dp83840a National Semiconductor Corporation, dp83840a Datasheet

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dp83840a

Manufacturer Part Number
dp83840a
Description
10/100 Mb/s Ethernet Physical Layer
Manufacturer
National Semiconductor Corporation
Datasheet

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Version A
DP83840A
10/100 Mb/s Ethernet Physical Layer
General Description
The DP83840A is a Physical Layer device for Ethernet
10BASE-T and 100BASE-X using category 5 Unshielded,
Type 1 Shielded and Fiber Optic cables.
This VLSI device is designed for easy implementation of
10/100 Mb/s Ethernet LANs. It interfaces to the PMD sub-
layer through National Semiconductor's DP83223 Twisted
Pair Transceiver, and to the MAC layer through a Media
Independent Interface (MII), ensuring interoperability
between products from different vendors.
The DP83840A is designed with National Semiconductor's
BiCMOS process. Its system architecture is based on the
integration of several of National Semiconductor's industry
proven core technologies:
System Diagram
10 AND/OR 100 Mb/s
ETHERNET MAC OR
REPEATER/SWITCH
10BASE-T ENDEC/Transceiver module to provide the 10
Mb/s IEEE 802.3 functions
Clock Recovery/Generator Modules from National
Semiconductor's leading FDDI product
FDDI Stream Cipher (Cyclone)
100BASE-X physical coding sub-layer (PCS) and control
logic that integrate the core modules into a dual speed
Ethernet physical layer controller
PORT
MII
ETHERNET PHYSICAL LAYER
CLOCKS
10/100 Mb/s
DP83840A
STATUS
LEDS
1
Features
• IEEE 802.3 10BASE-T compatible--ENDEC and UTP/
• IEEE 802.3u 100BASE-X compatible--support for 2 pair
• ANSI X3T12 TP-PMD compatible
• IEEE 802.3u Auto-Negotiation for automatic speed
• IEEE 802.3u compatible Media Independent Interface
• Integrated high performance 100 Mb/s clock recovery
• Full Duplex support for 10 and 100 Mb/s
• MII Serial 10 Mb/s output mode
• Fully configurable node and repeater modes--allows
• Programmable loopback modes for easy system
• Flexible LED support
• IEEE 1149.1 Standard Test Access Port and Boundary-
• Small footprint 100-pin PQFP package
• Individualized scrambler seed for multi-PHY applications
STP transceivers and filters built-in
Category 5 UTP (100m), Type 1 STP and Fiber Optic
Transceivers--Connects directly to the DP83223 Twisted
Pair Transceiver
selection
(MII) with Serial Management Interface
circuitry requiring no external filters
operation in either application
diagnostics
Scan compatible
TRANSCEIVER
TRANSCEIVER
10BASE-T
100BASE-TX
100BASE-FX
National Semiconductor
DP83223
100BASE-TX
March 1997
10BASE-T
RJ-45
OR

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