EELXT905PC.C2 데이터 시트보기 (PDF) - Intel

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EELXT905PC.C2

Universal 10BASE-T Transceiver with 3.3V Support

Intel 

Universal 10BASE-T Transceiver with 3.3V Support — LXT905

2.5

SQE Function

The LXT905 supports the Signal Quality Error (SQE) function as shown in 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.

The SQE can be disabled for repeater/switch applications. When DSQE is set High, the SQE

function is disabled. When DSQE is Low, the SQE function is enabled.

Figure 5. SQE Function

Power On

Output Idle

DO=Active

Output Detected

DSQE=1

DO=Idle ∗

DSQE=0

SQE Wait Test

Start_SQE_Test__Wait_Timer

XMIT=Disable

SQE_Test__Wait_Timer_Done ∗

XMIT=Enable

SQE Test

Start_SQE_Test_Timer

CI=SQE

SQE_Test_Timer_Done

2.6

Receive Function

The LXT905 receive function acquires timing and data from the twisted-pair network (TPI 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 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.

Datasheet

13

Document #: 249271

Revision #: 002

Rev. Date: June 19, 2001

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