DP83848JSQSLASHNOPB datasheet(52/84 Pages) TI1

52 / 84 page

DP83848H, DP83848J, DP83848K, DP83848M, DP83848T

SNLS250E – MAY 2008 – REVISED APRIL 2015

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Table 6-9. Basic Mode Control Register (BMCR), address 0x00 (continued)

Bit

Bit Name

Default

Description

Collision Test

0, RW

Collision Test:

1 = Collision test enabled.

0 = Normal operation.

When set, this bit will cause the COL signal to be asserted in response to the assertion of

TX_EN within 512-bit times. The COL signal will be deasserted within 4-bit times in response to

the deassertion of TX_EN.

6:0

RESERVED

0, RO

RESERVED: Write ignored, read as 0.

6.6.1.1.2 Basic Mode Status Register (BMSR)

Table 6-10. Basic Mode Status Register (BMSR), address 0x01

Bit

Bit Name

Default

Description

100BASE-T4

0, RO/P

100BASE-T4 Capable:

0 = Device not able to perform 100BASE-T4 mode.

100BASE-TX Full

1, RO/P

100BASE-TX Full Duplex Capable:

Duplex

1 = Device able to perform 100BASE-TX in full duplex mode.

100BASE-TX Half

1, RO/P

100BASE-TX Half Duplex Capable:

Duplex

1 = Device able to perform 100BASE-TX in half duplex mode.

10BASE-T Full

1, RO/P

10BASE-T Full Duplex Capable:

Duplex

1 = Device able to perform 10BASE-T in full duplex mode.

10BASE-T Half

1, RO/P

10BASE-T Half Duplex Capable:

Duplex

1 = Device able to perform 10BASE-T in half duplex mode.

10:7

RESERVED

0, RO

RESERVED: Write as 0, read as 0.

MF Preamble

1, RO/P

Preamble suppression Capable:

Suppression

1 = Device able to perform management transaction with preamble suppressed, 32-bits of

preamble needed only once after reset, invalid opcode or invalid turnaround.

0 = Normal management operation.

Auto-Negotiation

0, RO

Auto-Negotiation Complete:

Complete

1 = Auto-Negotiation process complete.

0 = Auto-Negotiation process not complete.

Remote Fault

0, RO/LH

Remote Fault:

1 = Remote Fault condition detected (cleared on read or by reset). Fault criteria: Notification from

Link Partner of Remote Fault.

0 = No remote fault condition detected.

Auto-Negotiation

1, RO/P

Auto Negotiation Ability:

Ability

1 = Device is able to perform Auto-Negotiation.

0 = Device is not able to perform Auto-Negotiation.

Link Status

0, RO/LL

Link Status:

1 = Valid link established (for either 10 or 100 Mb/s operation).

0 = Link not established.

The criteria for link validity is implementation specific. The occurrence of a link failure condition

will causes the Link Status bit to clear. Once cleared, this bit may only be set by establishing a

good link condition and a read through the management interface.

Jabber Detect

0, RO/LH

Jabber Detect: This bit only has meaning in 10 Mb/s mode.

1 = Jabber condition detected.

0 = No Jabber.

This bit is implemented with a latching function, such that the occurrence of a jabber condition

causes it to set until it is cleared by a read to this register by the management interface or by a

reset.

Extended

1, RO/P

Extended Capability:

Capability

1 = Extended register capabilities.

0 = Basic register set capabilities only.

Detailed Description

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