ksz8893mqlam Micrel Semiconductor, ksz8893mqlam Datasheet - Page 55
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ksz8893mqlam
Manufacturer Part Number
ksz8893mqlam
Description
Integrated 3-port 10/100 Managed Switch With Phys
Manufacturer
Micrel Semiconductor
Datasheet
1.KSZ8893MQLAM.pdf
(116 pages)
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Near-end (Remote) Loopback
Near-end (Remote) loopback is conducted at either PHY port 1 or PHY port 2.of the KSZ8893MQL/MBL. 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.
December 2007
RXP1 /
RXM 1
RXP2 /
RXM2
Figure 13. Near-end (Remote) Loopback Path
PMD/PMA
PMD/PMA
Switch
Port 1
MAC
MAC
PHY
PCS
PCS
Port 2
PHY
55
TXP2 /
TXM2
TXP1 /
TXM 1
M9999-121007-1.5
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