VSC8221 datasheet(74/138 Pages) MICROSEMI

74 / 138 page

VSC8221

Data Sheet

VMDS-10106 Revision 4.1

December 2006

74 of 106

106

6.3 – LP Next-Page Able

LP Next-Page Able returns a “1” when the Link Partner has Next-Page capabilities. This bit is used in the auto-negotiation state

machines, as defined in Clause 28 of iEEE 802.3. The state of this bit is valid when either the Auto-Negotiation Complete bit

(1.5) or the Page Received bit (6.1) is set.

6.2 – Local PHY Next-Page Able

Since the VSC8221 is next-page capable during Clause-28 auto-negotiation, this bit is hard-wired to “1”.

6.1 – Page Received

Page Received is set to “1” when a new Link Code Word is received from the Link Partner, validated, and acknowledged. Page

Received is automatically cleared when (and only when) Register 6 is read via the SMi.

6.0 – LP Auto-Negotiation Able

LP Auto-Negotiation Able is set to “1” if the Link Partner advertises auto-negotiation capability. The state of this bit is valid when

the Auto-Negotiation Complete bit (1.5) or the Page Received bit (6.1) is set.

23.2.8 Register 7 (07h) – Auto-Negotiation Next-Page Transmit Register

7.15 – Next Page

The Next Page bit indicates whether this is the last Next-Page to be transmitted. By default, this bit is set to “0”, indicating that

this is the last page.

7.14 – Reserved

7.13 – Message Page

The Message Page bit indicates whether this page is a message page or an unformatted page. This bit does not otherwise

affect the operation of the local PHY. By default, this bit is set to “1”, indicating that this is a message page.

7.12 – Acknowledge2

The Acknowledge2 bit indicates if the local MAC reports that it is able to act on the information (or perform the task) indicated in

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

Bit

Name

Access

States

Reset Value

Sticky

R/W

1 = More pages follow

0 = Last page

Reserved

Message Page

R/W

1 = Message page

0 = Unformatted page

Acknowledge2

R/W

1 = Will comply with request

0 = Cannot comply with request

Toggle

1 = Previous transmitted LCW == 0

0 = Previous transmitted LCW == 1

10:0

Message/Unformatted Code

R/W

00000000001

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