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| 型号： | WJLXT908LE.A4 |
| 厂商： | INTEL CORP |
| 元件分类： | 网络接口 |
| 英文描述： | DATACOM, ETHERNET TRANSCEIVER, PQFP64 |
| 封装： | ROHS COMPLIANT, LQFP-64 |
| 文件页数： | 7/46页 |
| 文件大小： | 618K |
| 代理商： | WJLXT908LE.A4 |
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Intel
LXT908 Universal 3.3 V 10BASE-T and AUI Transceiver
Datasheet
15
Document #: 249049
Revision #: 003
Rev. Date: 29-Oct-2005
network when SQE is enabled, the Intel
LXT908 Universal 3.3 V 10BASE-T and AUI
Transceiver transmits the SQE signal for 10BT ± 5BT over the internal CI circuit, which is
indicated on the COL pin of the device. SQE must be disabled for normal operation in hub and
switch applications. In twisted-pair applications, the SQE function is disabled when DSQE is set
High, and enabled when DSQE is Low. When using the 10BASE-2 port of the Intel LXT908
Universal 3.3 V 10BASE-T and AUI Transceiver, the SQE function is determined by the external
MAU attached.
2.1.6
Polarity Reverse Function
The Intel
LXT908 Universal 3.3 V 10BASE-T and AUI Transceiver polarity reverse function
uses both link pulses and end-of-frame data to determine polarity of the received signal. A reversed
polarity condition is detected when eight opposite receive link pulses are detected without receipt
of a link pulse of the expected polarity. Reversed polarity is also detected if four frames are
received with a reversed start-of-idle. Whenever a correct polarity frame or a correct link pulse is
received, these two counters are reset to zero. If the Intel
LXT908 Universal 3.3 V 10BASE-T
and AUI Transceiver enters the link fail state and no valid data or link pulses are received within 96
to 128 ms, the polarity is reset to the default non-flipped condition. If Link Integrity Testing is
disabled, polarity detection is based only on received data. Polarity correction is always enabled.
2.1.7
Loopback Function
The Intel LXT908 Universal 3.3 V 10BASE-T and AUI Transceiver provides the normal
loopback function specified by the 10BASE-T standard for the twisted-pair port. The loopback
function operates in conjunction with the transmit function. Data transmitted by the back-end is
internally looped back within the
Figure 5. SQE Function
Output Idle
Output Detected
Power On
DO=Active
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
SQE_Test_Timer_Done
XMIT=Disable
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