Xilinx Virtex-4 - Page 143

Embedded Tri-Mode Ethernet MAC User Guide www.xilinx.com 143
UG074 (v2.2) February 22, 2010
1000BASE-X PCS/PMA
R
3.9:4
Manufacturer’s
Model Number
Always returns 0s. Returns 0s 000000
3.3:0
Revision
Number
Always returns 0s. Returns 0s 0000
Table 4-12: PHY Identifier (Registers 2 and 3) (Cont’d)
Bit(s) Name Description Attributes Default Value
Table 4-13: Auto-Negotiation Advertisement Register (Register 4)
Bit(s) Name Description Attributes Default Value
4.15 Next Page
1 = Next page functionality is
advertised
0 = Next page functionality is not
advertised
Read/Write 0
4.14 Reserved Always returns 0, writes ignored. Returns 00
4.13:12 Remote Fault
00 = No error.
01 = Offline.
10 = Link failure.
11 = Auto-negotiation error.
Read/Write
Self clearing
to 00 after
auto-
negotiation
00
4.11:9 Reserved Always return 0, writes ignored. Returns 00
4.8:7 Pause
00 = No PAUSE.
01 = Symmetric PAUSE.
10 = Asymmetric PAUSE towards link
partner.
11 = Both symmetric PAUSE and
asymmetric PAUSE towards link
partner.
Read/Write 11
4.6 Half Duplex
The Ethernet MAC always returns a 0
for this bit because half-duplex mode is
not supported.
Returns 00
4.5 Full Duplex
1 = Full-duplex mode is advertised.
0 = Full-duplex mode is not advertised.
Read/Write 1
4.4:0 Reserved Always returns 0s, writes ignored. Returns 0s 00000
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