KSZ8893MQL AM TR Micrel Inc, KSZ8893MQL AM TR Datasheet - Page 54
![no-image](/images/manufacturer_photos/0/4/434/micrel_inc_sml.jpg)
KSZ8893MQL AM TR
Manufacturer Part Number
KSZ8893MQL AM TR
Description
2+1 Port 10/100 Switch W/Tranceivers & Frame Buffers, 128-Ld PQFP ( )
Manufacturer
Micrel Inc
Datasheet
1.KSZ8893MQL_AM_TR.pdf
(116 pages)
Specifications of KSZ8893MQL AM TR
Lead Free Status / RoHS Status
Supplier Unconfirmed
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Loopback Support
The KSZ8893MQL/MBL 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 KSZ8893MQL/MBL’s two PHY ports. 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.
December 2007
R X P /
R X M
Figure 12: Far-End Loopback Path
P M D /P M A
P M D /P M A
S w itc h
O riginating
L oop B ack
P H Y P o rt
P H Y P o rt
M A C
M A C
P C S
P C S
54
T X P /
T X M
M9999-121007-1.5
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