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KSZ8873MLLJ Datasheet(PDF) 41 Page - Micrel Semiconductor |
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KSZ8873MLLJ Datasheet(HTML) 41 Page - Micrel Semiconductor |
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41 / 108 page 
Micrel, Inc. KSZ8873MLLJ September 2011 41 M9999-091911-1.8 Loopback Support The KSZ8873MLLJ provides loopback support for remote diagnostic of failure. In loopback mode, the speed at both PHY ports needs to be set to 100BASE-TX. Two types of loopback are supported: Far-end Loopback and Near-end (Remote) Loopback. Far-end Loopback Far-end loopback is conducted between the KSZ8873MLLJ’s two PHY ports. The loopback is limited to few package a time for diagnosis purpose and can not support large traffic. The loopback path starts at the “Originating.” PHY port’s receive inputs (RXP/RXM), wraps around at the “loopback” PHY port’s PMD/PMA, and ends at the “Originating” PHY port’s transmit outputs (TXP/TXM). Bit [0] of registers 29 and 45 is used to enable far-end loopback for ports 1 and 2, respectively. Alternatively, the MII Management register 0, bit [14] can be used to enable far-end loopback. The far-end loopback path is illustrated in the following figure. Figure 14. Far-End Loopback Path |
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