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IXF1104 4-Port Gigabit Ethernet Media Access Controller
Datasheet 76
Document Number: 278757
Revision Number: 009
Revision Date: 27-Oct-2005
5.1.4 Fiber Mode
When the IXF1104 MAC is configured for fiber mode, the TX Data path from the MAC is an
internal
10-bit interface as described in the IEEE 802.3z specification. It is connected directly to an internal
SerDes block for serialization/deserialization and transmission/reception on the fiber medium to
and from the link partner.
The MAC contains all of the PCS (8B/10B encoding and 10B/8B decoding) required to encode and
decode the data. The MAC also supports auto-negotiation per the IEEE 802.3z specification via
access to the “TX Config Word ($ Port_Index + 0x17)", “RX Config Word ($ Port_Index + 0x16)",
and “Diverse Config Write ($ Port_Index + 0x18)".
Table 24. Operational Mode Configuration Registers
Register Name
Register
Address
Description
“Desired Duplex
($ Port_Index +
0x02)"
0x002 – Port 0
0x082 – Port 1
0x102 – Port 2
0x182 – Port 3
The “Desired Duplex ($ Port_Index + 0x02)” on page 163 defines
whether a port is to be configured for full-duplex or half-duplex
operation.
NOTE: Half-duplex operation is only valid for 10/100 speeds where the
RGMII line interface has been selected.
“MAC IF Mode
and RGMII
Speed ($
Port_Index +
0x10)"
0x010 – Port 0
0x090 – Port 1
0x110 – Port 2
0x190 – Port 3
The “MAC IF Mode and RGMII Speed ($ Port_Index + 0x10)” on
page 167 determines the MAC operational frequency and mode for a
given port.
NOTE: Set the “Clock and Interface Mode Change Enable Ports 0 - 3
($0x794)” on page 221 to 0x0 prior to any change in the
register value. This ensures that a change in the MAC clock
frequency is controlled correctly. If the “Clock and Interface
Mode Change Enable Ports 0 - 3 ($0x794)" is not used
correctly, the IXF1104 MAC may not be configured to the
proper mode.
“Port Enable
($0x500)"
0x500
Bit 0 – Port 0
Bit 1 – Port 1
Bit 2 – Port 2
Bit 3 – Port 3
Each “Port Enable ($0x500)" bit relates to a port. Set the appropriate bit
to 0x1 to enable a port. This should be the last step in the configuration
process for a port.
“Interface Mode
($0x501)"
0x501
Bit 0 – Port 0
Bit 1 – Port 1
Bit 2 – Port 2
Bit 3 – Port 3
The “Interface Mode ($0x501)" selects whether a port operates with a
copper (RGMII or GMII) line-side interface an integrated SerDes fiber
line-side interface.
For copper operation for a given port, set the relevant bit to 0x1.
For fiber operation for a given port, set the relevant bit to 0x0.
NOTE: All ports are configured for fiber operation in the IXF1104 MAC
default mode of operation.
“Clock and
Interface Mode
Change Enable
Ports 0 - 3
($0x794)"
0x794
Bit 0 – Port 0
Bit 1 – Port 1
Bit 2 – Port 2
Bit 3 – Port 3
The “Clock and Interface Mode Change Enable Ports 0 - 3 ($0x794)"
indicates to an internal clock generator when to sample the new value
of the “MAC IF Mode and RGMII Speed ($ Port_Index + 0x10)" and the
“Interface Mode ($0x501)" (copper/fiber).
When any of these two configuration values are changed for a port, the
corresponding bits must be kept in this register under reset by writing
0x0 to the relevant bit.
NOTE: The initialization sequence provided in Section 6.1, “Change Port Mode Initialization Sequence” on
page 130 must be followed for proper configuration of the IXF1104 MAC.