WJLXT901ALC.A4 Cortina Systems Inc, WJLXT901ALC.A4 Datasheet - Page 14

• Manufacturer Part Number: WJLXT901ALC.A4
• Manufacturer: Cortina Systems Inc

Specifications of WJLXT901ALC.A4

• Lead Free Status / RoHS Status: Compliant

LXT901/907 — Universal 10BASE-T and AUI Transceivers
2.2.2.1
2.3
14
Figure 5. SQE Function
SQE Disable Function (LXT907 only)
SQE must be disabled for normal operation in hub and switch applications. The LXT907 offers an
SQE disable function. The SQE function is disabled when DSQE is set High, and enabled when
DSQE is Low.
Receive Function
The LXT901/907 receive function acquires timing and data from the twisted-pair network (the TPI
circuit) or from the AUI (the DI circuit). Valid received signals are passed through the on-chip
filters and Manchester decoder, then output as decoded NRZ data and receive timing on the RXD
and RCLK pins, respectively.
An internal RC filter and an intelligent squelch function discriminate noise from link test pulses
and valid data streams. The receive function is activated only by valid data streams above the
squelch level and with proper timing. If the differential signal at the TPI or the DI circuit inputs
falls below 75 percent of the threshold level (unsquelched) for 8 bit times (typical), the LXT901/
907 receive function enters the Idle state. If the polarity of the TPI circuit is reversed, LXT901/
907 detects the polarity reverse and reports it via the PLR output. The LXT901/907 automatically
corrects reversed polarity.
SQE_Test_Timer_Done
XMIT=Disable
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=Idle
DO=Active
Power On
Rev. Date: June 19, 2001
Document #: 249097
Revision #: 002
Datasheet