Xilinx Virtex-4 - Page 141

Embedded Tri-Mode Ethernet MAC User Guide www.xilinx.com 141
UG074 (v2.2) February 22, 2010
1000BASE-X PCS/PMA
R
0.11 Power Down
1 = Power down.
0 = Normal operation.
When set to 1, the MGT is placed in a
Low power state. This bit requires a
reset (see bit 0.15) to clear.
Read/ Write TIEEMAC#CONFIGVEC[75]
0.10 Isolate
1 = Electrically isolate the PHY
from GMII.
0 = Normal operation.
Read/Write TIEEMAC#CONFIGVEC[76]
0.9
Restart Auto-
Negotiation
1 = Restart auto-negotiation process.
0 = Normal operation.
Read/Write
Self Clearing
0
0.8 Duplex Mode
The Ethernet MAC always returns a 1
for this bit to signal full-duplex mode.
Returns 11
0.7 Collision Test
The Ethernet MAC always returns a 0
for this bit to disable COL test.
Returns 00
0.6
Speed Selection
(MSB)
The Ethernet MAC always returns a 1
for this bit. Together with bit 0.13, speed
selection of 1000 Mb/s is identified.
Returns 11
0.5:0 Reserved Always returns zeros, writes ignored. Returns 0s 000000
Table 4-10: Control Register (Register 0) (Cont’d)
Bit(s) Name Description Attributes Default Value
Table 4-11: Status Register (Register 1)
Bit(s) Name Description Attributes Default Value
1.15 100BASE-T4
The Ethernet MAC always returns a 0
for this bit because 100BASE-T4 is not
supported.
Returns 00
1.14
100BASE-X
Full Duplex
The Ethernet MAC always returns a 0
for this bit because 100BASE-X full
duplex is not supported.
Returns 00
1.13
100BASE-X
Half Duplex
The Ethernet MAC always returns a 0
for this bit because 100BASE-X half
duplex is not supported.
Returns 00
1.12
10 Mb/s
Full Duplex
The Ethernet MAC always returns a 0
for this bit because 10 Mb/s full duplex
is not supported.
Returns 00
1.11
10 Mb/s
Half Duplex
The Ethernet MAC always returns a 0
for this bit because 10 Mb/s half duplex
is not supported.
Returns 00
1.10
100BASE-T2
Full Duplex
The Ethernet MAC always returns a 0
for this bit because 100BASE-T2 full
duplex is not supported.
Returns 00
1.9
100BASE-T2
Half Duplex
The Ethernet MAC always returns a 0
for this bit because 100BASE-T2 half
duplex is not supported.
Returns 00
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