LXT908KCA4S データシートの表示（PDF） - Intel

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LXT908KCA4S

Universal 3.3V 10BASE-T and AUI Transceiver

Intel 

LXT908 — Universal 3.3V 10BASE-T and AUI Transceiver

3.0

Application Information

Figure 9 on page 19 through Figure 15 on page 25 show typical LXT908 applications.

3.1

External Components

3.1.1

Crystal Information

Suitable crystals are available from various manufacturers. Table 3 lists suitable crystals based on a

limited evaluation. Designers should test and validate all crystals before using them in production.

Table 3. Suitable Crystals

Manufacturer

MTRON

Part Number

MP-1

MP-2

3.1.2

Magnetic Information

The twisted-pair interface requires a 1:1 ratio for the receive transformer, and a 1:2 ratio for the

transmit transformer. The AUI interface requires a 1:1 ratio for data-in, data-out, and collision-pair

transformers. A cross-reference list of suitable magnetics and part numbers is available in

Application Note 73, Magnetic Manufacturers (248991-001), that can be found on the Intel website

(www.intel.com). Designers should test and validate all magnetics before committing to a specific

component.

3.2

3.2.1

Layout Requirements

Auto Port Select with External Loopback Control

Figure 9 on page 19 is a typical LXT908 application. The diagram groups similar pins together, but

does not represent the actual LXT908 pin-out. The controller interface pins (TXD, RXD, TEN,

TCLK, RCLK, CD, COL, and LBK) are shown at the top left of the diagram.

Programmable option pins are grouped at the center left of the diagram. The PAUI pin is tied Low

and all other option pins are tied High. This setup selects the following options:

• Automatic Port Selection

(PAUI Low and AUTOSEL High)

• Normal Receive Threshold (NTH High)

• Mode 4, compatible with National NS8390 controllers (MD2:0 = Low, High, High)

• SQE Disabled (DSQE High)

• Link Testing Enabled (LI High)

18

Datasheet

Document #: 249049

Revision #: 002

Rev. Date: June 19, 2001

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