VSC8221 datasheet(75/138 Pages) MICROSEMI

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VSC8221

Data Sheet

VMDS-10106 Revision 4.1

December 2006

75 of 106

106

7.11 – Toggle

The Toggle bit is used by the arbitration function in the local PHY to ensure synchronization with the Link Partner during Next-

Page exchanges. The Toggle bit is automatically set to the opposite state of the Toggle bit in the previously exchanged Link

Code Word.

7.10:0 – Message/Unformatted Code

The Message/Unformatted Code bits indicate the message code being transmitted to the Link Partner. The local PHY passes

the message code to the Link Partner without interpreting or reacting to it. By default, this code is set to “000 0000 0001”,

indicating a null message.

23.2.9 Register 8 (08h) – Auto-Negotiation Link Partner Next-Page Receive Register

SMi Register 8 contains the Link Partner’s Next-Page register contents. The contents of this register are only valid when the

Page Received bit (6.1) is set.

8.15 – LP Next Page

This bit indicates if more pages follow from the Link Partner.

8.14 – LP Acknowledge

This bit returns a “1” when the Link Partner signals that it has 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.

8.13 – LP Message Page

The Message Page bit indicates if the page received from the Link Partner is a message page or an unformatted page.

8.12 – LP Acknowledge2

The Acknowledge2 bit indicates whether the Link Partner MAC reports that it is able to act on the information (or perform the

task) indicated in the message. The local PHY does not interpret or act on changes in the state of this bit.

8.11 – LP Toggle

The Toggle bit is used by the arbitration function in the local PHY to ensure synchronization with the Link Partner during Next-

Page exchanges. in the Link Partner, the Toggle bit is automatically set to the opposite state of the Toggle bit in the previously

exchanged Link Code Word from the Link Partner.

Bit

Name

Access

States

Reset Value

Sticky

LP Next Page

1 = More pages follow

0 = Last page

LP Acknowledge

1 = LP acknowledge

LP Message Page

1 = Message page

0 = Unformatted page

LP Acknowledge2

1 = LP will comply with request

LP Toggle

1 = Previous transmitted LCW == 0

0 = Previous transmitted LCW == 1

10:0

LP Message/Unformatted Code

00000000000

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