Ethernet MAC
UG0331 User Guide Revision 15.0
431
Table 429 •
AN EXPANSION
Bit Number Name
Reset Value
Description
[15:3]
Reserved
0x0
Reserved.
2
NEXT PAGE ABLE
0x0
Returns ‘1’ on read to indicate that the local device supports the
next page function.
1
PAGE RECEIVED
0x0
Returns ‘1’ on read to indicates that a new page has been
received and stored in the applicable
register. This bit
latches High for detection by software when polling. The bit is
cleared on a read to the register.
0
Reserved
0x0
Reserved.
Table 430 •
AN NEXT PAGE TRANSMIT
Bit Number Name
Reset Value
Description
15
NEXT PAGE
0x0
Assert this bit to indicate additional Next Pages to follow. Clear
the bit to indicate the last page.
14
Reserved
0x0
Reserved
13
MESSAGE PAGE
0x0
Assert this bit to indicate a Message Page. Clear the bit to
indicate an Unformatted Page.
12
ACKNOWLEDGE 2
0x0
Used by the Next Page function to indicate that the device has
the ability to comply with the message. Assert this bit if the local
device will comply with the message. Clear the bit if the local
device cannot comply with message.
11
TOGGLE
0x0
This bit is read only. Used to ensure synchronization with the
Link Partner during Next Page exchange. This bit always takes
the opposite value to the Toggle bit of the previously exchanged
Link Code Word. The initial value in the first Next Page
transmitted is the inverse of bit 11 in the base Link Code Word.
[10:0]
MESSAGE /
UNFORMATTED
CODE FIELD
0x0
Message pages are formatted pages that carry a predefined
Message Code, which is enumerated in IEEE 802.3u/Annex
28C.
Unformatted code fields take an arbitrary value.
Table 431 •
AN NEXT PAGE TRANSMIT
Bit Number Name
Reset Value
Description
15
NEXT PAGE
The Link Partner asserts this bit to indicate additional Next Pages
to follow. When ‘0’, indicates last Next Page from link partner.
14
Reserved
Reserved
13
MESSAGE PAGE
When ‘1’, indicates Message Page. When ‘0’, indicates
Unformatted Page.