DJLXT905LE.C2 Cortina Systems Inc, DJLXT905LE.C2 Datasheet - Page 12

• Manufacturer Part Number: DJLXT905LE.C2
• Manufacturer: Cortina Systems Inc

Specifications of DJLXT905LE.C2

• Number Of Receivers: 1
• Data Rate: 10Mbps
• Protocols Supported: 10BASE-T
• Operating Supply Voltage (typ): 5V
• Package Type: LQFP
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (max): 5.25V
• Mounting: Surface Mount
• Pin Count: 32
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Lead Free Status / RoHS Status: Not Compliant

LXT905 Transceiver
Datasheet
249271, Revision 5.1
5 November 2007
Figure 5
2.6
2.7
Cortina Systems
SQE Function
Receive Function
The LXT905 Transceiver receive function acquires timing and data from the twisted-pair
network (TPI circuit). The LXT905 Transceiver 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 Transceiver receive function enters the
idle state. The LXT905 Transceiver automatically corrects reversed polarity on the TPI
circuit.
Polarity Reverse Function
The LXT905 Transceiver polarity reverse function uses both link pulses and end-of-frame
data to determine the polarity of the received signal.
®
• If you disable Link Integrity testing, polarity detection is based only on received data.
LXT905 Universal 10BASE-T Transceiver with 3.3 V Support
SQE_Test_Timer_Done
XMIT=Disable
A reversed polarity condition exits if the LXT905 Transceiver detects eight
consecutive opposite receive link pulses, without receiving a link pulse of the
expected polarity.
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
2.6 Receive Function
Page 12