LXT9785 datasheet(7/244 Pages) ETC2

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Cortina Systems® LXT9785 and LXT9785E Advanced 8-Port 10/100 Mbps PHY Transceivers

LXT9785/LXT9785E

Datasheet

249241, Revision 12.0

04 November 2011

Figures

Block Diagram ............................................................................................................................... 20

RMII 208-Pin PQFP Assignments ................................................................................................. 22

SMII 208-Pin PQFP Assignments ................................................................................................. 29

SS-SMII 208-Pin PQFP Assignments ........................................................................................... 36

241-Ball BGA23 Assignments (Top View)..................................................................................... 58

196-Ball BGA15 Assignments (Top View)................................................................................... 120

Interface Signals.......................................................................................................................... 141

Internal Loopback ........................................................................................................................ 143

Management Interface Read Frame Structure ............................................................................ 145

Management Interface Write Frame Structure ............................................................................ 145

Port Address Scheme.................................................................................................................. 146

Interrupt Logic.............................................................................................................................. 147

Initialization Sequence................................................................................................................. 150

Auto-Negotiation Operation ......................................................................................................... 154

Typical SMII Interface.................................................................................................................. 155

Typical SMII Quad Sectionalization............................................................................................. 156

100 Mbps Serial MII Data Flow ................................................................................................... 157

Serial MII Transmit Synchronization............................................................................................ 157

Serial MII Receive Synchronization............................................................................................. 158

Typical SS-SMII Interface............................................................................................................ 160

Typical SS-SMII Quad Sectionalization....................................................................................... 161

SS-SMII Transmit Timing ............................................................................................................ 162

SS-SMII Receive Timing ............................................................................................................. 162

RMII Data Flow............................................................................................................................ 163

Typical RMII Interface.................................................................................................................. 164

Typical RMII Quad Sectionalization............................................................................................. 165

100BASE-X Frame Format.......................................................................................................... 166

Protocol Sublayers ...................................................................................................................... 167

Typical IP Telephone System Connection................................................................................... 172

Cortina Systems® LXT9785E Negotiation Flow Chart................................................................. 177

LED Pulse Stretching .................................................................................................................. 179

RMII Programmable Out-of-Band Signaling ................................................................................ 179

LED Circuit .................................................................................................................................. 188

Power and Ground Supply Connections ..................................................................................... 189

Typical Twisted-Pair Interface ..................................................................................................... 190

Recommended LXT9785/LXT9785E-to-3.3 V Fiber Transceiver Interface Circuitry................... 191

Recommended LXT9785/LXT9785E-to-5 V Fiber Transceiver Interface Circuitry...................... 192

ON Semiconductor Triple PECL-to-LVPECL Translator ............................................................. 193

SMII - 100BASE-TX Receive Timing........................................................................................... 198

SMII - 100BASE-TX Transmit Timing.......................................................................................... 199

SMII - 100BASE-FX Receive Timing........................................................................................... 200

SMII - 100BASE-FX Transmit Timing.......................................................................................... 200

SMII - 10BASE-T Receive Timing ............................................................................................... 201

SMII - 10BASE-T Transmit Timing .............................................................................................. 202

SS-SMII - 100BASE-TX Receive Timing..................................................................................... 203

SS-SMII - 100BASE-TX Transmit Timing.................................................................................... 203

SS-SMII - 100BASE-FX Receive Timing..................................................................................... 204

SS-SMII - 100BASE-FX Transmit Timing.................................................................................... 205

SS-SMII - 10BASE-T Receive Timing ......................................................................................... 205

SS-SMII - 10BASE-T Transmit Timing ........................................................................................ 206

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