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Intel 8255x 10/100 Mbps Ethernet Controller Family Open Source Software Developer Manual 7
Adapter and Controller Overview
• Optional Flash support up to 64 Kbytes. (The 82557 is capable of larger Flash size support.)
2.2.3 82559, 82550, 82551, and 82562 Features
The 82559, 82550, and 82551 devices are supersets of the 82557 and 82558. However, the 82559
does not support PHY based flow control as the 82558 did. The new 82559 features are:
• Backward compatible to the 82557 and 82558 software.
• Low power 3.3 V device:
• Clockrun protocol support.
• System Management Bus (SMB) support.
• Wired for Management support (WfM).
• Expanded Wake on LAN capabilities.
• 128 Kbytes Flash size support. (The 82558 only supported a 64 Kbyte Flash.)
• Thin ball grid array (BGA) 15 x 15 mm package.
2.2.3.1 82559ER Features
The 82559ER is a member of the 82559 Fast Ethernet controllers. It is a subset of the 82559.
However, the 82559ER does not support:
• SMB.
• Wake on Magic Packet*.
2.2.3.2 82551ER Features
The 82551ER is a member of the 82559 Fast Ethernet controllers. It is a subset of the 82551.
However, the 82551ER does not support:
• SMB.
• Wake on Magic Packet*.
• Checksumming.
2.3 Working with the Physical Layer
The 82557 contains an IEEE MII compliant interface to a MII compliant PHY, allowing
connections to 10/100 Mbps networks. Software communicates to a MII compliant device through
the 82557 by using the its Management Data Interface (MDI) port.
The 82558, 82559, 82550 and 82551 contain an embedded PHY module. Although the PHY is
internal for these devices, software still communicates to the PHY unit through the MDI port.
For 10/100 Mbps connections, the 82557 can be used in conjunction with the Intel
®
82555. For 10
Mbps only connections, the 82557 can be interfaced to the Intel
®
82503 serial interface, while
maintaining software compatibility to 100 Mbps solutions. The 82558 and later devices do not
have a 10 Mbps only interface as the 82557. However, it is possible to interface these devices with
a 10 Mbps only MII device.