Intel 82540EP manual HostOffloading, PHY Specific Features

82540EP — Networking Silicon

2.3PHY Specific Features

	Features			Benefits
	Integrated PHY for 10/100/1000 Mbps full and half		•	Smaller footprint and lower power dissipation
	duplex operation			compared to multi-chip MAC and PHY solutions
	IEEE 802.3ab Auto-Negotiation support		• Automatic link configuration including speed,
				duplex, and flow control
	IEEE 802.3ab PHY compliance and compatibility		• Robust operation over the installed base of
				Category-5 (CAT-5) twisted pair cabling
	State-of-the-art DSP architecture implements digital		•	Robust performance in noisy environments
	adaptive equalization, echo cancellation, and cross-		•	Tolerance of common electrical signal
	talk cancellation			impairments
	PHY ability to automatically detect polarity and cable		•	Easier network installation and maintenance
	lengths and MDI versus MDI-X cable at all speeds		•	End-to-end wiring tolerance
	Features			Benefits
	Transmit and receive IP, TCP and UDP checksum off-		•	Lower CPU utilization
	loading capabilities
			• Increased throughput and lower CPU utilization
	Transmit TCP segmentation		•	Large send offload feature (in Microsoft*
				Windows* XP) compatible
			• 16 exact matched packets (unicast or multicast)
			• 4096-bit hash filter for multicast frames
	Advanced packet filtering		•	Promiscuous (unicast and multicast) transfer
				mode support
			• Optical filtering of invalid frames
	IEEE 802.1q VLAN support with VLAN tag insertion,		• Ability to create multiple virtual LAN segments
	stripping and packet filtering for up to 4096 VLAN tags
	Descriptor ring management hardware for transmit		• Optimized fetching and write-back mechanisms for
				efficient system memory and PCI bandwidth
	and receive
				usage
2.4	HostOffloading	Features
	16 KByte jumbo frame support		•	High throughput for large data transfers on
				networks supporting jumbo frames
	Interrupt coalescing (multiple packets per interrupt)		• Increased throughput by reducing interrupts
				generated by transmit and receive operations

6 Datasheet