
Table of Contents
Contents
Page
LU3X31FT Single-Port 3 V
10/100 Ethernet Transceiver TX/FX
Preliminary Data Sheet
July 2000
2
Lucent Technologies Inc.
Overview................................................................................................................................................................... 1
Features ................................................................................................................................................................... 1
Description................................................................................................................................................................ 4
Pin Information ......................................................................................................................................................... 5
Functional Description............................................................................................................................................ 11
Media Independent Interface (MII)...................................................................................................................... 11
Interface Signals ............................................................................................................................................... 11
Operation Modes............................................................................................................................................... 11
Serial Management Interface............................................................................................................................ 12
100Base-X Module.............................................................................................................................................. 12
100Base-X Transmitter ..................................................................................................................................... 13
100Base-X Receiver ........................................................................................................................................... 15
100Base-X Link Monitor...................................................................................................................................... 16
100Base-TX Transceiver..................................................................................................................................... 17
Transmit Drivers................................................................................................................................................ 17
Twisted-Pair Receiver....................................................................................................................................... 17
10Base-T Module................................................................................................................................................ 17
Operation Modes............................................................................................................................................... 18
Clock Synthesizer................................................................................................................................................ 19
Autonegotiation ................................................................................................................................................... 19
Reset Operation.................................................................................................................................................. 20
PHY Address..................................................................................................................................................... 21
Normal MII/Repeater Mode Select.................................................................................................................... 21
Fiber Mode Select............................................................................................................................................. 21
Autonegotiation and Speed Configuration......................................................................................................... 21
100Base-X PCS Configuration............................................................................................................................ 22
MII Registers .......................................................................................................................................................... 23
dc and ac Specifications......................................................................................................................................... 35
Absolute Maximum Ratings................................................................................................................................. 35
Clock Timing........................................................................................................................................................... 36
Outline Diagram...................................................................................................................................................... 47
80-Pin MQFP....................................................................................................................................................... 47
Technical Document Types.................................................................................................................................... 48
Ordering Information............................................................................................................................................... 49
Tables
Page
Table 1. Twisted-Pair Magnetic Interface ................................................................................................................. 5
Table 2. Fiber-Optic Transceiver Interface ............................................................................................................... 6
Table 3. Twisted-Pair Transceiver Control................................................................................................................ 6
Table 4. MII Interface ............................................................................................................................................... 6
Table 5. PHY Address Configuration....................................................................................................................... 7
Table 6. 100Base-X PCS Configuration................................................................................................................... 7
Table 7. Autonegotiation Configuration.................................................................................................................... 8
Table 8. Special Mode Configurations..................................................................................................................... 8
Table 9. LED and Status Outputs ............................................................................................................................ 9
Table 10. Clock and Chip Reset ............................................................................................................................ 10
Table 11. Power and Ground ................................................................................................................................. 10
Table 12. Symbol Code Scrambler ........................................................................................................................ 14
Table 13. Autonegotiation ...................................................................................................................................... 21