SLXT973QCA3V 856775 Intel, SLXT973QCA3V 856775 Datasheet - Page 34
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SLXT973QCA3V 856775
Manufacturer Part Number
SLXT973QCA3V 856775
Description
Manufacturer
Intel
Datasheet
1.SLXT973QCA3V_856775.pdf
(88 pages)
Specifications of SLXT973QCA3V 856775
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LXT973 10/100 Mbps Dual-Port Fast Ethernet PHY Transceiver
3.7.3
3.7.4
3.7.5
3.7.6
34
The LXT973 supports either 100BASE-TX or 10BASE-T connections over 100
Unshielded Twisted-Pair (UTP) cable. Only a transformer, RJ-45 connector, and bypass capacitors
are required to complete this interface. On the transmit side, Intel’s patented waveshaping
technology shapes the outgoing signal to help reduce the need for external EMI filters. Four slew
rate settings (refer to
magnetic characteristics.
Fiber Interface
The LXT973 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 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 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 receives a Remote Fault indication from its partner during auto-negotiation it:
Far End Fault
In fiber mode, the SDn pin monitors signal quality. If signal quality degrades beyond the fault
threshold, the fiber transceiver reports a signal quality fault condition via the SDn pin. Loss of
signal quality blocks any fiber data from being received and causes a loss of link.
•
•
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 information to the
local controller.
Table 5 on page
19) allow the designer to match the output waveform to the
Rev. Date: March 1, 2002
Document #: 249426
Category
Revision #: 002
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