DP83849CVSSLASHNOPB datasheet(15/101 Pages) TI1

15 / 101 page

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1.7 10 Mb/s and 100 Mb/s PMD Interface

LED_CFG_A

(CRS_A/CRS_DV_A)

LED_CFG_B

(CRS_B/CRS_DV_B)

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.

See Table 3 on page 20 for LED Mode Selection.

MDIX_EN_A (RX_ER_A)

MDIX_EN_B (RX_ER_B)

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.

ED_EN_A (RXD3_A)

ED_EN_B (RXD3_B)

S, O, PD

Energy Detect ENABLE: Default is to disable Energy Detect

mode. This strapping option enables Energy Detect mode for the

port. In Energy Detect mode, the device will initially be in a low-

power state until detecting activity on the wire. An external pull-up

will enable Energy Detect mode.

CLK2MAC_DIS (RXD2_A)

S, O, PD

Clock to MAC Disable: This strapping option disables (floats) the

CLK2MAC pin. Default is to enable CLK2MAC output. An external

pullup will disable (float) the CLK2MAC pin. If the system does not

require the CLK2MAC signal, the CLK2MAC output should be dis-

abled via this strap option.

Signal Name

Type

Pin #

Description

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.

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