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Networking Silicon — 82540EP
Datasheet 5
2.0 Features of the 82540EP Gigabit Ethernet Controller
2.1 PCI Features
2.2 MAC Specific Features
Features Benefits
PCI Revision 2.3 support for 32-bit wide interface at
33 MHz and 66 MHz
• Application flexibility for LAN on Motherboard
(LOM) or embedded solutions
• 64-bit addressing for systems with more than 4
Gigabytes of physical memory
• Support for new PCI 2.3 interrupt status/control
Algorithms that optimally use advanced PCI, MWI,
MRM, and MRL commands
• Efficient bus operations
CardBus Information Services (CIS) Pointer
• Enables CardBus operation (when used with
external FLASH device and series termination on
PCI bus)
CLKRUN# Signal • PCI clock suspension for low power mobile design
Features Benefits
Low-latency transmit and receive queues
• Network packets handled without waiting or buffer
overflow.
IEEE 802.3x compliant flow control support with
software controllable pause times and threshold
values
• Control over the transmissions of pause frames
through software or hardware triggering
• Frame loss reduced from receive overruns
Caches up to 64 packet descriptors in a single burst • Efficient use of PCI bandwidth
Programmable host memory receive buffers (256
Bytes to 16 KBytes) and cache line size (16 Bytes to
256 Bytes)
• Efficient use of PCI bandwidth
Wide, optimized internal data path architecture
• Low latency data handling
• Superior DMA transfer rate performance
64 KByte configurable Transmit and Receive FIFO
buffers
• No external FIFO memory requirements
• FIFO size adjustable to application
Descriptor ring management hardware for transmit
and receive
• Simple software programming model
Optimized descriptor fetching and write-back
mechanisms
• Efficient system memory and use of PCI
bandwidth
Mechanism available for reducing interrupts
generated by transmit and receive operations
• Maximizes system performance and throughput
Support for transmission and reception of packets up
to 16 KBytes
• Enables jumbo frames