KS8993F A5 Micrel Inc, KS8993F A5 Datasheet - Page 27

• Manufacturer Part Number: KS8993F A5
• Manufacturer: Micrel Inc

Specifications of KS8993F A5

• Number Of Primary Switch Ports: 3
• Internal Memory Buffer Size: 32
• Operating Supply Voltage (typ): 1.8/2.5/3.3V
• Fiber Support: Yes
• Integrated Led Drivers: Yes
• Phy/transceiver Interface: MII/SNI
• Power Supply Type: Analog/Digital
• Package Type: PQFP
• Data Rate (typ): 10/100Mbps
• Vlan Support: Yes
• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Pin Count: 128
• Mounting: Surface Mount
• Jtag Support: No
• Operating Supply Voltage (max): 1.89/3.465V
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Not Compliant

KS8993F
The KS8993F supports auto MDI/MDI-X 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 KS8993F device. This feature can be extremely useful when the end
users are unaware of cable type differences, and can also save on an additional uplink configuration connection.
By default, auto MDI/MDI-X is enabled. It can be disabled through the port control registers.
Based on the IEEE 802.3 standard, the MDI and MDI-X definitions are as follows:
A “Straight Cable” connects a MDI device to a MDI-X device, or a MDI-X device to a MDI device. The following diagram depicts a
typical “Straight Cable” connection between a NIC card (MDI) and a switch, or hub (MDI-X).
August 26, 2004
RJ45 pins
1
2
3
6
MDI
Table 2: MDI/MDI-X Pin Definition
Signals
RD+
TD+
RD-
TD-
- 27 -
RJ45 pins
1
2
3
6
MDI-X
Signals
RD+
TD+
RD-
TD-
Revision 1.0
Micrel