DP83849I datasheet(16/106 Pages) NSC

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1.8 10 Mb/s and 100 Mb/s PMD Interface

1.9 Special Connections

1.10 Power Supply Pins

Signal Name

Type

Pin #

Description

TPTDM_A

TPTDP_A

TPTDM_B

TPTDP_B

I/O

10BASE-T or 100BASE-TX Transmit Data

In 10BASE-T or 100BASE-TX: Differential common driver trans-

mit output (PMD Output Pair). These differential outputs are auto-

matically 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.

TPRDM_A

TPRDP_A

TPRDM_B

TPRDP_B

I/O

10BASE-T or 100BASE-TX Receive Data

In 10BASE-T or 100BASE-TX: Differential receive input (PMD In-

put Pair). These differential inputs 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 and 0.1µF, should

be placed close to the PFBOUT. Connect this pin to PFBIN1 (pin

13), PFBIN2 (pin 27), PFBIN3 (pin35), PFBIN4 (pin 49). See

Section 5.4 for proper placement pin.

PFBIN1

PFBIN2

PFBIN3

PFBIN4

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.

Signal Name

Pin #

Description

IOVDD1, IOVDD2, IOVDD3,

IOVDD4

11,51,65,78

I/O 3.3V Supply

IOGND1, IOGND2,

IOGND3, IOGND4

10,52,64,77

I/O Ground

COREGND1, COREGND2

6,55

Core Ground

CDGND1, CDGND2

25,37

CD Ground

ANA33VDD

Analog 3.3V Supply

ANAGND1, ANAGND2,

ANAGND3, ANAGND4

22,29,33,40

Analog Ground

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