SLXT973QC Cortina Systems Inc, SLXT973QC Datasheet - Page 38

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SLXT973QC

Manufacturer Part Number
SLXT973QC
Description
Manufacturer
Cortina Systems Inc
Datasheet

Specifications of SLXT973QC

Lead Free Status / Rohs Status
Not Compliant

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LXT973 Transceiver
Datasheet
249426, Revision 6.0
13 July 2007
Figure 10
3.8.4
3.8.4.1
Note:
3.8.4.2
3.8.4.3
Cortina Systems
Protocol Sublayers
PMA Sublayer
Link Failure Override
The LXT973 Transceiver normally transmits 100 Mbps data packets or IDLE symbols only
if it detects that link is up, and transmits FLP bursts in auto-negotiation mode or IDLE
symbols in forced mode. Setting Register bit 16.14 = 1 overrides this function, allowing the
LXT973 Transceiver to transmit data packets even when link is down. This feature is
provided as a diagnostic tool.
Auto-negotiation must be disabled to transmit data packets in the absence of link. If auto-
negotiation is enabled, the LXT973 Transceiver automatically begins transmitting FLP
bursts if the link goes down.
Carrier Sense
For 100BASE-TX and 100BASE-FX links, a Start-of-Stream Delimiter (SSD) or /J/K/
symbol pair causes assertion of carrier sense (CRS). An End-of-Stream Delimiter (ESD),
or /T/R/ symbol pair causes de-assertion of CRS. The PMA layer also de-asserts CRS if
IDLE symbols are received without /T/R/. In this event, the RXER bit in the RX Status
Frame is asserted for one clock cycle when CRS is de-asserted.
Twisted-Pair PMD Sublayer
The twisted-pair Physical Medium Dependent (PMD) layer provides the signal scrambling
and descrambling, line coding and decoding (MLT-3), as well as receiving, polarity
correction, and baseline wander correction functions.
®
LXT973 10/100 Mbps Dual-Port Fast Ethernet PHY Transceiver
Sublayer
Sublayer
Sublayer
PMA
PMD
PCS
LXT973
De-scrambler
Scrambler/
Serializer/De-serializer
100BASE-TX
Link/Carrier Detect
Encoder/Decoder
MII Interface
Fiber Transceiver
LVPECL Interface
100BASE-FX
3.8 100 Mbps Operation
Page 38

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