Xilinx Virtex-4 - Page 145

Embedded Tri-Mode Ethernet MAC User Guide www.xilinx.com 145
UG074 (v2.2) February 22, 2010
1000BASE-X PCS/PMA
R
Table 4-16: Auto-Negotiation Next Page Transmit Register (Register 7)
Bit(s) Name Description Attributes Default Value
7.15 Next Page
1 = Additional next page(s) follow
0 = Last page.
Read/Write 0
7.14 Reserved Always returns 0.Returns 00
7.13 Message Page
1 = Message Page.
0 = Unformatted Page.
Read/Write 1
7.12 Acknowledge 2
1 = Complies with message.
0 = Cannot comply with message.
Read/Write 0
7.11 Toggle
Value toggles between subsequent
pages.
Read Only 0
7.10:0
Message or
Unformatted
Code Field
Message code field or unformatted page
encoding as dictated by 7.13.
Read/Write
00000000001
(Null Message Code)
Table 4-17: Auto-Negotiation Next Page Receive Register (Register 8)
Bit(s) Name Description Attributes Default Value
8.15 Next Page
1 = Additional Next Page(s) 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
8.12 Acknowledge 2
1 = Complies with message.
0 = Cannot comply with message.
Read Only 0
8.11 Toggle
Value toggles between subsequent next
pages.
Read Only 0
8.10:0
Message /
Unformatted
Code Field
Message code field or unformatted page
encoding as dictated by 8.13.
Read Only 00000000000
Table 4-18: Extended Status Register (Register 15)
Bit(s) Name Description Attributes Default Value
15.15
1000BASE-X
Full Duplex
The Ethernet MAC always returns a 1
for this bit because 1000BASE-X full
duplex is supported.
Returns 11
15.14
1000BASE-X
Half Duplex
The Ethernet MAC always returns a 0
for this bit because 1000BASE-X half
duplex is not supported.
Returns 00
15.13
1000BASE-T
Full Duplex
The Ethernet MAC always returns a 0
for this bit because 1000BASE-T full
duplex is not supported.
Returns 00
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