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| 型号： | WJLXT905LE.C2 |
| 厂商： | CORTINA SYSTEMS INC |
| 元件分类： | 网络接口 |
| 英文描述： | DATACOM, ETHERNET TRANSCEIVER, PQFP32 |
| 封装： | ROHS COMPLIANT, MO-136BC, LQFP-32 |
| 文件页数： | 3/40页 |
| 文件大小： | 544K |
| 代理商： | WJLXT905LE.C2 |
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LXT905 Universal 10BASE-T Transceiver with 3.3V Support
Datasheet
11
Document Number: 249271
Revision Number: 004
Revision Date: 19-Oct-2005
2.2
Controller Compatibility Modes
The LXT905 is compatible with most industry standard controllers, including devices from
Advanced Micro Devices* (AMD), Fujitsu*, National Semiconductor*, Seeq*, Motorola*, and
Texas Instruments*. Four different control signal timing and polarity schemes (Modes 1 through 4)
provide this compatibility. The MD0 and MD1 mode select pins determine controller compatibility
modes (see Table 2). Refer to Section 4.0, “Test Specifications” on page 23 for timing diagrams
and parameters.
2.3
Transmit Function
The LXT905 receives NRZ data from the controller at the TXD input, as shown in Figure 1 “Block
Diagram” on page 6, and passes it through a Manchester encoder. The LXT905 then transfers
encoded data to the twisted-pair network (TPO circuit). The advanced integrated pulse shaping and
filtering network produces the output signal on TPON and TPOP, as shown in Figure 3 “TPO
Output Waveform” on page 10. The TPO output is pre-distorted and pre-filtered to meet the
10BASE-T jitter template. An internal, continuous resistor-capacitor filter removes 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 LXT905 transmits
link integrity test pulses on the TPO circuit (if LI is enabled and LBK is disabled).
Table 2.
Controller Compatibility Mode Options
Controller Mode
MD1
MD0
Mode 1 - For Motorola* MC68EN360 or compatible controllers (AMD* AM7990)
Low
Mode 2 - For Intel* 82596 or compatible controllers1
Low
High
Mode 3 - For Fujitsu* MB86950, MB86960 or compatible controllers (Seeq* 8005)2
High
Low
Mode 4 - For TI* TMS380C26 or compatible controllers
High
1. Refer to the MAC Interface Design Guide for Intel Controllers Application Note when designing with Intel
controllers.
2. SEEQ* controllers require inverters on CLKI, LBK, RCLK, and COL.
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