SLXT973QE Cortina Systems Inc, SLXT973QE Datasheet - Page 40

• 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
3.9
Note:
3.9.1
3.9.2
3.9.3
3.9.4
3.9.5
Cortina Systems
10 Mbps Operation
The LXT973 Transceiver operates as a standard 10BASE-T transceiver and supports all
the standard 10 Mbps functions. During 10BASE-T operation, the LXT973 Transceiver
transmits and receives Manchester-encoded data across the network link. When the MAC
is not actively transmitting data, the device sends out link pulses on the line.
In 10BASE-T mode, the polynomial scrambler/de-scrambler is inactive. Manchester-
encoded signals received from the network are decoded by the LXT973 Transceiver and
sent across the MII to the MAC.
The LXT973 Transceiver does not support fiber connections at 10 Mbps.
Polarity Correction
The LXT973 Transceiver automatically detects and corrects for an inverted receive signal.
Reversed polarity is detected if eight inverted link pulses or four inverted End-of-Frame
(EOF) markers are received consecutively. If link pulses or data are not received by the
maximum receive time-out period, the polarity state is reset to a non-inverted state.
Dribble Bits
The LXT973 Transceiver device handles dribble bits in all modes. If one through four
dribble bits are received, the nibble is passed across the MII. If five through seven dribble
bits are received, the second nibble is not sent to the MII bus.
Link Test
The LXT973 Transceiver always transmits link pulses in 10BASE-T mode. When enabled,
the link test function monitors the connection for link pulses. Once link pulses are
detected, data transmission is enabled and remains enabled as long as either the link
pulses or data transmission continues. If link pulses stop, the data transmission is
disabled.
If the link test function is disabled, the LXT973 Transceiver transmits to the connection
regardless of detected link pulses. The link test function is disabled by setting Register bit
16.14 = 1.
Link Failure
Link failure occurs if Link Test is enabled and link pulses or packets stop being received. If
this condition occurs, the LXT973 Transceiver returns to the auto-negotiation phase if
auto-negotiation is enabled.
Jabber
If a transmission exceeds the jabber timer, the LXT973 Transceiver disables the transmit
and loopback functions. The LXT973 Transceiver automatically exits jabber mode after
the unjab time has expired. This function is disabled by setting Register bit 16.10 = 1.
®
LXT973 10/100 Mbps Dual-Port Fast Ethernet PHY Transceiver
3.9 10 Mbps Operation
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