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KS8993M Datasheet(PDF) 43 Page - Micrel Semiconductor

Part No. KS8993M
Description  Integrated 3-Port 10/100 Managed Integrated 3-Port 10/100 Managed
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Maker  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
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KS8993M Datasheet(HTML) 43 Page - Micrel Semiconductor

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Micrel, Inc.
KS8993M/ML/MI
April 2005
43
M9999-041205
Loopback Support
The KS8993M provides loopback support for remote diagnostic of failure. In loopback mode, the speed at both
PHY ports needs to be set to 100BASE-TX, and the “Priority Buffer reserve” bit needs to be set to 48 pre-
allocated buffers per output queue. The latter is required to prevent loopback packet drops and is achieved by
setting register 4 bit 0 to ‘1’.
Bit 0 of registers 29 and 45 is used to enable loopback for ports 1 and 2, respectively.
Alternatively, the MII Management register 0, bit 14 can be used to enable loopback.
Loopback is conducted between the KS8993M’s two PHY ports. The loopback path starts at the “Originating.”
PHY ports 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). The KS8993M loopback path is illustrated in the following
figure.
Figure 12. Loopback Path


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