DP83822I datasheet(4/47 Pages) TI1

Part #	DP83822I

Description	Robust, Low Power 10/100 Mbps Ethernet Physical Layer Transceiver

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Manufacturer	TI1 [Texas Instruments]

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4

DP83822HF, DP83822IF, DP83822H, DP83822I

SNLS505 – JULY 2016

www.ti.com

Product Folder Links: DP83822HF DP83822IF DP83822H DP83822I

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Register Maps (continued)

Table 1. 0x0000 Basic Mode Control Register (BMCR) (continued)

BIT

NAME

TYPE

DEFAULT

FUNCTION

9

Restart Auto-Negotiation

RW, SC

0

Restart Auto-Negotiation:

1 = Restarts Auto-Negotiation

0 = Normal Operation

If Auto-Negotiation is disabled (bit[12] = 0), bit[9] is ignored. This bit is

self-clearing and will return a value of 1 until Auto-Negotiation is

initiated, whereupon it will self-clear. Operation of the Auto-

Negotiation process is not affected by the management entity

clearing this bit.

8

Duplex Mode

RW, Strap

1

Duplex Mode:

1 = Full-Duplex

0 = Half-Duplex

When Auto-Negotiation is disabled, writing to this bit allows the port

Duplex capability to be selected.

7

Collision Test

RW

0

Collision Test:

1 = Enable COL Signal Test

0 = Normal Operation

When set, this bit causes the COL signal to be asserted in response

to the assertion of TX_EN within 512 bit times. The COL signal is de-

asserted within 4 bit times in response to the de-assertion to TX_EN.

6:0

Reserved

RO

0

Reserved

Table 2. 0x0001 Basic Mode Status Register (BMCR)

BIT

NAME

TYPE

DEFAULT

FUNCTION

15

100Base-T4

RO

0

100Base-T4 Capable:

This protocol is not available. Always reads as 0.

14

100Base-TX Full-Duplex

RO

1

100Base-TX Full-Duplex Capable:

1 = Device able to perform Full-Duplex 100Base-TX

0 = Device not able to perform Full-Duplex 100Base-TX

13

100Base-TX Half-Duplex

RO

1

100Base-TX Half-Duplex Capable:

1 = Device able to perform Half-Duplex 100Base-TX

0 = Device not able to perform Half-Duplex 100Base-TX

12

10Base-T Full-Duplex

RO

1

10Base-T Full-Duplex Capable:

1 = Device able to perform Full-Duplex 10Base-T

0 = Device not able to perform Full-Duplex 10Base-T

11

10Base-T Half-Duplex

RO

1

10Base-T Half-Duplex Capable:

1 = Device able to perform Half-Duplex 10Base-T

0 = Device not able to perform Half-Duplex 10Base-T

10:7

Reserved

RO

0

Reserved

6

SMI Preamble Suppression

RO

1

Preamble Suppression Capable:

1 = Device able to perform SMI transaction with preamble

suppressed

0 = Device not able to perform SMI transaction with preamble

suppressed

If this bit is set to 1, 32-bits of preamble needed only once after reset,

invalid opcode or invalid turnaround.

5

Auto-Negotiation Complete

RO

0

Auto-Negotiation Complete:

1 = Auto-Negotiation process completed

0 = Auto Negotiation process not completed (either still in process,

disabled or reset)

4

Remote Fault

RO, LH

0

Remote Fault:

1 = Remote fault condition detected

0 = No remote fault condition detected

Far End Fault indication or notification from Link Partner of Remote

Fault. This bit is cleared on read or reset.

3

Auto-Negotiation Ability

RO

1

Auto-Negotiation Ability:

1 = Device is able to perform Auto-Negotiation

0 = Device is not able to perform Auto-Negotiation

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