SLXT973QC Cortina Systems Inc, SLXT973QC Datasheet - Page 23

• Manufacturer Part Number: SLXT973QC
• Manufacturer: Cortina Systems Inc

Specifications of SLXT973QC

• Lead Free Status / Rohs Status: Not Compliant

LXT973 Transceiver
Datasheet
249426, Revision 6.0
13 July 2007
3.0
3.1
3.1.1
3.2
3.2.1
Cortina Systems
Functional Description
Introduction
The Cortina Systems
(LXT973 Transceiver) is an IEEE-compliant, dual-port, Fast Ethernet PHY transceiver that
directly supports both 100BASE-TX and 10BASE-T applications. The device incorporates
full Media Independent Interface (MII), enabling each individual network port to connect
with 10/100 Mbps MACs. Each port directly drives either a 100BASE-TX line or a
10BASE-T line (up to 160 meters). The LXT973 Transceiver also supports 100BASE-FX
operation via an LVPECL interface. The device uses a 100-pin QFP package.
Comprehensive Functionality
The LXT973 Transceiver performs all functions of the Physical Coding Sublayer (PCS)
and Physical Media Attachment (PMA) sublayer as defined in the IEEE 802.3 100BASE-X
specification. This device also performs all functions of the Physical Media Dependent
(PMD) sublayer for 100BASE-TX connections.
On power-up, the LXT973 Transceiver reads its configuration inputs to check for forced
operation settings. If not configured for forced operation, each port uses auto-negotiation/
parallel detection to automatically determine line operating conditions. If the link partner
supports auto-negotiation, the LXT973 Transceiver auto-negotiates with it using Fast Link
Pulse (FLP) Bursts. If the PHY partner does not support auto-negotiation, the LXT973
Transceiver automatically detects (parallel detection) the presence of either link pulses
(10 Mbps PHY) or IDLE symbols (100 Mbps PHY) and sets its operating conditions
accordingly. When parallel detection is used to establish link, the resulting link is at half-
duplex. The LXT973 Transceiver provides half-duplex and full-duplex operation at
100 Mbps and 10 Mbps.
Interface Descriptions
10/100 Mbps Network Interface
The LXT973 Transceiver supports both 10BASE-T and 100BASE-TX Ethernet over
twisted-pair, or 100 Mbps Ethernet over fiber media (100BASE-FX). Each network
interface port consists of four external pins (two differential signal pairs). The pins are
shared between twisted-pair and fiber.
The LXT973 Transceiver output drivers generate either 100BASE-TX, 10BASE-T, or
100BASE-FX output. When not transmitting data, the device generates IEEE 802.3-
compliant link pulses or IDLE code. Input signals are decoded either as a 100BASE-TX,
100BASE-FX, or 10BASE-T input, depending on the mode selected. Auto-negotiation/
parallel detection or manual control is used to determine the speed of this interface.
Polarity is determined by the MDI crossover function.
®
LXT973 10/100 Mbps Dual-Port Fast Ethernet PHY Transceiver
®
LXT973 10/100 Mbps Dual-Port Fast Ethernet PHY Transceiver
3.0 Functional Description
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