参数资料
型号: WJLXT905LE.C2
厂商: CORTINA SYSTEMS INC
元件分类: 网络接口
英文描述: DATACOM, ETHERNET TRANSCEIVER, PQFP32
封装: ROHS COMPLIANT, MO-136BC, LQFP-32
文件页数: 5/40页
文件大小: 544K
代理商: WJLXT905LE.C2
LXT905 Universal 10BASE-T Transceiver with 3.3V Support
Datasheet
13
Document Number: 249271
Revision Number: 004
Revision Date: 19-Oct-2005
2.5
SQE Function
The LXT905 supports the Signal Quality Error (SQE) function (see Figure 5). After every
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.
To disable the SQE function for repeater/switch applications, set DSQE High.
To enable the SQE function, set DSQE Low.
2.6
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.
Figure 5. SQE Function
XMIT=Disable
SQE_Test_Timer_Done
DSQE=1
DO=Active
Output Idle
Output Detected
Power On
SQE Wait Test
Start_SQE_Test__Wait_Timer
SQE Test
Start_SQE_Test_Timer
CI=SQE
SQE_Test__Wait_Timer_Done
XMIT=Enable
DO=Idle
DSQE=0
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