KSZ8863FLLI Micrel Inc, KSZ8863FLLI Datasheet - Page 41

• Manufacturer Part Number: KSZ8863FLLI
• Description: IC ETHERNET SWITCH 3PORT 48-LQFP
• Manufacturer: Micrel Inc

Specifications of KSZ8863FLLI

• Controller Type: Ethernet Switch Controller
• Interface: MII
• Voltage - Supply: 1.8V, 2.5V, 3.3V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Lead Free Status / RoHS Status: Supplier Unconfirmed, Lead free / RoHS Compliant
• Other names: 576-3750

Micrel, Inc.
KSZ8863MLL/FLL/RLL
Loopback Support
The KSZ8863MLL/FLL/RLL 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 KSZ8863MLL/FLL/RLL’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
August 2010
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M9999-081810-1.2