VSC8658 datasheet(49/95 Pages) MICROSEMI

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Configuration

VMDS-10242 VSC8658 Datasheet Revision 4.1

The following information applies to the interrupt status bits:

•

All set bits in this register are cleared after being read (self-clearing). If bit 26.15 is set, the cause of

the interrupt can be read by reading bits 26.14:0.

•

For bits 26.14 and 26.12, bit 0.12 must be set for this interrupt to assert.

•

For bit 26.2, bits 4.8:5 must be set for this interrupt to assert.

5.2.22

MAC Interface Auto-Negotiation Control and Status

Device auto-negotiation for the MAC interface is controlled in register 27. The same register is used to

check the status of those parameters. The following table shows the settings available.

Table 31 •

MAC Auto-Negotiation Control and Status, Address 27 (0x1B)

Bit

Name

Access

Description

Default

MAC or media

interlock

R/W

This is a sticky bit.

1 = MAC interface disabled when media link

down.

0 = MAC interface not suppressed by media

link status.

MAC or media

restart

auto-negotiation

interlock

R/W

This is a sticky bit.

1 = MAC interface restarts its auto-negotiation

if the media link changes.

0 = MAC interface does not automatically

change if media link changes.

MAC interface

auto-negotiation

auto-sense

R/W

This is a sticky bit.

1 = If MAC auto-negotiation is enabled, this

allows the MAC interface to be able to link to

MACs with auto-negotiation enabled and

disabled.

0 = Normal MAC auto-negotiation behavior.

MAC interface

auto-negotiation

restart

R/W

This is a self-clearing bit.

1 = Restart auto-negotiation.

11:10

Reserved

9:8

Remote fault

detected from MAC

Corresponds to the remote fault bits sent by

the MAC during auto-negotiation.

Asymmetric pause

advertised by the

MAC

Corresponds to the asymmetric pause bit sent

by the MAC during auto-negotiation.

Symmetric pause

advertised by the

MAC

Corresponds to the symmetric pause bit sent

by the MAC during auto-negotiation.

Full-duplex

advertised by the

MAC

Corresponds to the full-duplex bit sent by the

MAC during auto-negotiation.

Half-duplex

advertised by the

MAC

Corresponds to the half-duplex bit sent by the

MAC during auto-negotiation.

3MAC

auto-negotiation

capable

1 = MAC is auto-negotiation capable.

MAC interface link

status

1 = The MAC interface is actively linked.

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