Texas Instruments TNETX4090 specifications Port trunking example, Extended port awareness

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TNETX4090

ThunderSWITCH II 9-PORT 100-/1000-MBIT/S ETHERNET SWITCH

SPWS044E ± DECEMBER 1997 ± REVISED AUGUST 1999

port trunking example

This example shows how to set up the TNETX4090 to support two port trunks. The first trunk group consists of ports 1, 3, 5, and 7 (see Table 21); the second trunk group consists of ports 0, 2, and 6 (see Table 22).

Table 21. Trunk Group 0 Port Membership (Trunk0Ports Register)

PORT

7	6	5	4	3	2	1	0

1	0	1	0	1	0	1	0

Table 22. Trunk Group 1 Port Membership (Trunk1Ports Register)

PORT

7	6	5	4	3	2	1	0

0	1	0	0	0	1	0	1

The TrunkMapx registers are used to control the distribution of traffic across the ports within a trunk group. In this example, the traffic for trunk group 0 has been equally distributed 25% (this assumes that bits 3±1 of the MAC addresses are random enough to give an even distribution) for each of the four ports in the trunk. For any given source and destination address pair, the traffic always uses the same port within the trunk. This ensures that packets do not get disordered on the trunk ports. Note that, since port 4 is not a member of any port trunk group, all the entries for this port have been set to 1. In fact, functionally, this can be thought of as a single port trunk.

Table 23. TrunkMapx Register Settings (for Traffic Distribution on Trunk Groups 0 and 1)

MAP				TRUNK PORT
INDEX	7	6	5	4	3	2	1	0
0	0	1	0	1	0	0	1	0
1	0	0	0	1	1	1	0	0
2	0	0	1	1	0	0	0	1
3	1	1	0	1	0	0	0	0
4	0	0	0	1	0	1	1	0
5	0	0	0	1	1	0	0	1
6	0	1	1	1	0	0	0	0
7	1	0	0	1	0	1	0	0

extended port awareness

When the port routing code is derived from an xportcode field, which has its most significant bit set (1xxxxx) indicating a port on an external crossbar matrix connected to port 8, the port-8 bit in the port routing code is set, and the five least significant bits of xportcode are used to create the pretag transmitted with the frame.

When bit 8 of the port routing code is set by a portvector field, the xroutecode field associated with the portvector is used to create the pretag transmitted with the frame (either directly if xroutecode is in the range 000000±010000, or indirectly via a lookup in the XMultiGroup17±XMulUGroup63 registers if xroutecode is in the range 010001±111111).

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Contents Description DMA MIIMAC MII MAC Eeprom CPU I/FPCS Duplex LED Rdram Interface Jtag Interface GGP Package Bottom View Signal Ball Name Signal-to-Ball Mapping Signal Names Sorted AlphabeticallyReset Sdma SAD0 Terminal Internal Description Name RESISTOR² Terminal FunctionsJtag interface Control logic interfaceM08TXD7 M08TXD6 M08TXD5 100-/1000-Mbit/s MAC interface Gmii modeTerminal Internal Description Name Resistor Port to not support pause frames Pulldown 10-/100-Mbit/s MAC interface MII mode ports 0±7M00RENEG M01RENEG M04TCLK M05TCLK M06TCLK M07TCLK AD4 ThunderSWITCH II 9-PORT 100-/1000-MBIT/S ETHERNET SwitchMII management interface Rdram interface Eeprom interface DIO interfaceLED interface Power supply100-/1000-Mbit/s port PCS LED interface DIO Internal Register Address Map DIO interface descriptionByte DIO Address TNETX4090 ThunderSWITCH II 9-PORT 100-/1000-MBIT/S ETHERNETVLAN1QID VLAN0QID VLAN37QID VLAN36QID TNETX4090 PCS8Status PCS8Control 0x0700 DIO interface description Tail Port StatisticsPort no Head Statistic Even ODD Ports 0x90Ex Port no Head Statistic TailReceiving/transmitting management frames DMA Interface SignalsSignal Description Address-Lookup StatisticsIeee Std 802.1Q Vlan tags on the NM port State of DIO signal terminals during hardware resetDIO Interface During Hardware Reset DIO Interface State During Hardware ResetCRC Vlan IDFCS Tpid TCITNETX4090 Interrupt processing PHY management interfaceFull-duplex NM port NM bandwidth and priorityMAC interface Receive versus transmit priority Adaptive performance optimization APOInterframe gap enforcement BackoffSpeed, duplex, and flow-control negotiation 10-/100-Mbit/s MII ports 0±7100-Mbit/s Port Negotiation With the TNETE2104 100-/1000-Mbit/s PHY interface port Outcome Port 8 Duplex Negotiation in MII ModePort 8 Pause Negotiation in MII Mode Full-duplex hardware flow controlPretag on transmission Pretagging and extended port awarenessM08GTCLK M08TXEN BIT Name Function Transmit Pretag Bit DefinitionsPretag on reception Learning Format Receive Pretag Bit DefinitionsTNETX4090 RXD Flow COL TXD Directed Format Receive Pretag Bit DefinitionsRing-cascade topology RXD Flow COL TXDRing-Topology Connectivity Switch TerminalM08GTCLK M08TXEN M08RXDV Edio TNETX4090 Eclk SCL SDAGND Interaction of Eeprom load with the SIO register Outcome Stop Load Initd ² Fault LED EclkSummary of Eeprom load outcomes State Display Compatibility with future device revisionsPort LED States Collision LED StatesMulti-LED display PCS duplex LEDLED Status Bit Definitions and Shift Order Lamp testSout SCHAIN0 Txclk Vref Rxclk VDD BUS Enable GND BUS Ctrl Rdram SINBUS Enable GND Rdram BUS Ctrl SIN TNETX4090 VCC NC Txclk Vref Rxclk VDDJtag Bist Status Jtag Instruction OpcodesHighz instruction Racbist instructionVlan support Frame routingIale Spanning-tree support Address maintenanceIeee Std 802.1Q tags ± reception Ieee Std 802.1Q header ± transmissionAging algorithms Frame-Routing Algorithm SPWS044E ± December 1997 ± Revised August Port routing code Removal of source port Port trunking/load sharingExtended port awareness Port trunking exampleTrunk Group 0 Port Membership Trunk0Ports Register Trunk Group 1 Port Membership Trunk1Ports RegisterFlow control System test capabilities Other flow-control mechanismsHardware flow control Multicast limitInternal wrap test Reading RdramPHY TNETX4090 Duplex wrap testMIN NOM MAX Unit Recommended operating conditionsReset see Figure Jtag interface Control signalsTiming requirements over recommended operating conditions PMA receive see Figure Physical medium attachment interface port ReceivePMA transmit see Figure TransmitGmii receive see Figure Gmii portGmii transmit see Figure Gmii Clock PMA and Gmii clock see FigureMII receive see Figure MII ports 0±8MII clock see Figure MII transmit see FigureDbusctrl Dbusen Rdram interfaceRdram see Figure Dtxclk DrxclkDIO and DMA writes see Figure DIO interfaceSCS Srnw SAD1±SAD0 Sdma SDATA7± SDATA0 Srdy Sint SCS Srnw SAD1±SAD0 Sdma SDATA7± SDATA0 Srdy DIO and DMA reads see FigureEeprom writes see Figure Eeprom interfaceEeprom reads see Figure LED see Figure LED interfaceLedclk Leddata VOL VOHTTL Output Macro Propagation-Delay-Time Voltage Waveforms 50% Lvcmos VDD VOHVOL VDD Mechanical Data TBD TNETX4090GGP Obsolete BGAImportant Notice