KS8993F A5 Micrel Inc, KS8993F A5 Datasheet - Page 27
KS8993F A5
Manufacturer Part Number
KS8993F A5
Description
Manufacturer
Micrel Inc
Datasheet
1.KS8993F_A5.pdf
(99 pages)
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
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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
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