VSC8221 datasheet(73/138 Pages) MICROSEMI

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VSC8221

Data Sheet

VMDS-10106 Revision 4.1

December 2006

73 of 106

106

5.14 – LP Acknowledge

Bit 5.14 returns a “1” when the Link Partner signals that it has successfully received the Link Code Word from the local PHY. The

local PHY uses this bit for proper Link Code Word exchange, as defined in Clause 28 of iEEE 802.3.

5.13 – LP Remote Fault

Bit 5.13 returns a “1” when the Link Partner signals that a remote fault (from its perspective) has occurred. The local PHY does

not otherwise use this bit. Note that iEEE Clause-37 provides for two remote fault bits, while Clause-28 provides only a single

remote fault bit. This difference is handled in Extended Mii register bits 16E.2:1 - Remote Fault Mapping Mask and 16E.0 -

Remote Fault Mapping OR. The state of this bit is valid when the Auto-Negotiation Complete bit (1.5) is set.

5.12 – Reserved

5.11 – LP Asymmetric Pause Capability

The LP Asymmetric Pause Capability bit indicates whether the Link Partner has asymmetric pause capability. The state of this

bit is valid when the Auto-Negotiation Complete bit (1.5) is set.

5.10 – LP Symmetric Pause Capability

The LP Symmetric Pause Capability bit indicates whether the Link Partner supports symmetric pause frame capability. This bit

is used by the Link Partner’s MAC to communicate symmetric pause capability to the local MAC. it has no effect on PHY

operation. The state of this bit is valid when the Auto-Negotiation Complete bit (1.5) is set.

5.9:5 – LP Advertise Capability

Bits 5.9:5 reflect the abilities of the Link Partner. A “1” on any of these bits indicates that the Link Partner advertises capability of

performing the corresponding mode of operation. These bits are not available for read in Clause-37 view, but remain valid for

CAT-5 copper media and can be viewed by switching to Clause-28 view.

5.4:0 – LP Advertise Selector Field

Bits 5.4:0 indicate the state of the Link Partner’s Selector Field. The local PHY does not otherwise use these bits.

23.2.7 Register 6 (06h) – Auto-Negotiation Expansion Register

6.15:5 – Reserved

6.4 – Parallel Detection Fault

Parallel Detection Fault returns a “1” when a parallel detection fault occurs in the local auto-negotiation state machine. Once

set, this bit is automatically cleared when (and only when) Register 6 is read.

Bit

Name

Access

States

Reset Value

Sticky

15:5

Reserved

00000000000

Parallel Detection Fault

RO LH

1 = Parallel detection fault

LP Next-Page Able

1 = LP Next-Page capable

Local PHY Next-Page Able

1 = Next-Page capable

Page Received

RO LH

1 = New page has been received

LP Auto-Negotiation Able

1 = LP auto-negotiation capable

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