DP83849IFVSSLASHNOPB datasheet(92/108 Pages) TI2

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DP83849IF

SNOSAX8D – JUNE 2009 – REVISED APRIL 2013

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10.2.10

Energy Detect Control (EDCR)

This register provides control and status for the Energy Detect function.

Table 10-25. Energy Detect Control (EDCR), address 1Dh

Bit

Bit Name

Default

Description

ED_EN

Strap, RW

Energy Detect Enable:

Allow Energy Detect Mode.

When Energy Detect is enabled and Auto-Negotiation is disabled via the

BMCR register, Auto-MDIX should be disabled via the PHYCR register.

ED_AUTO_UP

1, RW

Energy Detect Automatic Power Up:

Automatically begin power up sequence when Energy Detect Data

Threshold value (EDCR[3:0]) is reached. Alternatively, device could be

powered up manually using the ED_MAN bit (ECDR[12]).

ED_AUTO_DOWN

1, RW

Energy Detect Automatic Power Down:

Automatically begin power down sequence when no energy is detected.

Alternatively, device could be powered down using the ED_MAN bit

(EDCR[12]).

ED_MAN

0, RW/SC

Energy Detect Manual Power Up/Down:

Begin power up/down sequence when this bit is asserted. When set, the

Energy Detect algorithm will initiate a change of Energy Detect state

regardless of threshold (error or data) and timer values. In managed

applications, this bit can be set after clearing the Energy Detect interrupt

to control the timing of changing the power state.

ED_BURST_DIS

0, RW

Energy Detect Burst Disable:

Disable bursting of energy detect data pulses. By default, Energy Detect

(ED) transmits a burst of 4 ED data pulses each time the CD is powered

up. When bursting is disabled, only a single ED data pulse will be send

each time the CD is powered up.

ED_PWR_STATE

0, RO

Energy Detect Power State:

Indicates current Energy Detect Power state. When set, Energy Detect is

in the powered up state. When cleared, Energy Detect is in the powered

down state. This bit is invalid when Energy Detect is not enabled.

ED_ERR_MET

0, RO/COR

Energy Detect Error Threshold Met:

No action is automatically taken upon receipt of error events. This bit is

informational only and would be cleared on a read.

ED_DATA_MET

0, RO/COR

Energy Detect Data Threshold Met:

The number of data events that occurred met or surpassed the Energy

Detect Data Threshold. This bit is cleared on a read.

7:4

ED_ERR_COUNT

0001, RW

Energy Detect Error Threshold:

Threshold to determine the number of energy detect error events that

should cause the device to take action. Intended to allow averaging of

noise that may be on the line. Counter will reset after approximately 2

seconds without any energy detect data events.

3:0

ED_DATA_COUNT

0001, RW

Energy Detect Data Threshold:

Threshold to determine the number of energy detect events that should

cause the device to take actions. Intended to allow averaging of noise

that may be on the line. Counter will reset after approximately 2 seconds

without any energy detect data events.

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