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DP83620

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SNLS339C – JANUARY 2011 – REVISED APRIL 2013

Table 10-3. Basic Mode Control Register (BMCR), address 0x00 (continued)

Bit

Bit Name

Default

Description

RESTART

0, RW/SC

Restart Auto-Negotiation:

AUTO-NEGOTIATION

1 = Restart Auto-Negotiation. Re-initiates the Auto-Negotiation process. If Auto-

Negotiation is disabled (bit 12 = 0), this bit 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.

0 = Normal operation.

DUPLEX MODE

Strap, RW

Duplex Mode:

When auto-negotiation is disabled writing to this bit allows the port Duplex capability to

be selected.

1 = Full Duplex operation.

0 = Half Duplex operation.

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 de-asserted within 4-bit times in

response to the de-assertion of TX_EN.

RESERVED

0, RO

RESERVED: Write ignored, read as 0.

UNIDIRECTIONAL

0, RW

Unidirectional Enable:

ENABLE

1 = Allow 100 Mb transmit activity independent of link status.

0 = Require link up for 100 Mb/s transmit activity.

This bit has no effect in 10 Mb/s mode.

4:0

RESERVED

0 0000, RO

RESERVED: Write ignored, read as 0.

10.1.2 Basic Mode Status Register (BMSR)

Table 10-4. 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

1, RO/P

100BASE-TX Full Duplex Capable:

FULL DUPLEX

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

100BASE-TX 0

1, RO/P

100BASE-TX Half Duplex Capable:

HALF DUPLEX

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

10BASE-T

1, RO/P

10BASE-T Full Duplex Capable:

FULL DUPLEX

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

10BASE-T

1, RO/P

10BASE-T Half Duplex Capable:

HALF DUPLEX

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

10:8

RESERVED

000, RO

RESERVED: Write as 0, read as 0.

UNIDIRECTIONAL

1, RO/P

Unidirectional Ability:

ABILITY

1 = Device able to transmit in 100 Mb/s mode independent of link status.

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.

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