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82551ER Fast Ethernet PCI Controller Networking Silicon - 82551ER

Intel® 82551ER Fast Ethernet PCI Controller Datasheet


This datasheet is applicable to the Intel® 82551ER Fast Ethernet PCI Controller, a member of the 8255x Fast Ethernet Controller family.


The 82551ER is an evolutionary addition to Intel’s family of 8255x controllers. It provides excellent performance by offloading TCP, UDP and IP checksums and supports TCP segmentation off-load for operations such as Large Send.

Its optimized 32-bit interface and efficient scatter-gather bus mastering capabilities enable the 82551ER to perform high speed data transfers over the PCI bus. This capability accelerates the processing of high level commands and operations, which lowers CPU utilization. Its architecture enables data to flow efficiently from the bus interface unit to the 3 KB Transmit and Receive FIFOs, providing the perfect balance between the wire and system bus. In addition, multiple priority queues are provided to prevent data underruns and overruns.

The 82551ER includes both a MAC and PHY. In also has a simple interface to the analog front end, which allows cost effective designs requiring minimal board real estate. The 82551ER is pin compatible with the 82559 family of controllers and is offered with software that provides backwards compatibility with previous 82559ER controllers.

Read the full Intel® 82551ER Fast Ethernet PCI Controller Datasheet.

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