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Intel
IXF1104 4-Port Gigabit Ethernet Media Access Controller
When configured for fiber mode, the full set of Optical Module interface control and status signals
is presented through re-use of GMII signals on a per-port basis (see
Connections" on page
5.1.4.1
Fiber Auto-Negotiation
Auto-negotiation is performed by using the
Word ($ Port_Index +
autoneg_enable
performs hardware-defined auto-negotiation with the
used as an
Port_Index + 0x16)"
0x65)".
Note:
While the MAC supports auto-negotiation functions, the IXF1104 MAC does not automatically
configure the MAC or other device blocks to be consistent with the auto-negotiation results. This
configuration is done by the user and system software.
5.1.4.2
Determining If Link Is Established in Auto-Negotiation Mode
A valid link is established when the AN_complete bit is set and the RX_Sync bit reports that
synchronization has occurred. Both register bits are located in the
+
0x16)".
If the link goes down after auto-negotiation is completed, RX_Sync indicates that a loss of
synchronization occurred. The IXF1104 MAC restarts auto-negotiation and attempts to reestablish
a link. Once a link is reestablished, the AN_complete bit is set and the RX_Sync bit shows that
synchronization has occurred.
To manually restart auto-negotiation, bit 5 of the
(AN_enable) must be de-asserted, then re-asserted.
5.1.4.3
Fiber Forced Mode
The MAC fiber operation can be forced to operate at 1000 Mbps full-duplex without completion of
the auto-negotiation function. In this mode, the MAC RX path must achieve synchronization with
the link partner. Once achieved, the MAC TX path is enabled to allow data transmission. This
forced mode is limited to operation with a link partner that operates with a full-duplex link at
1000 Mbps.
5.1.4.4
Determination of Link Establishment in Forced Mode
When the IXF1104 MAC is in forced mode operation, the
0x16)"
bit 20 RX Sync indicates when synchronization occurs and a valid link establishes.
Note:
The RX Sync bit indicates a loss of synchronization when the link is down.
5.1.5
Copper Mode
In copper mode, the IXF1104 MAC transmits data on the egress path of the RGMII or GMII
interface, depending on the port configuration defined by the user. The copper MAC receives data
on the ingress path of the RGMII or GMII interface, depending on the port configuration defined
77
58). Fiber mode supports only full-duplex Gigabit operation.
0x16)", and
"Diverse Config Write ($ Port_Index +
("Diverse Config Write ($ Port_Index +
"Auto-Negotiation Advertisement ($ Port Index + 0x64)"
used as an
"Auto-Negotiation Link Partner Base Page Ability ($ Port Index +
Table 4.5 "Multiplexed Ball
"TX Config Word ($ Port_Index +
0x18)") is set, the IXF1104 MAC
"TX Config Word ($ Port_Index + 0x17)"
and the
"RX Config Word ($ Port_Index
"Diverse Config Write ($ Port_Index + 0x18)"
"RX Config Word ($ Port_Index +
0x17)",
"RX Config
0x18)". When
"RX Config Word ($
Datasheet
Document Number: 278757
Revision Number: 009
Revision Date: 27-Oct-2005
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