LXT908KCA4QE000 データシートの表示（PDF） - Intel

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LXT908KCA4QE000

Universal 3.3V 10BASE-T and AUI Transceiver

Intel 

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

2.1.9

Link Pulse Transmission

The LXT908 transmits standard link pulses which meet the 10BASE-T specifications. Figure 7

shows the link integrity pulse timing.

Figure 7. Transmitted Link Integrity Pulse Timing

10-20 ms

10-20 ms 10-20 ms 10-20 ms

10-20 ms 10-20 ms 10-20 ms

10-20 ms 10-20 ms

2.1.10

Link Integrity Test Function

Figure 8 on page 17 is a state diagram of the LXT908 Link Integrity test function. The link

integrity test is used to determine the status of the receive side twisted-pair cable. Link integrity

testing is enabled when pin 8 (LI) is tied High. When enabled, the receiver recognizes link integrity

pulses which are transmitted in the absence of receive traffic.

If no serial data stream or link integrity pulses are detected within 50 - 150 ms, the chip enters a

link fail state and disables the transmit and normal loopback functions. The LXT908 ignores any

link integrity pulse with interval less than 2 - 7 ms. The LXT908 will remain in the link fail state

until it detects either a serial data packet or two or more link integrity pulses.

16

Datasheet

Document #: 249049

Revision #: 002

Rev. Date: June 19, 2001

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