EELXT905PC.C2 查看數據表（PDF） - Intel

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EELXT905PC.C2

Universal 10BASE-T Transceiver with 3.3V Support

Intel 

Universal 10BASE-T Transceiver with 3.3V Support — LXT905

2.2

Controller Compatibility Modes

The LXT905 is compatible with most industry standard controllers, including devices produced by

Advanced Micro Devices (AMD), Intel, Fujitsu, National Semiconductor, Seeq, Motorola, and

Texas Instruments. Four different control signal timing and polarity schemes (Modes 1 through 4)

are required to achieve this compatibility. Mode select pins MD0 and MD1 determine controller

compatibility modes as listed in Table 2. Refer to the Test Specifications section for timing

diagrams and parameters.

2.3

Transmit Function

The LXT905 receives NRZ data from the controller at the TXD input, as shown in the block

diagram, and passes it through a Manchester encoder. The encoded data is then transferred 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 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 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 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)

Mode 2 - For Intel 82596 or compatible controllers1

Mode 3 - For Fujitsu MB86950, MB86960 or compatible controllers (Seeq 8005)2

Low

Low

High

Low

High

Low

Mode 4 - For TI TMS380C26 or compatible controllers

High

High

1. Refer to Intel Application Note 51 (MAC Interface Design Guide for Intel Controllers) when designing with

Intel controllers.

2. SEEQ controllers require inverters on CLKI, LBK, RCLK and COL.

Datasheet

11

Document #: 249271

Revision #: 002

Rev. Date: June 19, 2001

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