LXT908KCA4SE000 データシートの表示（PDF） - Intel

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LXT908KCA4SE000

Universal 3.3V 10BASE-T and AUI Transceiver

Intel 

Universal 3.3V 10BASE-T and AUI Transceiver — LXT908

Figure 4. Jabber Control Function

Power On

No Output

DO=Active

Nonjabber Output

Start_XMIT_MAX_Timer

DO=Idle

DO=Active ∗

XMIT_Max_Timer_Done

Jab

XMIT=Disable

LPBK=Disable

CI=SQE

DO=Idle

Unjab Wait

Start_Unjab_Timer

XMIT=Disable

LPBK=Disable

CI=SQE

Unjab_ Timer_Done DO=Active ∗

Unjab_Timer_Not_Done

2.1.4

2.1.5

Receive Function

The LXT908 receive function acquires timing and data from the twisted-pair network (TPI circuit)

or from the AUI (DI circuit). Valid received signals are passed through the on-chip filters and

Manchester decoder then output as decoded NRZ data and recovered clock 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 LXT908

receive function enters the idle state. If the polarity of the TPI circuit is reversed, LXT908 detects

the polarity reverse and reports it via the PLR output. The LXT908 automatically corrects reversed

polarity.

SQE Function

In the integrated PLS/MAU mode, the LXT908 supports the signal quality error (SQE) function as

shown in Figure 5 on page 14, although the SQE function can be disabled. After every successful

transmission on the 10BASE-T network when SQE is enabled, the LXT908 transmits the SQE

signal for 10BT ± 5BT over the internal CI circuit, which is indicated on the COL pin of the device.

Datasheet

13

Document #: 249049

Revision #: 002

Rev. Date: June 19, 2001

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