KSZ8851-16MLL-EVAL Micrel Inc, KSZ8851-16MLL-EVAL Datasheet - Page 32

• Manufacturer Part Number: KSZ8851-16MLL-EVAL
• Description: BOARD EVALUATION KSZ8851-16MLL
• Manufacturer: Micrel Inc
• Series: LinkMD®r

Specifications of KSZ8851-16MLL-EVAL

• Main Purpose: Interface, Ethernet Controller (PHY and MAC)
• Embedded: No
• Utilized Ic / Part: KSZ8851-16MLL
• Primary Attributes: 1 Port, 100BASE-TX/10BASE-T
• Secondary Attributes: 8/16-Bit Interface, LinkMD Cable Diagnostics
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-3292

Micrel, Inc.
KSZ8851-16MLL/MLLI
Loopback Support
The KSZ8851-16MLL provides two loopback modes, one is Near-end (Remote) loopback to support for remote diagnostic
of failure at line side, and the other is Far-end (Local) loopback to support for local diagnostic of failure at host side. In
loopback mode, the speed at the PHY port will be set to 100BASE-TX full-duplex mode.
Near-end (Remote) Loopback
Near-end (Remote) loopback is conducted at PHY port 1 of the KSZ8851-16MLL. The loopback path starts at the PHY
port’s receive inputs (RXP1/RXM1), wraps around at the same PHY port’s PMD/PMA, and ends at the PHY port’s transmit
outputs (TXP1/TXM1).
Bit [9] of register P1SCLMD (0xF4) is used to enable near-end loopback. The ports 1 near-end loopback path is illustrated
in the following Figure 10.
Far-end (Local) Loopback
Far-end (Local) loopback is conducted at Host of the KSZ8851-16MLL. The loopback path starts at the host port’s
transmit inputs (Tx data), wraps around at the PHY port’s PMD/PMA, and ends at the host port’s receive outputs (Rx data)
Bit [14] of register P1MBCR (0xE4) is used to enable far-end loopback at host side. The host far-end loopback path is
illustrated in the following Figure 10.
Figure 10. PHY Port 1 Near-end (Remote) and Host Far-end (Local) Loopback Paths
August 2009
32
M9999-083109-2.0