LAN9354 datasheet(101/487 Pages) MICROCHIP

101 / 487 page

 2015 Microchip Technology Inc.

DS00001926B-page 101

LAN9354

If Loss of Signal mode is not selected, then Signal Detect mode is selected, independently, by the FXSDENA or FXS-

DENB strap input pin. When greater than 1 V (typ.), Signal Detect mode is enabled, when less than 1 V (typ.), copper

twisted pair is enabled.

Table 9-10 and Table 9-11 summarize the selections.

9.2.18

REQUIRED ETHERNET MAGNETICS (100BASE-TX AND 10BASE-T)

The magnetics selected for use with the device should be an Auto-MDIX style magnetic, which is widely available from

several vendors. Please review the SMSC/Microchip Application note 8.13 “Suggested Magnetics” for the latest quali-

fied and suggested magnetics. A list of vendors and part numbers are provided within the application note.

9.2.19

EXTERNAL PIN ACCESS TIMING REQUIREMENTS

When accessed externally via the MDIO / MDC pins, the following timing applies.

Note:

The FXSDENA strap input pin is shared with the FXSDA pin and the FXSDENB strap input pin is shared

with the FXSDB pin. As such, the LVPECL levels ensure that the input is greater than 1 V (typ.) and that

Signal Detect mode is selected. When TP copper is desired, the Signal Detect input function is not required

and the pin should be set to 0 V.

Care must be taken such that an non-powered or disabled transceiver does not load the Signal Detect input

below the valid LVPECL level.

TABLE 9-10:

100BASE-FX LOS, SD AND TP COPPER SELECTION PHY A

FXLOSEN

FXSDENA

PHY Mode

<1 V (typ.)

TP copper

>1 V (typ.)

100BASE-FX Signal Detect

>1 V (typ.)

n/a

100BASE-FX LOS

TABLE 9-11:

100BASE-FX LOS, SD AND TP COPPER SELECTION PHY B

FXLOSEN

FXSDENB

PHY Mode

<1 V (typ.)

TP copper

>1 V (typ.)

100BASE-FX Signal Detect

>2 V (typ.)

n/a

100BASE-FX LOS

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