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KSZ8873MLLJ Datasheet(PDF) 41 Page - Micrel Semiconductor

Part No. KSZ8873MLLJ
Description  Integrated 3-Port 10/100 Managed Switch with PHYs
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Maker  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
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KSZ8873MLLJ Datasheet(HTML) 41 Page - Micrel Semiconductor

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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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