SLXT973QE Cortina Systems Inc, SLXT973QE Datasheet - Page 35

• Manufacturer Part Number: SLXT973QE
• Manufacturer: Cortina Systems Inc

Specifications of SLXT973QE

• Lead Free Status / RoHS Status: Not Compliant

LXT973 Transceiver
Datasheet
249426, Revision 6.0
13 July 2007
3.7.2
3.7.3
3.7.4
3.7.5
Cortina Systems
Twisted-Pair Interface
When operating at 100 Mbps, the LXT973 Transceiver continuously transmits and
receives MLT3 symbols. When not transmitting data, the LXT973 Transceiver generates
IDLE symbols.
During 10 Mbps operation, Manchester-encoded data is exchanged. When no data is
being exchanged, the line is left in an idle state. Link pulses are transmitted periodically to
keep the link up.
The LXT973 Transceiver supports either 100BASE-TX or 10BASE-T connections over
100Ω, Category 5, Unshielded Twisted-Pair (UTP) cable. Only a transformer, RJ-45
connector, and bypass capacitors are required to complete this interface. On the transmit
side, the waveshaping technology shapes the outgoing signal to help reduce the need for
external EMI filters. Four slew rate settings (refer to
designer to match the output waveform to the magnetic characteristics.
Fiber Interface
The LXT973 Transceiver fiber port is designed to interface with common industry-
standard fiber modules. It incorporates a PECL interface that complies with the ANSI
X3.166 standard for seamless integration.
Fiber mode is selected by putting a low level on the Fiber_TPn pin. This is only sensed
upon completion of reset.
Fault Detection and Reporting
The LXT973 Transceiver supports two fault detection and reporting mechanisms.
“Remote Fault” refers to a MAC-to-MAC communication function that is essentially
transparent to PHY layer devices, and is used only during auto-negotiation. Therefore,
Remote Fault is applicable only to twisted-pair links. "Far End Fault" is an optional PMA-
layer function that may be embedded within PHY devices. The LXT973 Transceiver
supports both functions, which are explained in more detail in sections that follow.
Remote Fault
Register bit 4.13 in the Auto-Negotiation Advertisement Register is reserved for Remote
Fault indications. This bit is typically used when restarting the auto-negotiation sequence,
indicating to the link partner that link is down because the advertising device detected a
fault.
When the LXT973 Transceiver receives a Remote Fault indication from its partner during
auto-negotiation it:
®
• Sets Register bit 5.13 in the Link Partner Base Page Ability Register, and
• Sets the Remote Fault Register bit 1.4 in the MII Status Register to pass this
LXT973 10/100 Mbps Dual-Port Fast Ethernet PHY Transceiver
information to the local controller.
Table 5 on page
3.7 Network Media/Protocol
20) allow the
Support
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