参数资料
型号: WJLXT908LC.A4
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: 5/46页
文件大小: 618K
代理商: WJLXT908LC.A4
Intel
LXT908 Universal 3.3 V 10BASE-T and AUI Transceiver
Datasheet
13
Document #: 249049
Revision #: 003
Rev. Date: 29-Oct-2005
output is pre-distorted and pre-filtered to meet the 10BASE-T jitter template. An internal
continuous resistor-capacitor filter is used to remove any high-frequency clocking noise from the
pulse shaping circuitry. Integrated filters simplify the design work required for FCC-compliant
EMI performance. During idle periods, the Intel
LXT908 Universal 3.3 V 10BASE-T and AUI
Transceiver transmits link integrity test pulses on the TPO circuit (if LI is enabled and integrated
PLS/ MAU mode is selected). External resistors control the termination impedance.
2.1.3
Jabber Control Function
Figure 4 on page 14 is a state diagram of the Intel LXT908 Universal 3.3 V 10BASE-T and AUI
Transceiver Jabber control function. The Intel
LXT908 Universal 3.3 V 10BASE-T and AUI
Transceiver on-chip Watch-Dog Timer prevents the DTE from locking into a continuous transmit
mode. When a transmission exceeds the time limit, the Watch-Dog Timer disables the transmit and
loopback functions, and activates the JAB pin. Once the Intel
LXT908 Universal 3.3 V 10BASE-
T and AUI Transceiver is in the jabber state, the TXD circuit must remain idle for a period of 0.25
to 0.75 seconds before it will exit the jabber state.
Figure 3. TPO Output Waveform
Table 2.
Controller Compatibility Mode Options
Controller Mode
MD2
MD1
MD0
Mode 1 - For AMD AM7990, Motorola 68EN360, MPC860 or compatible
controllers
Low
Mode 2 - For Intel 82596 or compatible controllers
Low
High
Mode 3 - For Fujitsu MB86950, MB86960 or compatible controllers (Seeq
8005)
1
Low
High
Low
Mode 4 - For National Semiconductor 8390 or compatible controllers (TI
TMS380C26)
Low
High
Mode 5 - For custom controllers (Mode 3 with TCLK, RCLK and COL
inverted)
High
Low
1. SEEQ controllers require inverters on CLKI, LBK, RCLK, and COL in Mode 3; or on CLKI, LBK, and TCLK
in Mode 5.
4V
2V
0V
-2V
-4V
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