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KS8993M Datasheet(PDF) 22 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) 22 Page - Micrel Semiconductor

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Micrel, Inc.
KS8993M/ML/MI
April 2005
22
M9999-041205
magnetic. They are internally wave-shaped and pre-emphasized into outputs with a typical 2.3V amplitude. The
harmonic contents are at least 27dB below the fundamental when driven by an all-ones Manchester-encoded
signal.
10BASE-T Receive
On the receive side, input buffers and level detecting squelch circuits are employed. A differential input receiver
circuit and a PLL perform the decoding function. The Manchester-encoded data stream is separated into clock
signal and NRZ data. A squelch circuit rejects signals with levels less than 400 mV or with short pulse widths in
order to prevent noises at the RXP or RXM input from falsely triggering the decoder. When the input exceeds the
squelch limit, the PLL locks onto the incoming signal and the KS8993M decodes a data frame. The receiver clock
is maintained active during idle periods in between data reception.
Power Management
The KS8993M features a per-port power down mode. To save power, the user can power down ports that are not
in use by setting the port control registers, or MII control registers. In addition, there is a full chip power down
mode. When activated, the entire chip will be shut down.
MDI /MDI-X Auto Crossover
The KS8993M supports MDI/ DI-X auto crossover. This facilitates the use of either a straight connection CAT-5
cable or a crossover CAT-5 cable. The auto-sense function will detect remote transmit and receive pairs, and
correctly assign the transmit and receive pairs from the KS8993M device. This feature can be extremely useful
when end users are unaware of cable types and can also save on an additional uplink configuration connection.
The auto-crossover feature can be disabled through the port control registers.
Based on the IEEE 802.3 standard, the MDI and MDI-X definitions are as follows:
MDI
MDI-X
RJ45 Pins
Signals
RJ-45 Pins
Signals
1
TD+
1
RD+
2
TD-
2
RD-
3
RD+
3
TD+
6
RD-
6
TD-
Table 2. MDI/MDI-X Pin Definitions


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