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| 型号： | WJLXT907ALCA4 |
| 厂商： | CORTINA SYSTEMS INC |
| 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： | 7/48页 |
| 文件大小： | 621K |
| 代理商： | WJLXT907ALCA4 |
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Intel
LXT901A/907A Universal 3.3 V Ethernet Transceiver
Datasheet
15
Document Number: 249098
Revision Number: 003
Revision Date: 27-Nov-2005
2.3
Receive Function
The LXT901A/907A Transceiver receive function acquires timing and data from the twisted-pair
network (the TPI circuit) or from the AUI (the DI 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 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
LXT901A/907A Transceiver receive function enters the idle state. If the polarity of the TPI circuit
is reversed, LXT901A/907A Transceiver detects the polarity reverse and reports it via the PLR
output. The LXT901A/907A Transceiver automatically corrects reversed polarity.
2.3.1
Polarity Reverse Function
The LXT901A/907A Transceiver polarity reverse function uses both link pulses and end-of-frame
data to determine the 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 LXT901A/907A Transceiver enters the link fail state and no valid data or link pulses
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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| WJLXT908LC.A4 | 功能描述:IC 3V 10BASE-T/AUI TXCVR 64LQFP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:1,000 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-SOIC（0.295"，7.50mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
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| WJLXT908LE.A4 | 功能描述:IC 3V 10BASE-T/AUI TXCVR 64-LQFP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:1,000 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-SOIC（0.295"，7.50mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
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