(LTX9883 / LTX9863) Advanced 10/100 Unmanaged Repeater

www.DataSheet4U.com Data Sheet - Preliminary Information MAY 2000 Revision 1.0 LXT9883/LXT9863 Advanced 10/100 Unmanaged Repeater General Description The LXT9883 is an advanced, 3.3V, 8-port 10/100 repeater. The LXT9883 is compatible with previous generations of Level One repeaters from the LXT980 and LXT918 families. Eight ports directly support 100BASETX/10BASE-T copper media. Two additional Media Independent Interface (MII) ports (10/100 Mbps selectable) connect to Media Access Controllers (MACs) for bridge/switch applications. The LXT9863 offers the same features and functionality in a six-port device. This data sheet uses the singular designation “LXT98x3” to refer to both devices. The LXT98x3 provides auto-negotiation with parallel detection for the PHY ports. The LXT98x3 provides two internal repeater state machines—one operating at 10 Mbps and one at 100 Mbps. Once configured, the LXT98x3 automatically connects each port to the appropriate repeater. The LXT98x3 also provides two Inter-Repeater Backplanes (IRBs) for expansion — one operating at 10 Mbps and one at 100 Mbps. Up to 240 twisted-pair and MII ports can logically be combined into one repeater. Features • Six or eight 10/100 ports with integrated twisted-pair PHYs including integrated filters. • Two 10/100 MIIs for bridging. • Independent operation. segments for 10 and 100 Mbps • Cascadable Inter-Repeater Backplanes (IRBs), with option for 5V stacking compatibility. • Integrated LED drivers with user-selectable modes. • Available in 208-pin QFP package. • Operating temperature range: 0-70°C, ambient. LXT98x3 Block Diagram 10M IRB 10 Mbps Backplane 10BASE-T Repeater 10/100 PHY 1 10/100 PHY 2 10/100 PHY 3 Port Switching Logic 10/100 PHY 4 10/100 PHY 5 10/100 PHY 6 10/100 PHY 7 10/100 PHY 8 TX_I/O TX_I/O TX_I/O TX_I/O TX_I/O TX_I/O TX_I/O TX_I/O 100M IRB 100 Mbps Backplane 100BASE-X Repeater Port & Mgmt Status Indicators Serial LED Drivers MII 1 MII 2 MII_I/O MII_I/O Refer to www.level1.com for most current information. ) www.DataSheet4U.com LXT9883/LXT9863 Advanced 10/100 Unmanaged Repeater TABLE OF CONTENTS Pin Assignments and Signal Descriptions .......... 3 Pin Assignments ................................................. 3 MII #1 Signal Descriptions .................................. 4 MII #2 Signal Descriptions .................................. 5 IRB Signal Descriptions ...................................... 6 Twisted-Pair Port Signal Descriptions............... 10 LED Signal Descriptions ................................... 11 Power Supply Signal Descriptions .................... 12 Miscellaneous Signal Descriptions ................... 14 Functional Description ........................................ 15 Introduction ....................................................... 15 Port Configuration............................................. 16 Auto-Negotiation ............................................... 16 Link Establishment and Port Connection .......... 16 MII Port Configuration ....................................... 16 Interface Descriptions....................................... 16 Twisted-Pair Interface ....................................... 16 Media Independent Interface (MII).................... 17 Repeater Operation ........................................... 18 100 Mbps Repeater Operation.......................... 18 10 Mbps Repeater Operation............................ 18 Requirements .................................................... 19 Power................................................................ 19 Clock ................................................................. 19 Bias Current ...................................................... 35 Reset ................................................................ 19 IRB Bus Pull-Ups .............................................. 19 LED Operation ................................................... 20 LEDs at Start-Up............................................... 20 Serial LEDs ....................................................... 20 LED Event Stretching ....................................... 20 Serial LED Interface.......................................... 20 Serial Shifting............................................... 20 Serial LED Signals....................................... 21 Activity Graph LEDs .....................................22 Direct Drive LEDs..............................................23 LED Modes .......................................................23 LED Mode 1 .................................................23 LED Mode 2 .................................................25 LED Mode 3 .................................................26 LED Mode 4 .................................................27 IRB Operation.....................................................28 MAC IRB Access.............................................. 