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IXF1104 Quad-Port 10/100/1000 Mbps Ethernet Media Access Controller
106 Datasheet
Document Number: 278757
Revision Number: 007
Revision Date: March 25, 2004
5.7 Optical Module Interface
This section describes the connection of the IXF1104 ports to an Optical Module Interface and
details the minimal connections that are supported for correct operation. The registers used for
write control and read status information are documented.
The Optical Module Interface allows the IXF1104 a seamless connection to the Small Form Factor
Optical Modules (SFP) that form the system’s physical media connection, eliminating the need for
any FPGAs or CPUs to process data. All required optical module information is available to the
system CPU through the IXF1104 CPU interface, leading to a more integrated, reliable, and cost-
effective system.
The IXF1104 supports all the functions required for the Small Form Factor pluggable Multi-Source
Agreement (MSA).
There are specific mechanical and electrical requirements for the size, form factor, and connections
supported on all Optical Module Interfaces. There are also specific requirements for each Optical
Module Interface that supports a particular media requirement or interface configuration. These
requirements are detailed in the relevant specifications or manufacturers’ datasheets.
5.7.1 IXF1104-Supported Optical Module Interface Signals
To describe the Optical Module Interface operation, three supported signal subgroups are required,
allowing a more explicit definition of each function and implementation. The three subgroups are
as follows:
• High-Speed Serial Interface
• Low-Speed Status Signaling Interface
• I²C Module Configuration Interface
Table 30 provides descriptions for IXF1104-to-SFP optical module connection signals.
Table 30. IXF1104-to-SFP Optical Module Interface Connections (Sheet 1 of 2)
IXF1104
Signal Names
SFP Signal
Names
Description Notes
TX_P_0:3 TD+ Transmit Data, Differential LVDS Output from the IXF1104
TX_N_0:3 TD- Transmit Data, Differential LVDS Output from the IXF1104
RX_P_0:3 RD+ Receive Data, Differential LVDS Input to the IXF1104
RX_N_0:3 RD- Receive Data, Differential LVDS Input to the IXF1104
I
2
C_CLK MOD-DEF1
I
2
C_CLK output from the IXF1104
(SCL)
Output from the IXF1104
I
2
C_DATA_0:3 MOD-DEF2 I
2
C_DATA I/O (SDA) Input/Output
MOD_DEF_0:3 MOD-DEF0
MOD_DEF_0 is TTL Low level during
normal operation.
Input to the IXF1104