LAN9250 datasheet(19/421 Pages) MICROCHIP

19 / 421 page

 2015 Microchip Technology Inc.

DS00001913A-page 19

LAN9250

Note 1:

In copper mode, either channel 1 or 2 may function as the transmit pair while the other channel functions as

the receive pair. The pin name symbols for the twisted pair pins apply to a normal connection. If HP Auto-

MDIX is enabled and a reverse connection is detected or manually selected, the RX and TX pins will be

swapped internally.

Note 2:

Configuration strap pins are identified by an underlined symbol name. Configuration strap values are

latched on power-on reset or RST# de-assertion. Refer to Section 7.0, "Configuration Straps," on page 54

for more information.

Note 3:

Refer to Section 4.0, "Power Connections," on page 26, the device reference schematics, and the device

LANCheck schematic checklist for additional connection information.

Transmitter

+1.2 V Power

Supply

VDD12TX1

This pin is supplied from either an external 1.2 V

supply or from the device’s internal regulator via the

PCB. This pin must be tied to the VDD12TX2 pin for

proper operation.

See Note 3.

Transmitter

+1.2 V Power

Supply

VDD12TX2

This pin is supplied from either an external 1.2 V

supply or from the device’s internal regulator via the

PCB. This pin must be tied to the VDD12TX1 pin for

proper operation.

See Note 3.

TABLE 3-4:

HOST BUS PIN DESCRIPTIONS

Num

Pins

Name

Symbol

Buffer

Type

Description

Read

VIS

This pin is the host bus read strobe.

Normally active low, the polarity can be changed via

the HBI_rd_rdwr_polarity_strap.

Read or Write

RD_WR

VIS

This pin is the host bus direction control. Used in

conjunction with the ENB pin, it indicates a read or

write operation.

The normal polarity is read when 1, write when 0 (R/

nW) but can be changed via the HBI_rd_rdwr_polar-

ity_strap.

Write

VIS

This pin is the host bus write strobe.

Normally active low, the polarity can be changed via

the HBI_wr_en_polarity_strap.

Enable

ENB

VIS

This pin is the host bus data enable strobe. Used in

conjunction with the RD_WR pin it indicates the

data phase of the operation.

Normally active low, the polarity can be changed via

the HBI_wr_en_polarity_strap.

TABLE 3-3:

LAN PIN DESCRIPTIONS (CONTINUED)

Num

Pins

Name

Symbol

Buffer

Type

Description

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