KSZ8893-MQL Micrel Semiconductor, Inc., KSZ8893-MQL Datasheet - Page 48

• Manufacturer Part Number: KSZ8893-MQL
• Description: Integrated 3-Port 10/100 Managed Switch with PHYs
• Manufacturer: Micrel Semiconductor, Inc.

Near-end (Remote) Loopback
Near-end (Remote) loopback is conducted at either PHY port 1 or PHY port 2.of the KSZ8893MQL. The
loopback path starts at the PHY port’s receive inputs (RXPx/RXMx), wraps around at the same PHY port’s
PMD/PMA, and ends at the PHY port’s transmit outputs (TXPx/TXMx).
Bit [1] of registers 26 and 42 is used to enable near-end loopback for ports 1 and 2, respectively. Alternatively,
the MII Management register 31, bit [1] can be used to enable near-end loopback.
The near-end loopback paths are illustrated in the following figure.
Micrel
November 2005
RXP1 /
RXM 1
RXP2 /
RXM 2
Figure 13. Near-end (Remote) Loopback Path
PMD/PMA
PMD/PMA
Switch
Port 1
MAC
MAC
PHY
PCS
PCS
Port 2
PHY
48
TXP2 /
TXM2
TXP1 /
TXM 1
KSZ8893MQL/MQLI
M9999-111705