage devices.
Included with the device are an IEEE 802.3-compliant Fast Ethernet media-access controller with full autonegotiation of 10- or 100-Mbit/second and half- or full-duplex operation, and a media-independent interface for connection to any standard IEEE 802.3-compliant 10/100-Mbit/s Ethernet physical layer (PHY) device.
There is also an external address detection interface for use with content addressable memories to perform hardware-based address filtering for high-speed routers. It can be used without a PHY for backplane communications within a chassis-based system.
The controller also contains a high-performance 32-bit PCI bus master interface and direct memory access architecture with programmable interrupts to provide high-speed data throughput and lower CPU and system bus utilization. The controller is specified from -40 degrees C to 85 degrees C. It is housed in a 208-pin plastic quad flat pack and priced at $9.95 in quantities of 10,000.
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EETInfo No. 623