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Bused MII Mode The LU3X54FT has been designed for operation in two basic system interface modes of operation: Normal MII Mode (Four Separate MII Ports). The separate mode provides four independent RJ-45 to MII ports and is similar to having four independent 10/100 transceivers. Bused MII Mode. This mode is designed specifically for repeater applications to save pins. In bused mode: - Data from all of the ports operating at 100 Mbits/s will be internally bused to system interface port A (100 Mbits/s MII interface). - Data from all of the ports operating at 10 Mbits/s will be internally bused to system interface port B (7-pin 10 Mbits/s serial interface). The LU3X54FT will automatically detect the speed of each port (10 Mbits/s or 100 Mbits/s) and route the data to the appropriate port.
LU3X54FT Maximum Ratings
Parameter
Min
Symbol
Max
Unit
Ambient Operating Temperature
0
T A
70
°C
Storage Temperature
-40
T stg
125
°C
Power Dissipation
-
P D
3.5
W
Voltage on Any Pin with Respect to Ground
-0.5
-
V DD + 0.5
V
Maximum Supply Voltage
-
-
5.5
V
LU3X54FT Features
Autopolarity detection and correction Adjustable squelch level for extended line length capability (two levels) Interfaces with IEEE 802.3u media independent nterface (MII) or a serial 10 Mbits/s 7-pin interface On-chip filtering eliminates the need for external filters Half- and full-duplex operations