Ethernet 1000BASE-X PCS/PMA or SGMII v9.1 www.xilinx.com 127
UG155 March 24, 2008
Management Registers
R
Register 8: Next Page Receive
Table 9-9: Auto-Negotiation Next Page Transmit (Register 7)
Bit(s) Name Description Attributes Default Value
7.15 Next Page 1 = Additional Next Page(s) will follow
0 = Last page
read/
write
0
7.14 Reserved Always returns ‘0’ returns 0 0
7.13 Message
Page
1 = Message Page
0 = Unformatted Page
read/
write
1
7.12 Acknowled
ge 2
1 = Comply with message
0 = Cannot comply with message
read/
write
0
7.11 Toggle Value toggles between subsequent Next
Pages
read only 0
7.10:0 Message /
Unformatte
d Code
Field
Message Code Field or Unformatted Page
Encoding as dictated by 7.13
read/
write
00000000001
(Null
Message
Code)
MDIO Register 8: Next Page Receive
Table 9-10: Auto-Negotiation Next Page Receive (Register 8)
Bit(s) Name Description Attributes Default Value
8.15 Next Page 1 = Additional Next Page(s) will
follow
0 = Last page
read only 0
8.14 Acknowledge Used by Auto-Negotiation function
to indicate reception of a link
partner’s base or next page
read only 0
8.13 Message Page 1 = Message Page
0 = Unformatted Page
read only 0
NEXT PAGE
ACKNOWLEDGE
MESSAGE PAGE
15 14 13 12 11 0
Reg 8
TOGGLE
MESSAGE CODE
ACKNOWLEDGE 2
10
To Next Page
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