KSZ8893MQL-EVAL Micrel Inc, KSZ8893MQL-EVAL Datasheet - Page 30

• Manufacturer Part Number: KSZ8893MQL-EVAL
• Description: EVAL KIT EXPERIMENTAL KSZ8893MQL
• Manufacturer: Micrel Inc

Specifications of KSZ8893MQL-EVAL

• Main Purpose: Interface, Ethernet Controller (PHY and MAC)
• Embedded: No
• Utilized Ic / Part: KSZ8893MQL
• Primary Attributes: 3 Ports, 100BASE-TX/100BASE-FX/10BASE-T, Managed
• Secondary Attributes: MII, RMII, SNI, Auto MDI, MDI-X Auto Polarity Correction, LinkMD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-1603

10BASE-T Receive
On the receive side, input buffers and level detecting squelch circuits are employed. A differential input receiver
circuit and a phase-locked loop (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 400mV or with
short pulse widths to prevent noise 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 KSZ8893MQL/MBL decodes a data
frame. The receiver clock is maintained active during idle periods in between data reception.
Power Management
The KSZ8893MQL/MBL features a per-port power down mode. To save power, a PHY port that is not in use can
be powered down via port control register, or MIIM PHY register.
In addition, there is a full chip power down mode. When activated, the entire chip is powered down.
MDI/MDI-X Auto Crossover
To eliminate the need for crossover cables between similar devices, the KSZ8893MQL/MBL supports HP Auto
MDI/MDI-X and IEEE 802.3u standard MDI/MDI-X auto crossover. HP Auto MDI/MDI-X is the default.
The auto-sense function detects remote transmit and receive pairs and correctly assigns transmit and receive
pairs for the KSZ8893MQL/MBL device. This feature is extremely useful when end users are unaware of cable
types, and also, saves on an additional uplink configuration connection. The auto-crossover feature can be
disabled through the port control registers, or MIIM PHY registers.
The IEEE 802.3u standard MDI and MDI-X definitions are:
December 2007
RJ-45 Pins
1
2
3
6
MDI
Table 2. MDI/MDI-X Pin Definitions
Signals
RD+
TD+
RD-
TD-
30
RJ-45 Pins
1
2
3
6
MDI-X
Signals
RD+
TD+
RD-
TD-
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