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IXF1104 4-Port Gigabit Ethernet Media Access Controller
109 Datasheet
Document Number: 278757
Revision Number: 009
Revision Date: 27-Oct-2005
5.7.2.2.2 TX_FAULT_0:3
TX_FAULT_0:3 are inputs to the IXF1104 MAC. These signals are pulled to a logic Low level by
the optical module during normal operation. A logic Low level on these signals indicates no fault
condition exists. If a fault is present, a logic High is received through the use of an external pull-up
resistor at the IXF1104 MAC pad.
The status of each bit (one for each port) can be found in bits [13:10] of the “Optical Module Status
Ports 0-3 ($0x799)” on page 222. Any change in the state of these bits causes a logic Low level on
the TX_FAULT_INT output if this operation is enabled.
5.7.2.2.3 RX_LOS_0:3
RX_LOS_0:3 are inputs to the IXF1104 MAC. These signals are pulled to a logic Low level by the
optical module during normal operation, which indicates that no loss-of-signal exists. If a loss-of-
signal occurs, a logic High is received on these inputs through the use of an external pull-up
resistor at the IXF1104 MAC device pad.
The status of each bit (one for each port) is found in “Optical Module Status Ports 0-3 ($0x799)"
bits [23:20]. Any change in the state of these bits causes a logic Low level on the RX_LOS_INT
output if this operation is enabled.
5.7.2.2.4 TX_DISABLE_0:3
TX_DISABLE_0:3 are outputs from the IXF1104 MAC. These signals are driven to a logic Low
level by the IXF1104 MAC during normal operation. This indicates that the optical module
transmitter is enabled. If the optical module transmitter is disabled, this signal is switched to a logic
High level. On the IXF1104 MAC, these outputs are open drain types and pulled up by the 4.7 k to
10 k pull-up resistor at the Optical Module Interface. Each of these signals is controlled through
bits 3:0 respectively of the “Optical Module Control Ports 0 - 3 ($0x79A)".
5.7.2.2.5 MOD_DEF_INT
MOD_DEF_INT is a single output, open-drain type signal and is active Low. A change in state of
any MOD_DEF_0:3 inputs causes this signal to switch Low and remain in this state until a read of
the “Optical Module Status Ports 0-3 ($0x799)". The signal then returns to an inactive state.
5.7.2.2.6 TX_FAULT_INT
TX_FAULT_INT is a single output, open-drain type signal and is active Low. A change in state of
any TX_FAULT_0:3 inputs causes this signal to switch Low and remain in this state until a read of
the “Optical Module Status Ports 0-3 ($0x799)". The signal then returns to an inactive state.
5.7.2.2.7 RX_LOS_INT
RX_LOS_INT is a single output, open-drain type signal and is active low. A change in state of any
of the RX_LOS_3:0 inputs causes this signal to switch low and remain in this state until a Read of
the “Optical Module Status Ports 0-3 ($0x799)" has taken place. The signal returns to an inactive
state.
Note: MOD_DEF_INT, TX_FAULT_INT, and RX_LOS_INT are open-drain type outputs. With the
three signals on the device, the system can decide which “Optical Module Status Ports 0-3