LU82551ER 860613 Intel, LU82551ER 860613 Datasheet - Page 12
LU82551ER 860613
Manufacturer Part Number
LU82551ER 860613
Description
Manufacturer
Intel
Datasheet
1.LU82551ER_860613.pdf
(104 pages)
Specifications of LU82551ER 860613
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82551ER — Networking Silicon
2.3
2.4
4
10/100 Mbps Serial CSMA/CD Unit Overview
The 82551ER’s CSMA/CD unit allows it to be connected to a 10 or 100 Mbps Ethernet network at
half or full duplex. The CSMA/CD unit performs all of the functions of the 802.3 protocol such as
frame formatting, frame stripping, collision handling, deferral to link traffic, etc.
10/100 Mbps Physical Layer Unit
The integrated Physical Layer (PHY) unit of the 82551ER allows connection to either a 10 or 100
Mbps Ethernet network. The PHY supports Auto-Negotiation for 100BASE-TX Full Duplex,
100BASE-TX Half Duplex, 10BASE-T Full Duplex, and 10BASE-T Half Duplex. Three LED
pins indicate link status, network activity, and speed.
•
•
•
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Tunable transmit FIFO threshold allows elimination of underruns while concurrent transmits
are being performed.
Extended PCI zero wait state burst accesses to and from the 82551ER for both transmit and
receive FIFOs
Efficient re-transmission of data directly from the transmit FIFO when physical or data link
errors (collision detection or data underrun) are encountered, increasing performance by
eliminating the need to re-access the data from host memory
Automatic discard of incoming runt receive frames
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