28 LXT980 Device Compatibility ............................28 MII Port Operation..............................................31 Application Information .......................................32 General Design Guidelines ...............................32 Power and Ground ............................................32 Supply Filtering ............................................32 The RBIAS Pin.............................................34 MII Terminations................................................34 Twisted-Pair Interface .......................................35 Magnetics Information..................................35 LED Circuits ......................................................37 Direct Drive LEDs ........................................37 LEDs Multiplexed with Configuration Inputs 37 Serial Port LEDs ..........................................38 Inter-Repeater Backplane Compatibility..........39 Local Backplane - 3.3V Only.............................39 Stack Backplane - 3.3V or 5.0V ........................39 Test Specifications ...............................................42 Mechanical Specifications...................................55 2  www.DataSheet4U.com LXT9883/LXT9863 Pin Assignments and Signal Descriptions PIN ASSIGNMENTS AND SIGNAL DESCRIPTIONS Figure 1: LXT9883 Pin Assignments 52 ........N/C 51 ........N/C 50 ........IR100CLK 49 ........IR100DAT4 48 ........IR100DAT3 47 ........VCC 46 ........GND 45 ........IR100DAT2 44 ........IR100DAT1 43 ........IR100DAT0 42 ........ IR100DV 41 ........ IR100DEN 40 ........ IR100COL 39 ........COMP_SEL 38 ........ IR100SNGL 37 ........ IR100CFSBP 36 ........ IR100CFS 35 ........MII1_RXD3 34 ........MII1_RXD2 33 ........N/C 32 .......MII1_RXD1 31 ........MII1_RXD0 30 ........MII1_RXDV 29 ........MII1_RXCLK 28 ........VCC 27 ........GND 26 ........MII1_RXER 25 ........N/C 24 ........MII1_TXER 23 ........MII1_TXCLK 22 ........MII1_TXEN 21 ........MII1_TXD0 20 ........MII1_TXD1 19 ........MII1_TXD2 18 ........MII2_SPD 17 ........MII1_TXD3 16 ........VCC 15 ........GND 14 ........MII1_COL 13 ........MII1_CRS 12 ........IR10CLK 11 ........IR10DAT 10 ........ IR10ENA 9 ..........MII1_SPD 8 ..........VCC 7 .......... GND 6 .......... IR10DEN 5 .......... IR10CFSBP 4 .......... IR10COLBP 3 .......... IR10COL 2 .......... IR10CFS 1 .......... GND RESET ..... 53 CLK25 ..... 54 N/C ..... 55 N/C ..... 56 N/C ..... 57 N/C ..... 58 N/C ..... 59 N/C ..... 60 VCC ..... 61 GND ..... 62 N/C ..... 63 N/C ..... 64 N/C ..... 65 N/C ..... 66 N/C ..... 67 N/C ..... 68 N/C ..... 69 N/C ..... 70 N/C ..... 71 FPS ..... 72 N/C ..... 73 VCC ..... 74 GND ..... 75 VCC ..... 76 VCC ..... 77 RPS_FAULT ..... 78 RPS_PRES ..... 79 MACACTIVE ..... 80 HOLDCOL ..... 81 LEDCLK ..... 82 LEDDAT ..... 83 LEDLAT ..... 84 VCC ..... 85 GND ..... 86 PORT1_LED3 ..... 87 PORT1_LED2 ..... 88 PORT1_LED1 ..... 89 GND ..... 90 PORT2_LED3 ..... 91 PORT2_LED2 ..... 92 PORT2_LED1 ..... 93 GND ..... 94 PORT3_LED3 ..... 95 PORT3_LED2 ..... 96 PORT3_LED1 ..... 97 GND ..... 98 PORT4_LED3 ..... 99 PORT4_LED2 ..... 100 PORT4_LED1 ..... 101 RBIAS ..... 102 GND ..... 103 TPIP1 ..... 104 LXT98x3 208..... MII2_RXD3 207..... MII2_RXD2 206..... MII2_RXD1 205..... MII2_RXD0 204..... MII2_RXDV 203..... MII2_RXCLK 202..... MII2_RXER 201..... N/C 200..... VCC 199..... GND 198..... N/C 197..... MII2_TXER 196..... MII2_TXCLK 195..... MII2_TXEN 194..... MII2_TXD0 193..... MII2_TXD1 192..... MII2_TXD2 191..... MII2_TXD3 190..... VCC 189..... GND 188..... MII2_COL 187..... MII2_CRS 186..... COL100_LED 185..... LEDSEL1/COL10_LED 184..... LEDSEL0/ACT100_LED 183..... AUTOBLINK/ACT10_LED 182..... N/C 181..... GND 180..... VCC 179..... GND 178..... N/C 177..... VCC 176..... PORT8_LED1* 175..... PORT8_LED2*/LEDABGSEL 174..... PORT8_LED3* 173..... VCC 172..... GND 171..... PORT7_LED1* 170..... PORT7_LED2* 169..... PORT7_LED3* 168..... GND 167..... PORT6_LED1 166..... PORT6_LED2 165..... PORT6_LED3 164..... GND 163..... PORT5_LED1 162..... PORT5_LED2 161..... PORT5_LED3 160..... TxSLEW_1 159..... TxSLEW_0 158..... GND 157..... *TPIP8 *TPIP7..... *TPIN7..... * Indicates LXT9883-only pins. TP Ports 7 and 8 are not available on LXT9863 devices.  *TPOP7..... *TPON7..... *TPON8..... *TPOP8..... *TPIN8..... TPIN1 ..... 105 VCCR ..... 106 TPOP1 ..... 107 TPON1 ..... 108 GND ..... 109 TPON2 ..... 110 TPOP2 ..... 111 VCCT ..... 112 VCCR ..... 113 TPIN2 ..... 114 TPIP2 ..... 115 GND ..... 116 GND ..... 117 TPIP3 ..... 118 TPIN3 ..... 119 VCCR ..... 120 TPOP3 ..... 121 TPON3 ..... 122 GND ..... 123 TPON4 ..... 124 TPOP4 ..... 125 VCCT ..... 126 VCCR ..... 127 TPIN4 ..... 128 TPIP4 ..... 129 GND ..... 130 GND ..... 131 TPIP5 ..... 132 TPIN5 ..... 133 VCCR ..... 134 VCCT ..... 135 TPOP5 ..... 136 TPON5 ..... 137 GND ..... 138 TPON6 ..... 139 TPOP6 ..... 140 VCCR ..... 141 TPIN6 ..... 142 TPIP6 ..... 143 GND ..... 144 GND ..... 145 146 147 VCCR ..... 148 VCCT ..... 149 150 151 GND ..... 152 153 154 VCCR ..... 155 156 3 www.DataSheet4U.com LXT9883/LXT9863 Advanced 10/100 Unmanaged Repeater Tab