DP83891 Gig PHYTER™ 10/100/1000M
© 2000 National Semiconductor Corporation
www.national.com
Subject to change Last Modified: 1/27/00 REVISION 0.0
Advance Information
January 2000
DP83891 Gig PHYTER
™
10/100/1000M
General Description
The DP83891 is the first fully integrated, feature rich Physi-
cal Layer transceiver with integrated PMD sublayers to sup-
port 10BASE-T,100BASE-TX and 1000BASE-T Ethernet
protocols. It operates on existing CAT5 cables which
reduces deployment costs.
The DP83891 is designed for easy implementation of
10/100/1000 Mb/s Ethernet LANs. It interfaces directly to
Twisted Pair media via an external standard Quad trans-
former. The DP83891 connects to the MAC layer through
the IEEE 802.3u Standard Media Independent Interface
(MII) or the IEEE 802.3z Gigabit Media Independent Inter-
face (GMII).
Applications
The DP83891 fits applications in:
■ 10/100/1000 Mb/s capable node cards
■ Switches with 10/100/1000 Mb/s capable ports
■ High speed uplink ports (backbone)
■ High end workstations
System Diagram
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
ETHERNET
DP83891
ETHERNET PHYSICAL LAYER
STATUS
LED
MAGNETICS
RJ-45
100BASE-TX
MII/GMII
MAC
100BASE-TX
CLOCK
125 MH
1000BASE-T
or
1000BASE-T
z
s
or
10/100/1000
10/100/1000 Mb/s
10BASE-T,
10BASE-T,
Features
■ Fully integrated 10BASE-T,100BASE-TX and
1000BASE-T capable
■ Single Quad TX-Transformer interface for all speeds
■ Fully compliant to IEEE 802.3u 100BASE-TX and IEEE
802.3z/ab 1000BASE-T specifications. Fully integrated
and fully compliant ANSI X3.T12 PMD physical sublayer
that includes adaptive equalization and Baseline Wan-
der compensation.
■ Supports Auto-MDIX
■ IEEE 802.3u Auto-Negotiation and Parallel Detection
– Fully auto-negotiatesbetween 10, 100 and 1000 Mb/s
full duplex and half duplex devices
■ 3.3 V MAC interfaces:
– IEEE 802.3u MII
– IEEE 802.3z GMII
■ LED support (Link, Speed, Activity, Duplex, Collision,
Auto-Negotiation, TX and RX indications)
■ Management Register Set (MDIO and MDC)
■ Single 3.3 V power supply
– 5 V tolerant I/Os
■ 208-pin PQFP package
