DJLXT905LC.C2 831645 Intel, DJLXT905LC.C2 831645 Datasheet - Page 13

• Manufacturer Part Number: DJLXT905LC.C2 831645
• Manufacturer: Intel

Specifications of DJLXT905LC.C2 831645

• Lead Free Status / RoHS Status: Not Compliant

2.5
2.6
Datasheet
Document Number: 249271
Revision Number: 004
Revision Date: 19-Oct-2005
Figure 5. SQE Function
SQE Function
The LXT905 supports the Signal Quality Error (SQE) function (see
successful transmission on the 10BASE-T network, the LXT905 transmits the SQE signal for
10 bit times (BT) ± 5BT on the COL pin of the device.
Receive Function
The LXT905 receive function acquires timing and data from the twisted-pair network (TPI circuit).
The LXT905 passes valid received signals through the on-chip filters and Manchester decoder,
then outputs them as decoded NRZ data on the RXD pin, and as receive timing on the RCLK pin.
An internal RC filter and an intelligent squelch function discriminate noise from link test pulses
and valid data streams. The receive function activates only when receiving valid data streams
above the squelch level with proper timing.
If the differential signal at the TPI circuit inputs falls below 85 percent of the threshold level
(unsquelched) for 8 bit times (typical), the LXT905 receive function enters the idle state. The
LXT905 automatically corrects reversed polarity on the TPI circuit.
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•
To disable the SQE function for repeater/switch applications, set DSQE High.
To enable the SQE function, set DSQE Low.
SQE_Test_Timer_Done
XMIT=Disable
LXT905 Universal 10BASE-T Transceiver with 3.3V Support
DSQE=1
Start_SQE_Test__Wait_Timer
Start_SQE_Test_Timer
Output Detected
SQE Wait Test
Output Idle
SQE Test
CI=SQE
SQE_Test__Wait_Timer_Done ∗
XMIT=Enable
DO=Active
DO=Idle ∗
DSQE=0
Power On
Figure
5). After every
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