KSZ8851-16MLL TR Micrel Inc, KSZ8851-16MLL TR Datasheet - Page 32
KSZ8851-16MLL TR
Manufacturer Part Number
KSZ8851-16MLL TR
Description
Single Ethernet Port + Generic (16-bit) Bus Interface( )
Manufacturer
Micrel Inc
Datasheet
1.KSZ8851-16MLL_TR.pdf
(79 pages)
Specifications of KSZ8851-16MLL TR
Operating Supply Voltage (typ)
3.3V
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Pin Count
48
Lead Free Status / RoHS Status
Compliant
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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
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