DP83848M datasheet(13/72 Pages) NSC

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1.7 10 MB/S AND 100 MB/S PMD INTERFACE

1.8 SPECIAL CONNECTIONS

1.9 POWER SUPPLY PINS

LED_CFG (CRS)

S, O, PU

LED CONFIGURATION: This strapping option determines the

mode of operation of the LED pins. Default is Mode 1. Mode 1 and

Mode 2 can be controlled via the strap option. All modes are con-

figurable via register access.

SeeTable 4 for LED Mode Selection.

MDIX_EN (RX_ER)

S, O, PU

MDIX ENABLE: Default is to enable MDIX. This strapping option

disables Auto-MDIX. An external pull-down will disable Auto-

MDIX mode.

Signal Name

Type

Pin #

Description

TD-, TD+

I/O

14, 15

Differential common driver transmit output (PMD Output Pair).

These differential outputs are automatically configured to either

10BASE-T or 100BASE-TX signaling.

In Auto-MDIX mode of operation, this pair can be used as the Re-

ceive Input pair.

These pins require 3.3V bias for operation.

RD-, RD+

I/O

11, 12

Differential receive input (PMD Input Pair). These differential in-

puts are automatically configured to accept either 100BASE-TX

or 10BASE-T signaling.

In Auto-MDIX mode of operation, this pair can be used as the

Transmit Output pair.

These pins require 3.3V bias for operation.

Signal Name

Type

Pin #

Description

RBIAS

Bias Resistor Connection. A 4.87 k

Ω 1% resistor should be con-

nected from RBIAS to GND.

PFBOUT

Power Feedback Output. Parallel caps, 10

µ F (Tantalum pre-

ferred) and 0.1

µF, should be placed close to the PFBOUT. Con-

nect this pin to PFBIN1 (pin 16) and PFBIN2 (pin 30). See

Section 5.4 for proper placement pin.

PFBIN1

PFBIN2

I16

Power Feedback Input. These pins are fed with power from

PFBOUT pin. A small capacitor of 0.1

µF should be connected

close to each pin.

Note: Do not supply power to these pins other than from

PFBOUT.

RESERVED

I/O

8,9,10

RESERVED: These pins must be left unconnected.

Signal Name

Pin #

Description

IOVDD33

1, 26

I/O 3.3V Supply

IOGND

I/O Ground

DGND

Digital Ground

AVDD33

Analog 3.3V Supply

AGND

13, 17

Analog Ground

Signal Name

Type

Pin #

Description

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