lxt975 Intel Corporation, lxt975 Datasheet - Page 3

• Manufacturer Part Number: lxt975
• Description: Fast Ethernet 10/100 Quad Transceivers
• Manufacturer: Intel Corporation

Contents
1.0
2.0
Datasheet
Pin Assignments and Signal Descriptions
Functional Description
2.1
2.2
2.3
2.4
2.5
2.6
2.7
Introduction..........................................................................................................19
Network Media / Protocol Support.......................................................................20
2.2.1
2.2.2
2.2.3
Initialization..........................................................................................................27
2.3.1
2.3.2
2.3.3
Auto-Negotiation..................................................................................................29
2.4.1
2.4.2
2.4.3
100 Mbps Operation............................................................................................30
2.5.1
2.5.2
2.5.3
2.5.4
2.5.5
2.5.6
2.5.7
10 Mbps Operation..............................................................................................36
2.6.1
2.6.2
LED Functions.....................................................................................................37
2.7.1
10/100 Mbps Network Interface .............................................................20
2.2.1.1 Twisted-Pair Interface ...............................................................20
2.2.1.2 Fiber Interface ...........................................................................21
MII Interface ...........................................................................................21
2.2.2.1 MII Data Interface......................................................................21
2.2.2.2 MII Management Interface ........................................................24
Hardware Control Interface ....................................................................25
MDIO Control Mode ...............................................................................27
Manual Control Mode .............................................................................27
Link Configuration ..................................................................................28
Parallel Detection ...................................................................................29
Controlling Auto-Negotiation ..................................................................29
Monitoring Auto-Negotiation...................................................................29
100BASE-X MII Operations....................................................................30
100BASE-X Network Operations ...........................................................30
100BASE-X Protocol Sublayer Operations ............................................33
PCS Sublayer .........................................................................................33
2.5.4.1 Preamble Handling ....................................................................33
2.5.4.2 Data Errors ................................................................................34
2.5.4.3 Collision Indication ....................................................................34
PMA Sublayer ........................................................................................35
2.5.5.1 Link ............................................................................................35
2.5.5.2 Link Failure Override .................................................................35
2.5.5.3 Carrier Sense (CRS) .................................................................35
Twisted-Pair PMD Sublayer ...................................................................35
2.5.6.1 Scrambler/Descrambler (100TX Only) ......................................35
2.5.6.2 Baseline Wander Correction .....................................................36
2.5.6.3 Polarity Correction .....................................................................36
Fiber PMD Sublayer ...............................................................................36
10BASE-T MII Operation........................................................................36
10BASE-T Network Operations..............................................................36
2.6.2.1 Preamble Handling ....................................................................37
2.6.2.2 Link Test....................................................................................37
2.6.2.3 Link Failure ................................................................................37
2.6.2.4 SQE (Heartbeat)........................................................................37
2.6.2.5 Jabber .......................................................................................37
Serial LED Output ..................................................................................38
Fast Ethernet 10/100 Quad Transceivers — LXT974/LXT975
...........................................................................................19
....................................................10
3