4.4.7. Unidirectional Feature
The MAC TX implements the unidirectional feature as specified by clause 66 in the IEEE802.3 specification. This is an optional feature supported only in 10G operations. When you enable this feature, two output ports—unidirectional_en, unidirectional_remote_fault_dis— and two register fields—UniDir_En (Bit 0), UniDirRmtFault_Dis (Bit 1)— are accessible to control the TX XGMII interface.
|Bit 0 Register Field||Bit 1 Register Field||Link Status||TX XGMII Interface Behavior|
|Don't care||Don't care||No link fault||Continue to allow normal packet transmission.|
|0||Don't care||Local fault||Immediately override the current content with remote fault sequence.|
|1||0||Local fault||Continue to send packet if there is one. Otherwise, override the IPG/IDLE bytes with remote fault sequence.4|
|1||1||Local fault||Continue to allow normal packet transmission (similar to no link fault).|
|0||Don't care||Remote fault||Immediately override the current content with IDLE control characters.|
|1||Don't care||Remote fault||Continue to allow normal packet transmission (similar to no link fault).|
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